OV7670_ULX3S.ice

{
  "version": "1.2",
  "package": {
    "name": "asyn_fifo",
    "version": "",
    "description": "fifo with different read/write clock domains",
    "author": "",
    "image": ""
  },
  "design": {
    "board": "ulx3s-85f",
    "graph": {
      "blocks": [
        {
          "id": "b0cfb266-2cee-4123-90ca-206363832d6d",
          "type": "basic.input",
          "data": {
            "name": "clk",
            "pins": [
              {
                "index": "0",
                "name": "clk",
                "value": "G2"
              }
            ],
            "virtual": false,
            "clock": true
          },
          "position": {
            "x": -560,
            "y": 232
          }
        },
        {
          "id": "5cd882ad-4ef9-4297-a0eb-84f4e07be82d",
          "type": "basic.input",
          "data": {
            "name": "rst_n",
            "pins": [
              {
                "index": "0",
                "name": "btn_0",
                "value": "D6"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -560,
            "y": 336
          }
        },
        {
          "id": "042cec0e-560c-4b58-a291-808c22891e69",
          "type": "basic.output",
          "data": {
            "name": "sdram_clk",
            "pins": [
              {
                "index": "0",
                "name": "sdram_clk",
                "value": "F19"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 488,
            "y": 424
          }
        },
        {
          "id": "30912745-d291-4c12-9cb7-aa0b05ecc83b",
          "type": "basic.output",
          "data": {
            "name": "gpdi_dp",
            "range": "[3:0]",
            "pins": [
              {
                "index": "3",
                "name": "gpdi_dp3",
                "value": "A17"
              },
              {
                "index": "2",
                "name": "gpdi_dp2",
                "value": "A12"
              },
              {
                "index": "1",
                "name": "gpdi_dp1",
                "value": "A14"
              },
              {
                "index": "0",
                "name": "gpdi_dp0",
                "value": "A16"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 1016,
            "y": 480
          }
        },
        {
          "id": "f762095b-6d91-44f6-b1bc-b82660253c4e",
          "type": "basic.output",
          "data": {
            "name": "sdram_cke",
            "pins": [
              {
                "index": "0",
                "name": "sdram_cke",
                "value": "F20"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 488,
            "y": 488
          }
        },
        {
          "id": "4cd0288d-6ae3-4e2d-9a07-64dc5c6ba911",
          "type": "basic.output",
          "data": {
            "name": "sdram_cs_n",
            "pins": [
              {
                "index": "0",
                "name": "sdram_csn",
                "value": "P20"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 488,
            "y": 552
          }
        },
        {
          "id": "761db717-8e7f-488d-8bd0-08bb1fd3e15d",
          "type": "basic.output",
          "data": {
            "name": "sdram_ras_n",
            "pins": [
              {
                "index": "0",
                "name": "sdram_rasn",
                "value": "R20"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 488,
            "y": 616
          }
        },
        {
          "id": "99e165d3-0492-4adb-864b-0488df1da888",
          "type": "basic.input",
          "data": {
            "name": "inc_bright",
            "pins": [
              {
                "index": "0",
                "name": "btn_3",
                "value": "R18"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -520,
            "y": 680
          }
        },
        {
          "id": "19ef3a82-66be-492a-b87b-25d6039fd308",
          "type": "basic.output",
          "data": {
            "name": "sdram_cas_n",
            "pins": [
              {
                "index": "0",
                "name": "sdram_casn",
                "value": "T19"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 488,
            "y": 680
          }
        },
        {
          "id": "45a9a368-5852-489b-931d-edc3a5e81bc5",
          "type": "basic.output",
          "data": {
            "name": "led",
            "range": "[7:0]",
            "pins": [
              {
                "index": "7",
                "name": "led_7",
                "value": "H3"
              },
              {
                "index": "6",
                "name": "led_6",
                "value": "E1"
              },
              {
                "index": "5",
                "name": "led_5",
                "value": "E2"
              },
              {
                "index": "4",
                "name": "led_4",
                "value": "D1"
              },
              {
                "index": "3",
                "name": "led_3",
                "value": "D2"
              },
              {
                "index": "2",
                "name": "led_2",
                "value": "C1"
              },
              {
                "index": "1",
                "name": "led_1",
                "value": "C2"
              },
              {
                "index": "0",
                "name": "led_0",
                "value": "B2"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 64,
            "y": 680
          }
        },
        {
          "id": "78f41e24-b679-4e3e-b49f-0f4d9479cc72",
          "type": "basic.input",
          "data": {
            "name": "dec_brightness",
            "pins": [
              {
                "index": "0",
                "name": "btn_4",
                "value": "V1"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -408,
            "y": 712
          }
        },
        {
          "id": "d0301c8e-c0a0-4ccf-92f6-5e03e9234218",
          "type": "basic.input",
          "data": {
            "name": "dec_contrast",
            "pins": [
              {
                "index": "0",
                "name": "btn_6",
                "value": "H16"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -520,
            "y": 744
          }
        },
        {
          "id": "3181131d-e0e3-4548-ba02-e039e7fbd72f",
          "type": "basic.output",
          "data": {
            "name": "sdram_we_n",
            "pins": [
              {
                "index": "0",
                "name": "sdram_wen",
                "value": "T20"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 488,
            "y": 744
          }
        },
        {
          "id": "a6475999-6650-4f56-9811-fcebf96d560c",
          "type": "basic.input",
          "data": {
            "name": "inc_constrast",
            "pins": [
              {
                "index": "0",
                "name": "btn_5",
                "value": "U1"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -408,
            "y": 776
          }
        },
        {
          "id": "91eabd24-11ac-4671-a6c0-d9d3e08873cf",
          "type": "basic.input",
          "data": {
            "name": "cmos_pclk",
            "pins": [
              {
                "index": "0",
                "name": "gp16",
                "value": "N16"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -424,
            "y": 888
          }
        },
        {
          "id": "8b559e11-15a1-4ffc-aaa9-7347e629b7d8",
          "type": "basic.output",
          "data": {
            "name": "sdram_addr",
            "range": "[12:0]",
            "pins": [
              {
                "index": "12",
                "name": "sdram_a12",
                "value": "G19"
              },
              {
                "index": "11",
                "name": "sdram_a11",
                "value": "G20"
              },
              {
                "index": "10",
                "name": "sdram_a10",
                "value": "N19"
              },
              {
                "index": "9",
                "name": "sdram_a9",
                "value": "H20"
              },
              {
                "index": "8",
                "name": "sdram_a8",
                "value": "J19"
              },
              {
                "index": "7",
                "name": "sdram_a7",
                "value": "J20"
              },
              {
                "index": "6",
                "name": "sdram_a6",
                "value": "K18"
              },
              {
                "index": "5",
                "name": "sdram_a5",
                "value": "K19"
              },
              {
                "index": "4",
                "name": "sdram_a4",
                "value": "K20"
              },
              {
                "index": "3",
                "name": "sdram_a3",
                "value": "L19"
              },
              {
                "index": "2",
                "name": "sdram_a2",
                "value": "L20"
              },
              {
                "index": "1",
                "name": "sdram_a1",
                "value": "M19"
              },
              {
                "index": "0",
                "name": "sdram_a0",
                "value": "M20"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 496,
            "y": 912
          }
        },
        {
          "id": "a955dcb5-6333-48bb-8a2a-ef260096e79b",
          "type": "basic.output",
          "data": {
            "name": "sdram_dq",
            "range": "[15:0]",
            "pins": [
              {
                "index": "15",
                "name": "sdram_d15",
                "value": "J17"
              },
              {
                "index": "14",
                "name": "sdram_d14",
                "value": "J18"
              },
              {
                "index": "13",
                "name": "sdram_d13",
                "value": "F18"
              },
              {
                "index": "12",
                "name": "sdram_d12",
                "value": "E18"
              },
              {
                "index": "11",
                "name": "sdram_d11",
                "value": "C20"
              },
              {
                "index": "10",
                "name": "sdram_d10",
                "value": "D19"
              },
              {
                "index": "9",
                "name": "sdram_d9",
                "value": "D20"
              },
              {
                "index": "8",
                "name": "sdram_d8",
                "value": "E19"
              },
              {
                "index": "7",
                "name": "sdram_d7",
                "value": "U20"
              },
              {
                "index": "6",
                "name": "sdram_d6",
                "value": "T17"
              },
              {
                "index": "5",
                "name": "sdram_d5",
                "value": "T18"
              },
              {
                "index": "4",
                "name": "sdram_d4",
                "value": "P18"
              },
              {
                "index": "3",
                "name": "sdram_d3",
                "value": "N18"
              },
              {
                "index": "2",
                "name": "sdram_d2",
                "value": "M18"
              },
              {
                "index": "1",
                "name": "sdram_d1",
                "value": "L18"
              },
              {
                "index": "0",
                "name": "sdram_d0",
                "value": "J16"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 360,
            "y": 912
          }
        },
        {
          "id": "a066f430-c210-4c31-9d7f-428b9bde3f48",
          "type": "basic.input",
          "data": {
            "name": "cmos_href",
            "pins": [
              {
                "index": "0",
                "name": "gp15",
                "value": "N17"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -424,
            "y": 952
          }
        },
        {
          "id": "71318d71-0e9d-4687-aa86-1a59cb476325",
          "type": "basic.input",
          "data": {
            "name": "cmos_vsync",
            "pins": [
              {
                "index": "0",
                "name": "gn15",
                "value": "P16"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -424,
            "y": 1016
          }
        },
        {
          "id": "2e7e030c-646e-4ad0-afdc-b2f53fb5bb52",
          "type": "basic.output",
          "data": {
            "name": "cmos_rst_n",
            "pins": [
              {
                "index": "0",
                "name": "gn17",
                "value": "L17"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 64,
            "y": 1024
          }
        },
        {
          "id": "38c89905-5350-4d31-a430-97746d5cb997",
          "type": "basic.input",
          "data": {
            "name": "cmos_db",
            "range": "[7:0]",
            "pins": [
              {
                "index": "7",
                "name": "gn21",
                "value": "D17"
              },
              {
                "index": "6",
                "name": "gp21",
                "value": "C18"
              },
              {
                "index": "5",
                "name": "gn22",
                "value": "C15"
              },
              {
                "index": "4",
                "name": "gp22",
                "value": "B15"
              },
              {
                "index": "3",
                "name": "gn23",
                "value": "C17"
              },
              {
                "index": "2",
                "name": "gp23",
                "value": "B17"
              },
              {
                "index": "1",
                "name": "gn24",
                "value": "D16"
              },
              {
                "index": "0",
                "name": "gp24",
                "value": "C16"
              }
            ],
            "virtual": false,
            "clock": false
          },
          "position": {
            "x": -424,
            "y": 1080
          }
        },
        {
          "id": "e3181512-8c9e-4dfa-ba1d-ba5d401c494b",
          "type": "basic.output",
          "data": {
            "name": "cmos_pwdn",
            "pins": [
              {
                "index": "0",
                "name": "gp17",
                "value": "L16"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 64,
            "y": 1088
          }
        },
        {
          "id": "5a24a1ab-b4d9-417c-9265-93ba80f04622",
          "type": "basic.output",
          "data": {
            "name": "cmos_xclk",
            "pins": [
              {
                "index": "0",
                "name": "gn16",
                "value": "M17"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 64,
            "y": 1152
          }
        },
        {
          "id": "7f17b52c-dfa4-4b2b-bb55-82bacebe80ab",
          "type": "basic.output",
          "data": {
            "name": "cmos_scl",
            "pins": [
              {
                "index": "0",
                "name": "gn14",
                "value": "U17"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 64,
            "y": 1216
          }
        },
        {
          "id": "67d175ae-ac04-4af4-a0ad-b52e580854fe",
          "type": "basic.output",
          "data": {
            "name": "cmos_sda",
            "pins": [
              {
                "index": "0",
                "name": "gp14",
                "value": "U18"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 64,
            "y": 1280
          }
        },
        {
          "id": "b5753516-9140-43cf-8cf8-9793ffde5391",
          "type": "basic.output",
          "data": {
            "name": "sdram_ba",
            "range": "[1:0]",
            "pins": [
              {
                "index": "1",
                "name": "sdram_ba1",
                "value": "N20"
              },
              {
                "index": "0",
                "name": "sdram_ba0",
                "value": "P19"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 488,
            "y": 1408
          }
        },
        {
          "id": "d5de4d9b-5610-461a-9f4a-f75de076c95f",
          "type": "basic.output",
          "data": {
            "name": "sdram_dqm",
            "range": "[1:0]",
            "pins": [
              {
                "index": "1",
                "name": "sdram_dqm1",
                "value": "E20"
              },
              {
                "index": "0",
                "name": "sdram_dqm0",
                "value": "U19"
              }
            ],
            "virtual": false
          },
          "position": {
            "x": 496,
            "y": 1544
          }
        },
        {
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            "y": 232
          },
          "size": {
            "width": 96,
            "height": 64
          }
        },
        {
          "id": "d1880b00-8808-4d1e-9a9b-9cd0342f8cc5",
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            "y": 440
          },
          "size": {
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            "height": 384
          }
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            "height": 128
          }
        },
        {
          "id": "cc560125-68e0-43e2-9b88-ae3dce7c3c8b",
          "type": "basic.info",
          "data": {
            "info": "![OV7670_ULX3S](https://user-images.githubusercontent.com/87559347/139229796-e3072ac5-d99b-4360-b7b1-47e7d0e19e40.jpg)   \n\n\n\n\n",
            "readonly": true
          },
          "position": {
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            "y": 608
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          "size": {
            "width": 1024,
            "height": 512
          }
        },
        {
          "id": "b17e21e1-ddab-49e4-bd84-668133db05e5",
          "type": "basic.info",
          "data": {
            "info": "## Created by: Angelo C. Jacobo (https://www.linkedin.com/in/angelo-jacobo/)  \n\n### The OV7670 camera is a 0.3 Megapixel camera(640x480 @ 30fps). Data pixels are stored to SDRAM and retrieved by the HDMI which will then be displayed on the monitor.  \n### * `btn3` - increase brightness\n### * `btn4` - decrease brightness\n### * `btn6` - increase contrast\n### * `btn5` - decrease contrast",
            "readonly": true
          },
          "position": {
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            "y": 256
          },
          "size": {
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            "height": 312
          }
        }
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      "wires": [
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        "description": "Converts 25MHz input clk to 100MHz",
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        "description": "communicates with OV7670 and set register configurations",
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                "list": "16'h12_80;  //reset all register to default values\r\n16'h12_04;  //set output format to RGB\r\n16'h15_20;  //pclk will not toggle during horizontal blank\r\n16'h40_d0;\t//RGB565\r\n16'h12_04; // COM7,     set RGB color output\r\n16'h11_80; // CLKRC     internal PLL matches input clock\r\n16'h0C_00; // COM3,     default settings\r\n16'h3E_00; // COM14,    no scaling, normal pclock\r\n16'h04_00; // COM1,     disable CCIR656\r\n16'h40_d0; //COM15,     RGB565, full output range\r\n16'h3a_04; //TSLB       set correct output data sequence (magic)\r\n16'h14_18; //COM9       MAX AGC value x4 0001_1000\r\n16'h4F_B3; //MTX1       all of these are magical matrix coefficients\r\n16'h50_B3; //MTX2\r\n16'h51_00; //MTX3\r\n16'h52_3d; //MTX4\r\n16'h53_A7; //MTX5\r\n16'h54_E4; //MTX6\r\n16'h58_9E; //MTXS\r\n16'h3D_C0; //COM13      sets gamma enable, does not preserve reserved bits, may be wrong?\r\n16'h17_14; //HSTART     start high 8 bits\r\n16'h18_02; //HSTOP      stop high 8 bits //these kill the odd colored line\r\n16'h32_80; //HREF       edge offset\r\n16'h19_03; //VSTART     start high 8 bits\r\n16'h1A_7B; //VSTOP      stop high 8 bits\r\n16'h03_0A; //VREF       vsync edge offset\r\n16'h0F_41; //COM6       reset timings\r\n16'h1E_00; //MVFP       disable mirror / flip //might have magic value of 03\r\n16'h33_0B; //CHLF       //magic value from the internet\r\n16'h3C_78; //COM12      no HREF when VSYNC low\r\n16'h69_00; //GFIX       fix gain control\r\n16'h74_00; //REG74      Digital gain control\r\n16'hB0_84; //RSVD       magic value from the internet *required* for good color\r\n16'hB1_0c; //ABLC1\r\n16'hB2_0e; //RSVD       more magic internet values\r\n16'hB3_80; //THL_ST\r\n16'h70_3a;\r\n16'h71_35;\r\n16'h72_11;\r\n16'h73_f0;\r\n16'ha2_02;\r\n16'h7a_20;\r\n16'h7b_10;\r\n16'h7c_1e;\r\n16'h7d_35;\r\n16'h7e_5a;\r\n16'h7f_69;\r\n16'h80_76;\r\n16'h81_80;\r\n16'h82_88;\r\n16'h83_8f;\r\n16'h84_96;\r\n16'h85_a3;\r\n16'h86_af;\r\n16'h87_c4;\r\n16'h88_d7;\r\n16'h89_e8;\r\n16'h13_e0; //COM8, disable AGC / AEC\r\n16'h00_00; //set gain reg to 0 for AGC\r\n16'h10_00; //set ARCJ reg to 0\r\n16'h0d_40; //magic reserved bit for COM4\r\n16'h14_18; //COM9, 4x gain + magic bit\r\n16'ha5_05; // BD50MAX\r\n16'hab_07; //DB60MAX\r\n16'h24_95; //AGC upper limit\r\n16'h25_33; //AGC lower limit\r\n16'h26_e3; //AGC/AEC fast mode op region\r\n16'h9f_78; //HAECC1\r\n16'ha0_68; //HAECC2\r\n16'ha1_03; //magic\r\n16'ha6_d8; //HAECC3\r\n16'ha7_d8; //HAECC4\r\n16'ha8_f0; //HAECC5\r\n16'ha9_90; //HAECC6\r\n16'haa_94; //HAECC7\r\n16'h13_e5; //COM8, enable AGC / AEC\r\n16'h1E_23; //Mirror Image\r\n16'h69_06; //gain of RGB(manually adjusted)",
                "local": true,
                "format": 10
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              "id": "4b0055df-4e41-45a2-9655-406edc6b891c",
              "type": "basic.code",
              "data": {
                "code": "\t //FSM state declarations\r\n\t localparam idle=0,\r\n\t\t\t\t\tstart_sccb=1,\r\n\t\t\t\t\twrite_address=2,\r\n\t\t\t\t\twrite_data=3,\r\n\t\t\t\t\tdigest_loop=4,\r\n\t\t\t\t\tdelay=5,\r\n\t\t\t\t\tvsync_fedge=6,\r\n\t\t\t\t\tbyte1=7,\r\n\t\t\t\t\tbyte2=8,\r\n\t\t\t\t\tfifo_write=9,\r\n\t\t\t\t\tstopping=10;\r\n\t\t\t\t\t\r\n\t localparam wait_init=0,\r\n\t\t\t\t\tsccb_idle=1,\r\n\t\t\t\t\tsccb_address=2,\r\n\t\t\t\t\tsccb_data=3,\r\n\t\t\t\t\tsccb_stop=4;\r\n\t\t\t\t\t\r\n\t localparam MSG_INDEX=77; //number of the last index to be digested by SCCB\r\n\t \r\n\t \r\n\t \r\n\t reg[3:0] state_q=0,state_d;\r\n\t reg[2:0] sccb_state_q=0,sccb_state_d;\r\n\t reg[7:0] addr_q,addr_d;\r\n\t reg[7:0] data_q,data_d;\r\n\t reg[7:0] brightness_q,brightness_d;\r\n\t reg[7:0] contrast_q,contrast_d;\r\n\t reg start,stop;\r\n\t reg[7:0] wr_data;\r\n\t reg[7:0] led_q=0,led_d; \r\n\t reg[27:0] delay_q=0,delay_d;\r\n\t reg start_delay_q=0,start_delay_d;\r\n\t reg delay_finish;\r\n\t reg[20:0] message[250:0];\r\n\t reg[7:0] message_index_q=0,message_index_d;\r\n\t reg[15:0] pixel_q,pixel_d;\r\n\t reg wr_en;\r\n\t reg key0_tick,key1_tick,key2_tick,key3_tick;\r\n\t reg key0_prev,key1_prev,key2_prev,key3_prev;\r\n\t \r\n\t wire rd_tick;\r\n\t wire[7:0] rd_data;\r\n\t wire full;\r\n\t \r\n\t //buffer for all inputs coming from the camera\r\n\t reg pclk_1,pclk_2,href_1,href_2,vsync_1,vsync_2;\r\n\t \r\n     initial begin  //read all register configuration values\r\n        if(DATA) $readmemh(DATA,message);\r\n     end\r\n    \r\n\t \r\n\t //register operations\r\n\t always @(posedge clk_100,negedge rst_n) begin\r\n\t\tif(!rst_n) begin\r\n\t\t\tstate_q<=0;\r\n\t\t\tled_q<=0;\r\n\t\t\tdelay_q<=0;\r\n\t\t\tstart_delay_q<=0;\r\n\t\t\tmessage_index_q<=0;\r\n\t\t\tpixel_q<=0;\r\n\t\t\t\r\n\t\t\tsccb_state_q<=0;\r\n\t\t\taddr_q<=0;\r\n\t\t\tdata_q<=0;\r\n\t\t\tbrightness_q<=0;\r\n\t\t\tcontrast_q<=0;\r\n\t\tend\r\n\t\telse begin\r\n\t\t\tstate_q<=state_d;\r\n\t\t\tled_q<=led_d;\r\n\t\t\tdelay_q<=delay_d;\r\n\t\t\tstart_delay_q<=start_delay_d;\r\n\t\t\tmessage_index_q<=message_index_d;\t\t\t\r\n\t\t\tpclk_1<=cmos_pclk; \r\n\t\t\tpclk_2<=pclk_1;\r\n\t\t\thref_1<=cmos_href;\r\n\t\t\thref_2<=href_1;\r\n\t\t\tvsync_1<=cmos_vsync;\r\n\t\t\tvsync_2<=vsync_1;\r\n\t\t\tpixel_q<=pixel_d;\r\n\t\t\t\r\n\t\t\tsccb_state_q<=sccb_state_d;\r\n\t\t\taddr_q<=addr_d;\r\n\t\t\tdata_q<=data_d;\r\n\t\t\tbrightness_q<=brightness_d;\r\n\t\t\tcontrast_q<=contrast_d;\r\n\t\tend\r\n\t end\r\n\t \t \r\n\t \r\n\t //FSM next-state logics\r\n\t always @* begin\r\n\t\tstate_d=state_q;\r\n\t\tled_d=led_q;\r\n\t\tstart=0;\r\n\t\tstop=0;\r\n\t\twr_data=0;\r\n\t\tstart_delay_d=start_delay_q;\r\n\t\tdelay_d=delay_q;\r\n\t\tdelay_finish=0;\r\n\t\tmessage_index_d=message_index_q;\r\n\t\tpixel_d=pixel_q;\r\n\t\twr_en=0;\r\n\t\t\r\n\t\tsccb_state_d=sccb_state_q;\r\n\t\taddr_d=addr_q;\r\n\t\tdata_d=data_q;\r\n\t\tbrightness_d=brightness_q;\r\n\t\tcontrast_d=contrast_q;\r\n\t\t\r\n\t\t//delay logic  \r\n\t\tif(start_delay_q) delay_d=delay_q+1'b1;\r\n\t\tif(delay_q[16] && message_index_q!=(MSG_INDEX+1) && (state_q!=start_sccb))  begin  //delay between SCCB transmissions (0.66ms)\r\n\t\t\tdelay_finish=1;\r\n\t\t\tstart_delay_d=0;\r\n\t\t\tdelay_d=0;\r\n\t\tend\r\n\t\telse if((delay_q[26] && message_index_q==(MSG_INDEX+1)) || (delay_q[26] && state_q==start_sccb)) begin //delay BEFORE SCCB transmission, AFTER SCCB transmission, and BEFORE retrieving pixel data from camera (0.67s)\r\n\t\t\tdelay_finish=1;\r\n\t\t\tstart_delay_d=0;\r\n\t\t\tdelay_d=0;\r\n\t\tend\r\n\t\t\r\n\t\tcase(state_q) \r\n\t\t\r\n\t\t\t\t\t////////Begin: Setting register values of the camera via SCCB///////////\r\n\t\t\t\t\t\r\n\t\t\t  idle:  if(delay_finish) begin //idle for 0.6s to start-up the camera\r\n\t\t\t\t\t\t\tstate_d=start_sccb; \r\n\t\t\t\t\t\t\tstart_delay_d=0;\r\n\t\t\t\t\t\tend\r\n\t\t\t\t\t\telse start_delay_d=1;\r\n\r\n\t\tstart_sccb:  begin   //start of SCCB transmission\r\n\t\t\t\t\t\t\tstart=1;\r\n\t\t\t\t\t\t\twr_data=8'h42; //slave address of OV7670 for write\r\n\t\t\t\t\t\t\tstate_d=write_address;\t\r\n\t\t\t\t\t\tend\r\n\t write_address: if(ack==2'b11) begin \r\n\t\t\t\t\t\t\twr_data=message[message_index_q][15:8]; //write address\r\n\t\t\t\t\t\t\tstate_d=write_data;\r\n\t\t\t\t\t\tend\r\n\t\t write_data: if(ack==2'b11) begin \r\n\t\t\t\t\t\t\twr_data=message[message_index_q][7:0]; //write data\r\n\t\t\t\t\t\t\tstate_d=digest_loop;\r\n\t\t\t\t\t\tend\r\n\t  digest_loop: if(ack==2'b11) begin //stop sccb transmission\r\n\t\t\t\t\t\t\tstop=1;\r\n\t\t\t\t\t\t\tstart_delay_d=1;\r\n\t\t\t\t\t\t\tmessage_index_d=message_index_q+1'b1;\r\n\t\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\tend\r\n\t\t\t  delay: begin\r\n\t\t\t\t\t\t\tif(message_index_q==(MSG_INDEX+1) && delay_finish) begin \r\n\t\t\t\t\t\t\t\tstate_d=vsync_fedge; //if all messages are already digested, proceed to retrieving camera pixel data\r\n\t\t\t\t\t\t\t\tled_d=8'b0011_0011; //red LEDs\r\n\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\telse if(state==0 && delay_finish) state_d=start_sccb; //small delay before next SCCB transmission(if all messages are not yet digested)\r\n\t\t\t\t\t\tend\r\n\t\t\t  \r\n\t\t\t  \r\n\r\n\t\t\t\t///////////////Begin: Retrieving Pixel Data from Camera to be Stored to SDRAM/////////////////\r\n\t\t\t\t\r\n\t\tvsync_fedge: if(vsync_1==0 && vsync_2==1) state_d=byte1; //vsync falling edge means new frame is incoming\r\n\t\t\t\tbyte1: if(pclk_1==1 && pclk_2==0 && href_1==1 && href_2==1) begin //rising edge of pclk means new pixel data(first byte of 16-bit pixel RGB565) is available at output\r\n\t\t\t\t\t\t\t\tpixel_d[15:8]=cmos_db;\r\n\t\t\t\t\t\t\t\tstate_d=byte2;\r\n\t\t\t\t\t\t end\r\n\t\t\t\t\t\t else if(vsync_1==1 && vsync_2==1) begin\r\n\t\t\t\t\t\t\tstate_d=vsync_fedge;\r\n\t\t\t\t\t\t end\r\n\t\t\t\tbyte2: if(pclk_1==1 && pclk_2==0 && href_1==1 && href_2==1) begin //rising edge of pclk means new pixel data(second byte of 16-bit pixel RGB565) is available at output\r\n\t\t\t\t\t\t\t\tpixel_d[7:0]=cmos_db;\r\n\t\t\t\t\t\t\t\tstate_d=fifo_write;\r\n\t\t\t\t\t\t end\r\n\t\t\t\t\t\t else if(vsync_1==1 && vsync_2==1) begin\r\n\t\t\t\t\t\t\tstate_d=vsync_fedge;\r\n\t\t\t\t\t\t end\r\n\t\t fifo_write: begin //write the 16-bit data to asynchronous fifo to be retrieved later by SDRAM\r\n\t\t\t\t\t\t\t\twr_en=1;\r\n\t\t\t\t\t\t\t\tstate_d=byte1;\r\n\t\t\t\t\t\t\t\tled_d=8'b1100_1100; //debugging led\r\n\t\t\t\t\t\t end\r\n\t\tdefault: state_d=idle;\r\n\t\tendcase\r\n\t\t\r\n\t\t//Logic for increasing/decreasing brightness and contrast via the 4 keybuttons\r\n\t\tcase(sccb_state_q)\r\n\t\t\twait_init: if(state_q==byte1) begin //wait for initial SCCB transmission to finish\r\n\t\t\t\t\t\t\tsccb_state_d=sccb_idle;\r\n\t\t\t\t\t\t\taddr_d=0;\r\n\t\t\t\t\t\t\tdata_d=0;\r\n\t\t\t\t\t\t\tbrightness_d=8'h00; \r\n\t\t\t\t\t\t\tcontrast_d=8'h40;\r\n\t\t\t\t\t\t  end\r\n\t\t\tsccb_idle: if(state==0) begin //wait for any pushbutton\r\n\t\t\t\t\t\t\t\tif(key0_tick) begin//increase brightness\r\n\t\t\t\t\t\t\t\t\tbrightness_d=(brightness_q[7]==1)? brightness_q-5:brightness_q+5;\r\n\t\t\t\t\t\t\t\t\tif(brightness_q==8'h80) brightness_d=0;\r\n\t\t\t\t\t\t\t\t\tstart=1;\r\n\t\t\t\t\t\t\t\t\twr_data=8'h42; //slave address of OV7670 for write\r\n\t\t\t\t\t\t\t\t\taddr_d=8'h55; //brightness control address\r\n\t\t\t\t\t\t\t\t\tdata_d=brightness_d;\r\n\t\t\t\t\t\t\t\t\tsccb_state_d=sccb_address;\r\n\t\t\t\t\t\t\t\t\tled_d=0;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t\tif(key1_tick) begin //decrease brightness\r\n\t\t\t\t\t\t\t\t\tbrightness_d=(brightness_q[7]==1)? brightness_q+5:brightness_q-5;\r\n\t\t\t\t\t\t\t\t\tif(brightness_q==0) brightness_d=8'h80;\r\n\t\t\t\t\t\t\t\t\tstart=1;\r\n\t\t\t\t\t\t\t\t\twr_data=8'h42; \r\n\t\t\t\t\t\t\t\t\taddr_d=8'h55;\r\n\t\t\t\t\t\t\t\t\tdata_d=brightness_d;\r\n\t\t\t\t\t\t\t\t\tsccb_state_d=sccb_address;\r\n\t\t\t\t\t\t\t\t\tled_d=0;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t\telse if(key2_tick) begin //increase contrast\r\n\t\t\t\t\t\t\t\t\tcontrast_d=contrast_q+5;\r\n\t\t\t\t\t\t\t\t\tstart=1;\r\n\t\t\t\t\t\t\t\t\twr_data=8'h42; //slave address of OV7670 for write\r\n\t\t\t\t\t\t\t\t\taddr_d=8'h56; //contrast control address\r\n\t\t\t\t\t\t\t\t\tdata_d=contrast_d;\r\n\t\t\t\t\t\t\t\t\tsccb_state_d=sccb_address;\r\n\t\t\t\t\t\t\t\t\tled_d=0;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t\telse if(key3_tick) begin //change contrast\r\n\t\t\t\t\t\t\t\t\tcontrast_d=contrast_q-5;\r\n\t\t\t\t\t\t\t\t\tstart=1;\r\n\t\t\t\t\t\t\t\t\twr_data=8'h42;\r\n\t\t\t\t\t\t\t\t\taddr_d=8'h56;\r\n\t\t\t\t\t\t\t\t\tdata_d=contrast_d;\r\n\t\t\t\t\t\t\t\t\tsccb_state_d=sccb_address;\r\n\t\t\t\t\t\t\t\t\tled_d=0;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t  end\r\n\t\tsccb_address: if(ack==2'b11) begin \r\n\t\t\t\t\t\t\twr_data=addr_q; //write address\r\n\t\t\t\t\t\t\tsccb_state_d=sccb_data;\r\n\t\t\t\t\t\tend\r\n\t\t  sccb_data: if(ack==2'b11) begin \r\n\t\t\t\t\t\t\twr_data=data_q; //write databyte\r\n\t\t\t\t\t\t\tsccb_state_d=sccb_stop;\r\n\t\t\t\t\t\t end\r\n\t\t  sccb_stop: if(ack==2'b11) begin //stop\r\n\t\t\t\t\t\t\tstop=1;\r\n\t\t\t\t\t\t\tsccb_state_d=sccb_idle;\r\n\t\t\t\t\t\t\tled_d=4'b1001;\r\n\t\t\t\t\t\t end\r\n\t\t\t default: sccb_state_d=wait_init;\r\n\t\tendcase\r\n\t\t\r\n\t end\r\n\t \r\n\r\n\t assign cmos_pwdn=0; //fixed at ground\r\n\t assign cmos_rst_n=1; //fixed at high\r\n\t \r\n\t assign led=led_q; //debugging LED , non-red LED if no problem\r\n\t \r\n\t always @(posedge clk_100) begin\r\n    \t key0_prev<=key0;\r\n    \t key1_prev<=key1;\r\n    \t key2_prev<=key2;\r\n    \t key3_prev<=key3;\r\n    \t \r\n    \t key0_tick=!key0_prev && key0;\r\n    \t key1_tick=!key1_prev && key1;\r\n    \t key2_tick=!key2_prev && key2;\r\n    \t key3_tick=!key3_prev && key3;\r\n\t end\r\n\t ",
                "params": [
                  {
                    "name": "DATA"
                  }
                ],
                "ports": {
                  "in": [
                    {
                      "name": "clk_100"
                    },
                    {
                      "name": "rst_n"
                    },
                    {
                      "name": "cmos_pclk"
                    },
                    {
                      "name": "cmos_href"
                    },
                    {
                      "name": "cmos_vsync"
                    },
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              "id": "ce102c08-ea18-4291-9daf-401f70c50295",
              "type": "basic.output",
              "data": {
                "name": "rd_tick"
              },
              "position": {
                "x": 1264,
                "y": 192
              }
            },
            {
              "id": "d02afe5e-a760-4ea2-a5d2-8210cb003274",
              "type": "basic.input",
              "data": {
                "name": "clk",
                "clock": false
              },
              "position": {
                "x": 88,
                "y": 200
              }
            },
            {
              "id": "958cb0b5-9d09-4bfe-ad40-50cbd9ecec07",
              "type": "basic.output",
              "data": {
                "name": "ack",
                "range": "[1:0]",
                "size": 2
              },
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                "y": 288
              }
            },
            {
              "id": "cf3ad9bd-1237-41d3-8a67-cbda804ca8fb",
              "type": "basic.input",
              "data": {
                "name": "rst_n",
                "clock": false
              },
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                "x": 88,
                "y": 312
              }
            },
            {
              "id": "96cef29c-9007-42a6-b497-490339f4fc5b",
              "type": "basic.output",
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                "name": "rd_data",
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                "size": 8
              },
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                "y": 384
              }
            },
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              "id": "b56d2763-182e-4c24-865a-eb7464f4651e",
              "type": "basic.input",
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                "name": "start",
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                "y": 432
              }
            },
            {
              "id": "c2129178-3df0-44c0-b606-651a8ed907b3",
              "type": "basic.output",
              "data": {
                "name": "state",
                "range": "[3:0]",
                "size": 4
              },
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                "y": 472
              }
            },
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              "id": "024e5c82-f055-4db8-8684-3f226bedfa25",
              "type": "basic.input",
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                "name": "stop",
                "clock": false
              },
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                "y": 544
              }
            },
            {
              "id": "f135fe36-6011-48b7-9a11-6d81656e010b",
              "type": "basic.output",
              "data": {
                "name": "scl"
              },
              "position": {
                "x": 1264,
                "y": 568
              }
            },
            {
              "id": "900020da-04cf-4a1a-83f1-5386a8971dee",
              "type": "basic.input",
              "data": {
                "name": "wr_data",
                "range": "[7:0]",
                "clock": false,
                "size": 8
              },
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                "x": 88,
                "y": 656
              }
            },
            {
              "id": "17cce6c2-d613-4132-835f-5bdc32a07932",
              "type": "basic.output",
              "data": {
                "name": "sda"
              },
              "position": {
                "x": 1264,
                "y": 664
              }
            },
            {
              "id": "116a1de6-ed49-495d-bc13-16a29e800719",
              "type": "basic.constant",
              "data": {
                "name": "main_clock",
                "value": "100000000",
                "local": true
              },
              "position": {
                "x": 376,
                "y": 16
              }
            },
            {
              "id": "e133420a-b1e2-423c-b4d8-3919ecad496d",
              "type": "basic.constant",
              "data": {
                "name": "freq",
                "value": "100000",
                "local": true
              },
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                "x": 672,
                "y": 16
              }
            },
            {
              "id": "f754d15a-b46d-444d-af7a-6f7c5d14bd24",
              "type": "basic.constant",
              "data": {
                "name": "addr_bytes",
                "value": "2",
                "local": true
              },
              "position": {
                "x": 968,
                "y": 16
              }
            },
            {
              "id": "994faac3-57bf-4b90-ba80-7482986da895",
              "type": "basic.code",
              "data": {
                "code": "\t localparam full= (main_clock)/(2*freq),\r\n\t\t\t\t\thalf= full/2,\r\n\t\t\t\t\tcounter_width=log2(full);\r\n\t\t\t\t\t\r\n\t function integer log2(input integer n); //automatically determines the width needed by counter\r\n\t\tinteger i;\r\n\t\t begin\r\n\t\t\tlog2=1;\r\n\t\t\tfor(i=0;2**i<n;i=i+1)\r\n\t\t\t\tlog2=i+1;\r\n\t\t end\r\n\t endfunction\r\n\t\t \r\n\t //FSM state declarations\r\n\t localparam[3:0] \t\tidle=0,\r\n\t\t\t\t\t\t\tstarting=1,\r\n\t\t\t\t\t\t\tpacket=2,\r\n\t\t\t\t\t\t\tack_servant=3,\r\n\t\t\t\t\t\t\tread=4,\r\n\t\t\t\t\t\t\tack_master=5,\r\n\t\t\t\t\t\t\tstop_1=6,\r\n\t\t\t\t\t\t\tstop_2=7;\r\n\t reg[3:0] state_q=idle,state_d;\r\n\t reg op_q=0,op_d;\r\n\t reg[3:0] idx_q=0,idx_d;\r\n\t reg[8:0] wr_data_q=0,wr_data_d;\r\n\t reg[7:0] rd_data_q,rd_data_d;\r\n\t reg scl_q=0,scl_d;\r\n\t reg sda_q=0,sda_d;\r\n\t reg[counter_width-1:0] counter_q=0,counter_d;\r\n\t reg[1:0] addr_bytes_q=0,addr_bytes_d;\r\n\t wire scl_lo,scl_hi;\r\n\t wire sda_in;\r\n\t reg rd_tick;\r\n\t reg[1:0] ack;\r\n\t//register operations\r\n\t always@(posedge clk, negedge rst_n) begin\r\n\t\tif(!rst_n) begin\r\n\t\t\tstate_q<=idle;\r\n\t\t\tidx_q<=0;\r\n\t\t\twr_data_q<=0;\r\n\t\t\tscl_q<=0;\r\n\t\t\tsda_q<=0;\r\n\t\t\tcounter_q<=0;\r\n\t\t\trd_data_q<=0;\r\n\t\t\taddr_bytes_q<=0;\r\n\t\tend\r\n\t\telse begin\r\n\t\t\tstate_q<=state_d;\r\n\t\t\top_q<=op_d;\r\n\t\t\tidx_q<=idx_d;\r\n\t\t\twr_data_q<=wr_data_d;\r\n\t\t\tscl_q<=scl_d;\r\n\t\t\tsda_q<=sda_d;\r\n\t\t\tcounter_q<=counter_d;\r\n\t\t\trd_data_q<=rd_data_d;\r\n\t\t\taddr_bytes_q<=addr_bytes_d;\r\n\t\tend\r\n\t end\r\n\t \r\n\t \r\n\t //free-running clk, freq depends on parameter \"freq\"\r\n\t always @* begin\r\n\t\tcounter_d=counter_q+1;\r\n\t\tscl_d=scl_q;\r\n\t\tif(state_q==idle || state_q==starting) scl_d=1'b1;\r\n\t\telse if(counter_q==full) begin\r\n\t\t\tcounter_d=0;\r\n\t\t\tscl_d=(scl_q==0)?1'b1:1'b0;\r\n\t\tend\r\n\t end\r\n\t \r\n\t \r\n\t //FSM next-state logic\r\n\t always @* begin\r\n\t\tstate_d=state_q;\r\n\t\top_d=op_q;\r\n\t\tidx_d=idx_q;\r\n\t\twr_data_d=wr_data_q;\r\n\t\trd_data_d=rd_data_q;\r\n\t\taddr_bytes_d=addr_bytes_q;\r\n\t\tsda_d=sda_q;\r\n\t\tack=0;\r\n\t\trd_tick=0;\r\n\t\t\r\n\t\tcase(state_q)\r\n\t\t\t\t\tidle: begin\t\t//wait for the \"start\" to assert\r\n\t\t\t\t\t\t\t\tsda_d=1'b1;\r\n\t\t\t\t\t\t\t\taddr_bytes_d=addr_bytes; \r\n\t\t\t\t\t\t\t\tif(start==1'b1) begin\r\n\t\t\t\t\t\t\t\t\twr_data_d={wr_data,1'b1}; //the last 1'b1 is for the ACK coming from the servant(\"1\" means high impedance or \"reading\")\r\n\t\t\t\t\t\t\t\t\top_d= (wr_data[0])? 1:0; // if last bit(R/W bit) is one:read operation, else write operation\r\n\t\t\t\t\t\t\t\t\tidx_d=8; //index to be used on transmitting the wr_data serially(MSB first)\r\n\t\t\t\t\t\t\t\t\tstate_d=starting;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t end\r\n\t\t\t\t\t\t\t \r\n\t\t\t\tstarting: if(scl_hi) begin //start command, change sda to low while scl is high\r\n\t\t\t\t\t\t\t\tsda_d=0;\r\n\t\t\t\t\t\t\t\tstate_d=packet;\r\n\t\t\t\t\t\t\t end\r\n\t\t\t\t\t\t\t \r\n\t\t\t\t  packet: if(scl_lo) begin //transmit wr_data serially(MSB first)\r\n\t\t\t\t\t\t\t\tsda_d= (wr_data_q[idx_q]==0)? 0:1'b1;\r\n\t\t\t\t\t\t\t\tidx_d= idx_q-1;\r\n\t\t\t\t\t\t\t\tif(idx_q==0) begin\r\n\t\t\t\t\t\t\t\t\tstate_d=ack_servant;\r\n\t\t\t\t\t\t\t\t\tidx_d=0;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t end\r\n  \t\t\t\t\t\t\t \r\n\t\t\tack_servant: if(scl_hi) begin //wait for ACK bit response(9th bit) from servant\r\n\t\t\t\t\t\t\t\tack[1]=1;\r\n\t\t\t\t\t\t\t\tack[0]=!sda_in; \r\n\t\t\t\t\t\t\t\twr_data_d={wr_data,1'b1}; //after acknowledge tick, master must have already have the next data it wants to give\r\n\t\t\t\t\t\t\t\taddr_bytes_d=addr_bytes_q-1;\r\n\t\t\t\t\t\t\t\tif(stop) state_d=stop_1; //master can forcefully stops the transaction(even if response is either NACK or ACK)\r\n\t\t\t\t\t\t\t\telse if(op_q && addr_bytes_q==0) begin //start reading after writing addr_bytes of packets for address\r\n\t\t\t\t\t\t\t\t\tidx_d=7;\r\n\t\t\t\t\t\t\t\t\tstate_d=read;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t\telse begin //write next packet\r\n\t\t\t\t\t\t\t\t\tidx_d=8;\r\n\t\t\t\t\t\t\t\t\tstate_d=packet; \r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t end\r\n\t\t\t\t\t\t\t \r\n\t\t\t\t\t read: if(scl_hi) begin //read data from slave(MSB first)\r\n\t\t\t\t\t\t\t\trd_data_d[idx_q]=sda_in;\r\n\t\t\t\t\t\t\t\tidx_d=idx_q-1;\r\n\t\t\t\t\t\t\t\tif(idx_q==0) state_d=ack_master;\r\n\t\t\t\t\t\t\t end\r\n\t\t\t\t\t\t\t \r\n\t\t\t ack_master: if(scl_lo) begin //master must ACK after receiving data from servant\r\n\t\t\t\t\t\t\t\tsda_d=1'b0; \r\n\t\t\t\t\t\t\t\tif(sda_q==0) begin //one whole bit(two scl_lo) had passed\r\n\t\t\t\t\t\t\t\t\trd_tick=1;\r\n\t\t\t\t\t\t\t\t\tidx_d=7;\r\n\t\t\t\t\t\t\t\t\tif(stop) state_d=stop_1; //after receiving data, master can opt to stop\r\n\t\t\t\t\t\t\t\t\telse state_d=read; ///after receiving data, master can also just continue receving more data\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t end\r\n\t\t\t\t  stop_1: if(scl_lo) begin\r\n\t\t\t\t\t\t\t\tsda_d=1'b0;\r\n\t\t\t\t\t\t\t\tstate_d=stop_2;\r\n\t\t\t\t\t\t\t end\r\n\t\t\t\t  stop_2: if(scl_hi) begin\r\n\t\t\t\t\t\t\t\tsda_d=1'b1;\r\n\t\t\t\t\t\t\t\tstate_d=idle;\r\n\t\t\t\t\t\t\t end\r\n\t\t\t\t default: state_d=idle;\r\n\t\tendcase\r\n\t end\r\n\t \r\n\t /*\r\n\t //i2c output logic\r\n\t assign scl=scl_q? 1'bz:0; //bidiectional logic for pull-up scl\r\n\t assign sda=sda_q? 1'bz:0; //bidirectional logic for pull-up scl\r\n\t assign sda_in=sda;\r\n\t */\r\n\t \r\n\t //sccb output logic\r\n\t wire temp;\r\n\t assign scl=scl_q; //sccb scl does not need pull-up\r\n\t assign temp=(state_q==read || state_q==ack_servant);\r\n\t //assign sda=(state_q==read || state_q==ack_servant)? 1'bz : sda_q; //sccb sda does not need pull-up\r\n\t //assign sda_in=sda;\r\n\t \r\n\t TRELLIS_IO #(.DIR(\"BIDIR\")) tristate\t (\r\n\t  .B(sda),\r\n\t  .I(sda_q),\r\n\t  .T(temp),\r\n\t  .O(sda_in)\r\n\t );\r\n\t \r\n\t assign scl_hi= scl_q==1'b1 && counter_q==half && scl==1'b1; //scl is on the middle of a high(1) bit\r\n\t assign scl_lo= scl_q==1'b0 && counter_q==half; //scl is on the middle of a low(0) bit\r\n\t assign rd_data=rd_data_q;\r\n\t assign state=state_q;",
                "params": [
                  {
                    "name": "main_clock"
                  },
                  {
                    "name": "freq"
                  },
                  {
                    "name": "addr_bytes"
                  }
                ],
                "ports": {
                  "in": [
                    {
                      "name": "clk"
                    },
                    {
                      "name": "rst_n"
                    },
                    {
                      "name": "start"
                    },
                    {
                      "name": "stop"
                    },
                    {
                      "name": "wr_data",
                      "range": "[7:0]",
                      "size": 8
                    }
                  ],
                  "out": [
                    {
                      "name": "rd_tick"
                    },
                    {
                      "name": "ack",
                      "range": "[1:0]",
                      "size": 2
                    },
                    {
                      "name": "rd_data",
                      "range": "[7:0]",
                      "size": 8
                    },
                    {
                      "name": "state",
                      "range": "[3:0]",
                      "size": 4
                    },
                    {
                      "name": "scl"
                    },
                    {
                      "name": "sda"
                    }
                  ]
                }
              },
              "position": {
                "x": 280,
                "y": 176
              },
              "size": {
                "width": 880,
                "height": 568
              }
            }
          ],
          "wires": [
            {
              "source": {
                "block": "d02afe5e-a760-4ea2-a5d2-8210cb003274",
                "port": "out"
              },
              "target": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "clk"
              }
            },
            {
              "source": {
                "block": "cf3ad9bd-1237-41d3-8a67-cbda804ca8fb",
                "port": "out"
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              "target": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "rst_n"
              }
            },
            {
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                "port": "out"
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                "port": "start"
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            },
            {
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                "port": "out"
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                "port": "stop"
              }
            },
            {
              "source": {
                "block": "900020da-04cf-4a1a-83f1-5386a8971dee",
                "port": "out"
              },
              "target": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "wr_data"
              },
              "size": 8
            },
            {
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                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "rd_tick"
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                "port": "in"
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            },
            {
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                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "state"
              },
              "target": {
                "block": "c2129178-3df0-44c0-b606-651a8ed907b3",
                "port": "in"
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              "size": 4
            },
            {
              "source": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "rd_data"
              },
              "target": {
                "block": "96cef29c-9007-42a6-b497-490339f4fc5b",
                "port": "in"
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              "size": 8
            },
            {
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                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "ack"
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              "target": {
                "block": "958cb0b5-9d09-4bfe-ad40-50cbd9ecec07",
                "port": "in"
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              "size": 2
            },
            {
              "source": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "scl"
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              "target": {
                "block": "f135fe36-6011-48b7-9a11-6d81656e010b",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "116a1de6-ed49-495d-bc13-16a29e800719",
                "port": "constant-out"
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              "target": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "main_clock"
              }
            },
            {
              "source": {
                "block": "e133420a-b1e2-423c-b4d8-3919ecad496d",
                "port": "constant-out"
              },
              "target": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "freq"
              }
            },
            {
              "source": {
                "block": "f754d15a-b46d-444d-af7a-6f7c5d14bd24",
                "port": "constant-out"
              },
              "target": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "addr_bytes"
              }
            },
            {
              "source": {
                "block": "994faac3-57bf-4b90-ba80-7482986da895",
                "port": "sda"
              },
              "target": {
                "block": "17cce6c2-d613-4132-835f-5bdc32a07932",
                "port": "in"
              }
            }
          ]
        }
      }
    },
    "d907eea7eb67d965d6ff7d29a5b25b149ab2c1c4": {
      "package": {
        "name": "asyn_fifo",
        "version": "",
        "description": "fifo with different read/write clock domains",
        "author": "",
        "image": ""
      },
      "design": {
        "graph": {
          "blocks": [
            {
              "id": "8bb3356e-15e2-4047-9da2-c274df3d9964",
              "type": "basic.output",
              "data": {
                "name": "full"
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              "position": {
                "x": 880,
                "y": 64
              }
            },
            {
              "id": "d5133b14-8949-42d9-abde-a580b73e0117",
              "type": "basic.input",
              "data": {
                "name": "rst_n",
                "clock": false
              },
              "position": {
                "x": -344,
                "y": 80
              }
            },
            {
              "id": "a80c3621-d849-470e-b504-32bba73a0b27",
              "type": "basic.output",
              "data": {
                "name": "empty"
              },
              "position": {
                "x": 880,
                "y": 144
              }
            },
            {
              "id": "3249211a-b2cd-4941-9d1a-546ccd37346a",
              "type": "basic.input",
              "data": {
                "name": "clk_write",
                "clock": false
              },
              "position": {
                "x": -344,
                "y": 192
              }
            },
            {
              "id": "ef58acda-b3cb-4e8f-806b-698a1b90f115",
              "type": "basic.output",
              "data": {
                "name": "data_count_w",
                "range": "[10:0]",
                "size": 11
              },
              "position": {
                "x": 880,
                "y": 224
              }
            },
            {
              "id": "7369df1f-28d3-4c2e-bdac-d425afd5f280",
              "type": "basic.input",
              "data": {
                "name": "clk_read",
                "clock": false
              },
              "position": {
                "x": -344,
                "y": 312
              }
            },
            {
              "id": "a4d9a19d-aba7-4a9f-afcc-0b35ad590e9a",
              "type": "basic.output",
              "data": {
                "name": "data_count_r",
                "range": "[10:0]",
                "size": 11
              },
              "position": {
                "x": 888,
                "y": 312
              }
            },
            {
              "id": "2b26ad98-ae4c-41cb-8a36-e0ec12ca5438",
              "type": "basic.input",
              "data": {
                "name": "write",
                "clock": false
              },
              "position": {
                "x": -344,
                "y": 424
              }
            },
            {
              "id": "39710cbf-d7ed-4871-a865-fdddba67bc2b",
              "type": "basic.output",
              "data": {
                "name": "data_read",
                "range": "[15:0]",
                "size": 16
              },
              "position": {
                "x": 1288,
                "y": 440
              }
            },
            {
              "id": "c299b4bf-bcfb-4497-acab-9484123dfa89",
              "type": "basic.input",
              "data": {
                "name": "read",
                "clock": false
              },
              "position": {
                "x": -336,
                "y": 536
              }
            },
            {
              "id": "f8f3d4ff-9aba-4a33-8bc8-7fa5a1e921cb",
              "type": "basic.input",
              "data": {
                "name": "data_write",
                "range": "[15:0]",
                "clock": false,
                "size": 16
              },
              "position": {
                "x": 888,
                "y": 624
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            },
            {
              "id": "970fe62e-ffcd-403a-9592-b44e4285fc31",
              "type": "basic.code",
              "data": {
                "code": " \t localparam DATA_WIDTH=16,\r\n\t            FIFO_DEPTH_WIDTH=11,\r\n\t            FIFO_DEPTH=2**FIFO_DEPTH_WIDTH;\r\n\t \r\n\t initial begin\r\n\t\tfull=0;\r\n\t\tempty=1;\r\n\t end\r\n\t \r\n\t reg full, empty;\r\n\t reg[10:0] data_count_r,data_count_w;\r\n\t \r\n\t ///////////////////WRITE CLOCK DOMAIN//////////////////////////////\r\n\t reg[FIFO_DEPTH_WIDTH:0] w_ptr_q=0; //binary counter for write pointer\r\n\t reg[FIFO_DEPTH_WIDTH:0] r_ptr_sync; //binary pointer for read pointer sync to write clk\r\n\t wire[FIFO_DEPTH_WIDTH:0] w_grey,w_grey_nxt; //grey counter for write pointer\r\n\t reg[FIFO_DEPTH_WIDTH:0] r_grey_sync; //grey counter for the read pointer synchronized to write clock\r\n\t \r\n\t reg[3:0] i; //log_2(FIFO_DEPTH_WIDTH)\r\n\t \r\n\t assign w_grey=w_ptr_q^(w_ptr_q>>1); //binary to grey code conversion for current write pointer\r\n\t assign w_grey_nxt=(w_ptr_q+1'b1)^((w_ptr_q+1'b1)>>1);  //next grey code\r\n\t assign we= write && !full; \r\n\t \r\n\t //register operation\r\n\t always @(posedge clk_write,negedge rst_n) begin\r\n\t\tif(!rst_n) begin\r\n\t\t\tw_ptr_q<=0;\r\n\t\t\tfull<=0;\r\n\t\tend\r\n\t\telse begin\r\n\t\t\tif(write && !full) begin //write condition\r\n\t\t\t\tw_ptr_q<=w_ptr_q+1'b1; \r\n\t\t\t\tfull <= w_grey_nxt == {~r_grey_sync[FIFO_DEPTH_WIDTH:FIFO_DEPTH_WIDTH-1],r_grey_sync[FIFO_DEPTH_WIDTH-2:0]}; //algorithm for full logic which can be observed on the grey code table\r\n\t\t\tend\r\n\t\t\telse full <= w_grey == {~r_grey_sync[FIFO_DEPTH_WIDTH:FIFO_DEPTH_WIDTH-1],r_grey_sync[FIFO_DEPTH_WIDTH-2:0]}; \r\n\t\t\t\r\n\t\t\tfor(i=0;i<=FIFO_DEPTH_WIDTH;i=i+1) r_ptr_sync[i]=^(r_grey_sync>>i); //grey code to binary converter \r\n\t\t\tdata_count_w <= (w_ptr_q>=r_ptr_sync)? (w_ptr_q-r_ptr_sync):(FIFO_DEPTH-r_ptr_sync+w_ptr_q); //compares write pointer and sync read pointer to generate data_count\r\n\t\tend\t\t\t\t\t\t\t\r\n\t end\r\n\r\n\t/////////////////////////////////////////////////////////////////////\r\n\t \r\n\t \r\n\t  ///////////////////READ CLOCK DOMAIN//////////////////////////////\r\n\t reg[FIFO_DEPTH_WIDTH:0] r_ptr_q=0; //binary counter for read pointer\r\n\t wire[FIFO_DEPTH_WIDTH:0] r_ptr_d;\r\n\t reg[FIFO_DEPTH_WIDTH:0] w_ptr_sync; //binary counter for write pointer sync to read clk\r\n\t reg[FIFO_DEPTH_WIDTH:0] w_grey_sync; //grey counter for the write pointer synchronized to read clock\r\n\t wire[FIFO_DEPTH_WIDTH:0] r_grey,r_grey_nxt; //grey counter for read pointer \r\n\t \r\n\t \r\n\t assign r_grey= r_ptr_q^(r_ptr_q>>1);  //binary to grey code conversion\r\n\t assign r_grey_nxt= (r_ptr_q+1'b1)^((r_ptr_q+1'b1)>>1); //next grey code\r\n\t assign r_ptr_d= (read && !empty)? r_ptr_q+1'b1:r_ptr_q;\r\n\t \r\n\t //register operation\r\n\t always @(posedge clk_read,negedge rst_n) begin\r\n\t\tif(!rst_n) begin\r\n\t\t\tr_ptr_q<=0;\r\n\t\t\tempty<=1;\r\n\t\tend\r\n\t\telse begin\r\n\t\t\tr_ptr_q<=r_ptr_d;\r\n\t\t\tif(read && !empty) empty <= r_grey_nxt==w_grey_sync;//empty condition\r\n\t\t\telse empty <= r_grey==w_grey_sync; \r\n\t\t\t\r\n\t\t\tfor(i=0;i<=FIFO_DEPTH_WIDTH;i=i+1) w_ptr_sync[i]=^(w_grey_sync>>i); //grey code to binary converter\r\n\t\t\tdata_count_r = (w_ptr_q>=r_ptr_sync)? (w_ptr_q-r_ptr_sync):(FIFO_DEPTH-r_ptr_sync+w_ptr_q); //compares read pointer to sync write pointer to generate data_count\r\n\t\tend\r\n\t end\r\n\t ////////////////////////////////////////////////////////////////////////\r\n\t \r\n\t \r\n\t /////////////////////CLOCK DOMAIN CROSSING//////////////////////////////\r\n\t reg[FIFO_DEPTH_WIDTH:0] r_grey_sync_temp;\r\n\t reg[FIFO_DEPTH_WIDTH:0] w_grey_sync_temp;\r\n\t always @(posedge clk_write) begin //2 D-Flipflops for reduced metastability in clock domain crossing from READ DOMAIN to WRITE DOMAIN\r\n\t\tr_grey_sync_temp<=r_grey; \r\n\t\tr_grey_sync<=r_grey_sync_temp;\r\n\t end\r\n\t always @(posedge clk_read) begin //2 D-Flipflops for reduced metastability in clock domain crossing from WRITE DOMAIN to READ DOMAIN\r\n\t\tw_grey_sync_temp<=w_grey;\r\n\t\tw_grey_sync<=w_grey_sync_temp;\r\n\t end\r\n\t \r\n\t//////////////////////////////////////////////////////////////////////////\r\n\t\r\n\tassign w_ptr=w_ptr_q[10:0];\r\n\tassign r_ptr=r_ptr_d[10:0];\r\n\t \r\n\t \r\n\t ",
                "params": [],
                "ports": {
                  "in": [
                    {
                      "name": "rst_n"
                    },
                    {
                      "name": "clk_write"
                    },
                    {
                      "name": "clk_read"
                    },
                    {
                      "name": "write"
                    },
                    {
                      "name": "read"
                    }
                  ],
                  "out": [
                    {
                      "name": "full"
                    },
                    {
                      "name": "empty"
                    },
                    {
                      "name": "data_count_w",
                      "range": "[10:0]",
                      "size": 11
                    },
                    {
                      "name": "data_count_r",
                      "range": "[10:0]",
                      "size": 11
                    },
                    {
                      "name": "we"
                    },
                    {
                      "name": "w_ptr",
                      "range": "[10:0]",
                      "size": 11
                    },
                    {
                      "name": "r_ptr",
                      "range": "[10:0]",
                      "size": 11
                    }
                  ]
                }
              },
              "position": {
                "x": -80,
                "y": 56
              },
              "size": {
                "width": 872,
                "height": 568
              }
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              "id": "92a8254a-616c-4519-b4de-2eb167bcdbbb",
              "type": "1d9258a2bc4ed945d0b74b74233780dbf8002961",
              "position": {
                "x": 1112,
                "y": 376
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              "size": {
                "width": 96,
                "height": 192
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          "wires": [
            {
              "source": {
                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "we"
              },
              "target": {
                "block": "92a8254a-616c-4519-b4de-2eb167bcdbbb",
                "port": "3f2843d0-3cc6-4eaf-b1d6-626734cccc96"
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            {
              "source": {
                "block": "d5133b14-8949-42d9-abde-a580b73e0117",
                "port": "out"
              },
              "target": {
                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "rst_n"
              }
            },
            {
              "source": {
                "block": "3249211a-b2cd-4941-9d1a-546ccd37346a",
                "port": "out"
              },
              "target": {
                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "clk_write"
              }
            },
            {
              "source": {
                "block": "7369df1f-28d3-4c2e-bdac-d425afd5f280",
                "port": "out"
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              "target": {
                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "clk_read"
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            {
              "source": {
                "block": "2b26ad98-ae4c-41cb-8a36-e0ec12ca5438",
                "port": "out"
              },
              "target": {
                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "write"
              },
              "vertices": [
                {
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            },
            {
              "source": {
                "block": "c299b4bf-bcfb-4497-acab-9484123dfa89",
                "port": "out"
              },
              "target": {
                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "read"
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            {
              "source": {
                "block": "3249211a-b2cd-4941-9d1a-546ccd37346a",
                "port": "out"
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                "port": "48f81890-670a-41ba-8f90-d72d9ab64452"
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                "port": "out"
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                "port": "f9cae3c2-80d3-4173-aa41-ce7097ad51be"
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                "port": "full"
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              "target": {
                "block": "8bb3356e-15e2-4047-9da2-c274df3d9964",
                "port": "in"
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            {
              "source": {
                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "empty"
              },
              "target": {
                "block": "a80c3621-d849-470e-b504-32bba73a0b27",
                "port": "in"
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            },
            {
              "source": {
                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "data_count_w"
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              "target": {
                "block": "ef58acda-b3cb-4e8f-806b-698a1b90f115",
                "port": "in"
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              "size": 11
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                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "data_count_r"
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                "port": "in"
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              "size": 11
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            {
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                "block": "970fe62e-ffcd-403a-9592-b44e4285fc31",
                "port": "w_ptr"
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                "block": "92a8254a-616c-4519-b4de-2eb167bcdbbb",
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                "block": "92a8254a-616c-4519-b4de-2eb167bcdbbb",
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                "block": "92a8254a-616c-4519-b4de-2eb167bcdbbb",
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    },
    "1d9258a2bc4ed945d0b74b74233780dbf8002961": {
      "package": {
        "name": "dual_port_ram",
        "version": "",
        "description": "uses block ram with separate read/write clock",
        "author": "",
        "image": ""
      },
      "design": {
        "graph": {
          "blocks": [
            {
              "id": "f9cae3c2-80d3-4173-aa41-ce7097ad51be",
              "type": "basic.input",
              "data": {
                "name": "clk_r",
                "clock": false
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              "position": {
                "x": 224,
                "y": 360
              }
            },
            {
              "id": "48f81890-670a-41ba-8f90-d72d9ab64452",
              "type": "basic.input",
              "data": {
                "name": "clk_w",
                "clock": false
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                "x": 224,
                "y": 416
              }
            },
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              "id": "3f2843d0-3cc6-4eaf-b1d6-626734cccc96",
              "type": "basic.input",
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                "name": "we",
                "clock": false
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                "range": "[15:0]",
                "size": 16
              },
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                "y": 488
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                "clock": false,
                "size": 16
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                "y": 512
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            },
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              "type": "basic.input",
              "data": {
                "name": "addr_a",
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                "clock": false,
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                "y": 568
              }
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            {
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              "type": "basic.input",
              "data": {
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                "range": "[10:0]",
                "clock": false,
                "size": 11
              },
              "position": {
                "x": 224,
                "y": 616
              }
            },
            {
              "id": "f46d498c-494a-432c-8021-02c5ebce2c0f",
              "type": "basic.code",
              "data": {
                "code": "\tlocalparam ADDR_WIDTH=11,\r\n\t               DATA_WIDTH=16;\r\n\t\r\n\treg[DATA_WIDTH-1:0] ram[2**ADDR_WIDTH-1:0];\r\n\treg[ADDR_WIDTH-1:0] addr_b_q;\r\n\t\r\n\talways @(posedge clk_w) begin\r\n\t\tif(we) ram[addr_a]<=din;\r\n\tend\r\n\talways @(posedge clk_r) begin\r\n\t\taddr_b_q<=addr_b;\t\r\n\tend\r\n\tassign dout=ram[addr_b_q];",
                "params": [],
                "ports": {
                  "in": [
                    {
                      "name": "clk_r"
                    },
                    {
                      "name": "clk_w"
                    },
                    {
                      "name": "we"
                    },
                    {
                      "name": "din",
                      "range": "[15:0]",
                      "size": 16
                    },
                    {
                      "name": "addr_a",
                      "range": "[10:0]",
                      "size": 11
                    },
                    {
                      "name": "addr_b",
                      "range": "[10:0]",
                      "size": 11
                    }
                  ],
                  "out": [
                    {
                      "name": "dout",
                      "range": "[15:0]",
                      "size": 16
                    }
                  ]
                }
              },
              "position": {
                "x": 480,
                "y": 368
              },
              "size": {
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                "height": 304
              }
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          ],
          "wires": [
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                "block": "f9cae3c2-80d3-4173-aa41-ce7097ad51be",
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              "target": {
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                "port": "clk_r"
              }
            },
            {
              "source": {
                "block": "48f81890-670a-41ba-8f90-d72d9ab64452",
                "port": "out"
              },
              "target": {
                "block": "f46d498c-494a-432c-8021-02c5ebce2c0f",
                "port": "clk_w"
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            {
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                "port": "out"
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            {
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                "block": "05533ffc-ee3b-4e61-a728-51c2cecb5518",
                "port": "out"
              },
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                "block": "f46d498c-494a-432c-8021-02c5ebce2c0f",
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              },
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            {
              "source": {
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                "port": "out"
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              "target": {
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                "port": "addr_b"
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            },
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              },
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              },
              "size": 16
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            {
              "source": {
                "block": "f46d498c-494a-432c-8021-02c5ebce2c0f",
                "port": "dout"
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    "7584fb605879572e125546fbe4e340f49f534878": {
      "package": {
        "name": "sdram_interface",
        "version": "",
        "description": "stores pixel data from camera then send data to HDMI",
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                "code": "\t //FSM state declarations\r\n\t localparam idle=0,\r\n\t\t\t\t\tburst_op=1;\r\n\t\t\t\t\t\r\n\t reg state_q=0,state_d;\t \r\n\t reg[14:0] colored_addr_q=0,colored_addr_d;\r\n\t reg[14:0] rd_addr_q=0,rd_addr_d;\r\n\t reg rw,rw_en;\r\n\t reg orig_q,orig_d;\r\n\t reg[14:0] f_addr;\r\n\t wire[15:0] s2f_data;\r\n\t wire s2f_data_valid;\r\n\t wire ready;\r\n\t wire[7:0] data_fifo;\r\n\t wire[9:0] fifo_data_count;\r\n\t wire[15:0] f2s_data;\r\n\t wire[9:0] data_count_r;\r\n\t \r\n\t //register operation\r\n\t always @(posedge clk,negedge rst_n) begin\r\n\t\tif(!rst_n) begin\r\n\t\t\tstate_q<=0;\r\n\t\t\tcolored_addr_q<=0;\r\n\t\t\trd_addr_q<=0;\r\n\t\t\torig_q<=0;\r\n\t\tend\r\n\t\telse begin\r\n\t\t\tstate_q<=state_d;\r\n\t\t\tcolored_addr_q<=colored_addr_d;\r\n\t\t\trd_addr_q<=rd_addr_d;\r\n\t\t\torig_q<=orig_d;\r\n\t\tend\r\n\t end\r\n\t \r\n\t //FSM next-state declarations\r\n\t always @* begin\r\n\t\tstate_d=state_q;\r\n\t\tcolored_addr_d=colored_addr_q;\r\n\t\trd_addr_d=rd_addr_q;\r\n\t\tf_addr=0;\r\n\t\trw=0;\r\n\t\trw_en=0;\r\n\t\torig_d=orig_q;\r\n\t\t\r\n\t\tcase(state_q)\r\n\t\t\t    idle: if(data_count_camera_fifo>512 && ready) begin //wait for the first 512 pixel-data to fill the asyn_fifo then burst-write it to sdram\r\n\t\t\t\t\t\t\trw_en=1;\r\n\t\t\t\t\t\t\trw=0;\r\n\t\t\t\t\t\t\tcolored_addr_d=1;\r\n\t\t\t\t\t\t\tf_addr=colored_addr_q;\r\n\t\t\t\t\t\t\tstate_d=burst_op;\r\n\t\t\t\t\t\t\torig_d=1;\r\n\t\t\t\t\t\t end\r\n\t\t\tburst_op: if(ready) begin //choose whether to read the colored image or edge detected image OR write to the fifo of VGA\r\n\t\t\t\t\t\t\t\tif(data_count_camera_fifo>512) begin //colored image container is filled to 512 thus we can now burst-write(full-page has 512 data) it to SDRAM \r\n\t\t\t\t\t\t\t\t\trw_en=1;\r\n\t\t\t\t\t\t\t\t\trw=0;\r\n\t\t\t\t\t\t\t\t\tcolored_addr_d=(colored_addr_q==599)? 0:colored_addr_q+1'b1; //One frame(640x480) fills the addresses 0-to-599\r\n\t\t\t\t\t\t\t\t\tf_addr=colored_addr_q;\r\n\t\t\t\t\t\t\t\t\torig_d=1;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\telse if(data_count_w<250) begin //asyn_fifo of VGA has only 250 pixel data left, we will now fill it by another 512 pixel data via burst reading the sdram\r\n\t\t\t\t\t\t\t\t\trw_en=1;\r\n\t\t\t\t\t\t\t\t\trw=1;\r\n\t\t\t\t\t\t\t\t\trd_addr_d=(rd_addr_q==599)? 0:rd_addr_q+1'b1;\r\n\t\t\t\t\t\t\t\t\tf_addr= rd_addr_q;\r\n\t\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\t end\r\n\t\t\t default: state_d=idle;\r\n\t\tendcase\r\n\t end\r\n\t\r\n\t assign rd_camera= f2s_data_valid && orig_d;\r\n\t ",
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    "7654a26df27dc86dd8d2555396a8ef7adbfac1fb": {
      "package": {
        "name": "sdram,_controller",
        "version": "",
        "description": "SDRAM single-data rate controller ",
        "author": "",
        "image": ""
      },
      "design": {
        "graph": {
          "blocks": [
            {
              "id": "2c020077-a4c4-4b0a-8717-60f94f303b2c",
              "type": "basic.output",
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              "id": "84a8d6e3-cf0e-4b80-9801-9088b708e82d",
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              "data": {
                "name": "s_cas_n"
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              "data": {
                "code": "\t //s_clock(clk input to sdram) is 180 degrees lagging from main clock to solve the hold-setup time requirements of sdram\r\n\t ODDRX1F oddr_primitive\r\n\t (\r\n\t\t.D0(1'b0), //1'b0\r\n\t\t.D1(1'b1), //1'b1\r\n\t\t.SCLK(clk),\r\n\t\t.Q(s_clk)\r\n\t);\r\n\t//FSM states\t\t//initialize\r\n\t localparam[3:0]  start=0,\r\n\t\t\t\t\t\t\tprecharge_init=1, \r\n\t\t\t\t\t\t\trefresh_1=2,\r\n\t\t\t\t\t\t\trefresh_2=3,\r\n\t\t\t\t\t\t\tload_mode_reg=4,\r\n\t\t\t\t\t\t\t//normal operation\r\n\t\t\t\t\t\t\tidle=5,\r\n\t\t\t\t\t\t\tread=6,\r\n\t\t\t\t\t\t\tread_data=7,\r\n\t\t\t\t\t\t\twrite=8,\r\n\t\t\t\t\t\t\twrite_burst=9,\r\n\t\t\t\t\t\t\t//refresh every 7.81us\r\n\t\t\t\t\t\t\trefresh=10,\r\n\t\t\r\n\t\t\t\t\t\t\tdelay=11; //waiting state for any amount of delay needed\r\n\t\t\t\t\t\t\t\r\n\t//minimum time specs needed(in clks for 143MHz(7ns))\r\n\tlocalparam[3:0] t_RP=2, //15ns(precharge) \r\n\t\t\t\t\tt_RC=6, //60ns(active to active,ref to ref) ///////////////\r\n\t\t\t\t\tt_MRD=2, //2 clk,(mode register) /2/\r\n\t\t\t\t\tt_RCD=2, //15ns (active to read/write)      ////////////\r\n\t\t\t\t\tt_WR=2, //2clk delay after writing before manual/auto precharge can start\r\n\t\t\t\t\tt_CL=3; //CAS latency(delay of data_out after read command)\r\n\t\t\t\t\t\r\n\t//commands {cs_n,ras_n,cas_n,we_n} REFER TO THE DATASHEET: winbond W9825G6KH\r\n\tlocalparam[3:0]  cmd_precharge=4'b0010,\r\n\t\t\t\t\t\t  cmd_NOP=4'b0111,\r\n\t\t\t\t\t\t  cmd_activate=4'b0011,\r\n\t\t\t\t\t\t  cmd_write=4'b0100,\r\n\t\t\t\t\t\t  cmd_read=4'b0101,\r\n\t\t\t\t\t\t  cmd_setmode=4'b0000,\r\n\t\t\t\t\t\t  cmd_refresh=4'b0001;\r\n\t\t\t\t\t\t  \r\n\treg[3:0] state_q,state_d; //_q is registered output, _d is input to DFF\r\n\treg[3:0] nxt_q,nxt_d; //state after next state\r\n\treg[3:0] cmd_q,cmd_d; //{cs_n,ras_n,cas_n,we_n}\r\n\treg[15:0] delay_ctr_q,delay_ctr_d; //stores delay needed(max is 200us for the initialization sequence)\r\n\treg[10:0] refresh_ctr_q=0,refresh_ctr_d; \r\n\treg refresh_flag_q,refresh_flag_d;\r\n\treg[9:0] burst_index_q=0,burst_index_d; //stores the data left to be burst(512 for full page burst)\r\n\treg rw_d,rw_q,rw_en_q,rw_en_d;\r\n\t\r\n\t//buffer for output for a glitch-free signal\r\n\treg[12:0] s_addr_q,s_addr_d;\r\n\treg[1:0] s_ba_q,s_ba_d;\r\n\treg[15:0] s_dq_q,s_dq_d;\r\n\treg tri_q,tri_d;\r\n\t\r\n\t//buffer for input\r\n\treg[14:0] f_addr_q,f_addr_d;\r\n\treg[15:0] f2s_data_q,f2s_data_d;\r\n\treg[15:0] s2f_data_q,s2f_data_d;\r\n\treg s2f_data_valid_q,s2f_data_valid_d;\r\n\r\n\twire[15:0] s_dq_in;\r\n\twire LDQM,HDQM;\r\n\treg f2s_data_valid,ready;\r\n\t\r\n\t//register operation\r\n\talways @(posedge clk,negedge rst_n) begin\r\n\t\tif(!rst_n) begin\r\n\t\t\tstate_q<=start;\r\n\t\t\tnxt_q<=start;\r\n\t\t\tcmd_q<=cmd_NOP;\r\n\t\t\tdelay_ctr_q<=0;\r\n\t\t\trefresh_ctr_q<=0;\r\n\t\t\ts_addr_q<=0;\r\n\t\t\ttri_q<=0;\r\n\t\t\trw_q<=0;\r\n\t\t\trw_en_q<=0;\r\n\t\t\t\r\n\t\t\ts_ba_q<=0;\r\n\t\t\ts_dq_q<=0;\r\n\t\t\tf_addr_q<=0;\r\n\t\t\trw_q<=0;\r\n\t\t\tf2s_data_q<=0;\r\n\t\t\ts2f_data_q<=0;\r\n\t\t\ts2f_data_valid_q<=0;\r\n\t\t\trw_q<=0;\r\n\t\t\trefresh_flag_q<=0;\r\n\t\t\tburst_index_q<=0;\r\n\t\tend\r\n\t\telse begin\r\n\t\t\tstate_q<=state_d;\r\n\t\t\tnxt_q<=nxt_d;\r\n\t\t\tcmd_q<=cmd_d;\r\n\t\t\tdelay_ctr_q<=delay_ctr_d;\r\n\t\t\trefresh_ctr_q<=refresh_ctr_d;\r\n\t\t\ts_addr_q<=s_addr_d;\r\n\t\t\ttri_q<=tri_d;\r\n\t\t\trefresh_flag_q<=refresh_flag_d;\r\n\t\t\tburst_index_q<=burst_index_d;\r\n\t\t\t\r\n\t\t\ts_ba_q<=s_ba_d;\r\n\t\t\ts_dq_q<=s_dq_d;\r\n\t\t\tf_addr_q<=f_addr_d;\r\n\t\t\trw_q<=rw_d;\r\n\t\t\tf2s_data_q<=f2s_data_d;\r\n\t\t\ts2f_data_q<=s2f_data_d;\r\n\t\t\ts2f_data_valid_q<=s2f_data_valid_d;\r\n\t\t\trw_q<=rw_d;\r\n\t\t\trw_en_q<=rw_en_d;\r\n\t\tend\r\n\tend\r\n\t\r\n\r\n\t//next-state logics\r\n\talways @* begin\r\n\t\tstate_d=state_q;\r\n\t\tnxt_d=nxt_q;\r\n\t\tcmd_d=cmd_NOP; //always default to No Operation \r\n\t\tdelay_ctr_d=delay_ctr_q;\r\n\t\tready=0; \r\n\t\ts_addr_d=s_addr_q;\r\n\t\ts_ba_d=s_ba_q;\r\n\t\ts_dq_d=s_dq_q;\r\n\t\tf_addr_d=f_addr_q;\r\n\t\trw_d=rw_q;\r\n\t\tf2s_data_d=f2s_data_q;\r\n\t\ts2f_data_d=s2f_data_q;\r\n\t\ttri_d=0;  \r\n\t\ts2f_data_valid_d=1'b0;\r\n\t\tf2s_data_valid=1'b0;\r\n\t\tburst_index_d=burst_index_q;\r\n\t\trw_d=rw_q;\r\n\t\trw_en_d=rw_en_q;\r\n\t\t\r\n\t\t//refresh every 7.8us or else data will be lost. \r\n\t\trefresh_flag_d=refresh_flag_q;\r\n\t\trefresh_ctr_d=refresh_ctr_q+1'b1;\r\n\t\tif(refresh_ctr_q==750) begin //7.7 us\r\n\t\t\trefresh_ctr_d=0;\r\n\t\t\trefresh_flag_d=1;\r\n\t\tend\r\n\t\t\r\n\t\t\r\n\t\t\r\n\t\tcase(state_q)\r\n\t\t\t\t\t////////////////BEGIN:INITIALIZE////////////////\r\n\t\t\tdelay: begin //wait here for a delay specified by delay_ctr_q(parameter in time specs)\r\n\t\t\t\t\t\tdelay_ctr_d=delay_ctr_q-1'b1;\r\n\t\t\t\t\t\tif(delay_ctr_d==0) state_d=nxt_q;\t\r\n\t\t\t\t\t\tif(nxt_q==write) tri_d=1;\r\n\t\t\t\t\t end\r\n\t\t\tstart: begin //initiliaze after power-up\r\n\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\tnxt_d=precharge_init;\r\n\t\t\t\t\t\tdelay_ctr_d=16'd30_000; //wait for 200us\r\n\t\t\t\t\t\ts_addr_d=0;\r\n\t\t\t\t\t\ts_ba_d=0;\r\n\t\t\t\t\t end\r\nprecharge_init: begin //precharge ALL banks (A10 must be high)\r\n\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\tnxt_d=refresh_1;\r\n\t\t\t\t\t\tdelay_ctr_d=t_RP-1;\r\n\t\t\t\t\t\tcmd_d=cmd_precharge;\r\n\t\t\t\t\t\ts_addr_d[10]=1'b1;\r\n\t\t\t\t\t end\r\n\t\trefresh_1: begin\r\n\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\tnxt_d=refresh_2;\r\n\t\t\t\t\t\tdelay_ctr_d=t_RC-1;\r\n\t\t\t\t\t\tcmd_d=cmd_refresh;\r\n\t\t\t\t\t  end\r\n\t\trefresh_2: begin\r\n\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\tnxt_d=load_mode_reg;\r\n\t\t\t\t\t\tdelay_ctr_d=t_RC-1;\r\n\t\t\t\t\t\tcmd_d=cmd_refresh;\r\n\t\t\t\t\t  end\r\n  load_mode_reg: begin\r\n\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\tnxt_d=idle;\r\n\t\t\t\t\t\tdelay_ctr_d=t_MRD-1;\r\n\t\t\t\t\t\tcmd_d=cmd_setmode;\r\n\t\t\t\t\t\ts_addr_d=13'b 000_0_00_011_0_111; //{reserved,writemode,reserved,CL,AddressingMode,BurstLength}\r\n\t\t\t\t\t\ts_ba_d=2'b00; //reserved\r\n\t\t\t\t\t  end\r\n\t\t\t\t\t ////////////////END:INITIALIZE////////////////\r\n\t\t\t\t\t\r\n\t\t\t\t\t////////////////BEGIN:NORMAL OPERATION////////////////\r\n\t\t     idle: begin \r\n\t\t\t\t\t\tready=rw_en_q? 0:1;\r\n\t\t\t\t\t\tif(rw_en_q) begin //permission granted for r/w operation \r\n\t\t\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\t\t\tcmd_d=cmd_activate;\r\n\t\t\t\t\t\t\t\tdelay_ctr_d=t_RCD-1;\r\n\t\t\t\t\t\t\t\tnxt_d=rw_q?read:write;\r\n\t\t\t\t\t\t\t\tburst_index_d=0;\r\n\t\t\t\t\t\t\t\trw_en_d=1'b0;\r\n\t\t\t\t\t\t\t\t{s_addr_d,s_ba_d}=f_addr_q;//row + bank addr\r\n\t\t\t\t\t\tend\r\n\t\t\t\t\t\telse if(refresh_flag_q || rw_en) begin  //refresh every 7.7us and BEFORE start of burst read/write operations\r\n\t\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\t\tnxt_d=refresh;\r\n\t\t\t\t\t\t\tdelay_ctr_d=t_RP-1;\r\n\t\t\t\t\t\t\tcmd_d=cmd_precharge; //precharge all banks first before auto-refresh\r\n\t\t\t\t\t\t\ts_addr_d[10]=1'b1;\r\n\t\t\t\t\t\t\trefresh_flag_d=0;\r\n\t\t\t\t\t\t\tif(rw_en) begin \r\n\t\t\t\t\t\t\t\trw_en_d=rw_en;\r\n\t\t\t\t\t\t\t\tf_addr_d=f_addr; \r\n\t\t\t\t\t\t\t\trw_d=rw;\r\n\t\t\t\t\t\t\tend\r\n\t\t\t\t\t\tend\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t  end \r\n\t     refresh:\tbegin\r\n\t\t\t\t\t\t state_d=delay;\r\n\t\t\t\t\t\t nxt_d=idle;\r\n\t\t\t\t\t\t delay_ctr_d=t_RC-1;\r\n\t\t\t\t\t\t cmd_d=cmd_refresh;\r\n\t\t\t\t\t\tend\t\t\t\t\t \r\n\t\t\tread: begin \r\n\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\tdelay_ctr_d=t_CL; //(WHYYY???)not subtracted by one since the sdram is \"late\" by half a cycle so register is one clk after the expected clock latency delay\r\n\t\t\t\t\t\tcmd_d=cmd_read;\r\n\t\t\t\t\t\ts_addr_d=0;//what column to activate(in full page mode, column starts at LEFTMOST which is zero)\r\n\t\t\t\t\t\ts_ba_d=f_addr_q[1:0]; //what bank to activate\r\n\t\t\t\t\t\ts_addr_d[10]=1'b0; //no auto-precharge for full page burst\r\n\t\t\t\t\t\tnxt_d=read_data;\r\n\t\t\t\t\tend\r\n\t read_data: begin //read data after CAS latency of 3 clk\r\n\t\t\t\t\t\ts2f_data_d=s_dq_in;\r\n\t\t\t\t\t\ts2f_data_valid_d=1'b1;\r\n\t\t\t\t\t\tburst_index_d=burst_index_q+1;\r\n\t\t\t\t\t\tif(burst_index_q==512) begin //if all 512 burst data is already finished, precharge then go back to idle\r\n\t\t\t\t\t\t\ts2f_data_valid_d=1'b0;\r\n\t\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\t\tnxt_d=idle;\r\n\t\t\t\t\t\t\tdelay_ctr_d=t_RP-1;\r\n\t\t\t\t\t\t\tcmd_d=cmd_precharge;\r\n\t\t\t\t\t\tend\r\n\t\t\t\t\tend\t\t\r\n\t\t write: begin  \r\n\t\t\t\t\t\tf2s_data_d=f2s_data; //write data\r\n\t\t\t\t\t\tf2s_data_valid=1'b1;\r\n\t\t\t\t\t\ts_addr_d=0; //what column to activate(in full page mode, column starts at LEFTMOST which is zero)\r\n\t\t\t\t\t\ts_ba_d=f_addr_q[1:0];\r\n\t\t\t\t\t\ts_addr_d[10]=1'b0; //no auto-precharge for full page burst\r\n\t\t\t\t\t\ttri_d=1'b1; //tristate buffer on since we output/write signals\r\n\t\t\t\t\t\tcmd_d=cmd_write;\r\n\t\t\t\t\t\tstate_d=write_burst;\r\n\t\t\t\t\t\tburst_index_d=burst_index_q+1;\r\n\t\t\t\t   end\r\n  write_burst: begin    //write data burst will start at assertion of f2s_data_valid\r\n\t\t\t\t\t\tf2s_data_d=f2s_data; //write data\r\n\t\t\t\t\t\tf2s_data_valid=1'b1; \r\n\t\t\t\t\t\ttri_d=1'b1; //tristate buffer on since we output/write signals\r\n\t\t\t\t\t\tburst_index_d=burst_index_q+1;\r\n\t\t\t\t\t\t\r\n\t\t\t\t\t\tif(burst_index_q==512) begin //if all 512 burst data is already finished, precharge then go back to idle\r\n\t\t\t\t\t\t\ttri_d=0;\r\n\t\t\t\t\t\t\tstate_d=delay;\r\n\t\t\t\t\t\t\tf2s_data_valid=1'b0;\r\n\t\t\t\t\t\t\tnxt_d=idle;\r\n\t\t\t\t\t\t\tdelay_ctr_d=t_RP+t_WR-1;\r\n\t\t\t\t\t\t\tcmd_d=cmd_precharge;\r\n\t\t\t\t\t\tend\r\n\t\t\t\t\tend\r\n\t\t\t\t  ////////////////END:NORMAL OPERATION////////////////\r\n\t\t\t\t  \r\n\t\tdefault: state_d=start;\r\n\t\tendcase\r\n\t\t\r\n\t\t\r\n\t\t\t\r\n\t\r\n\tend\r\n\t\r\n\t//assign the outputs to corresponding buffers\r\n\tassign s_cs_n=cmd_q[3],\r\n\t\t\t s_ras_n=cmd_q[2],\r\n\t\t\t s_cas_n=cmd_q[1],\r\n\t\t\t s_we_n=cmd_q[0];\r\n\tassign s_cke=1'b1; \r\n\tassign LDQM=1'b0, \r\n\t\t\t HDQM=1'b0;\r\n\tassign s_addr=s_addr_q;\r\n\tassign s_ba=s_ba_q;\r\n    //assign s_dq=tri_q? f2s_data_q:16'hzzzz; //tri-state output,tri=1 for write , tri=0 for read(hi-Z)\r\n    //assign s_dq_in=s_dq;\r\n\tassign s2f_data=s2f_data_q;\r\n\tassign s2f_data_valid=s2f_data_valid_q;\r\n\tassign s_dqm={HDQM,LDQM};\r\n\t\r\n\t\r\n\r\n\tgenvar i;\r\n\tgenerate\r\n\t\tfor(i=0;i<16;i=i+1) begin\r\n\t\t\tTRELLIS_IO #(.DIR(\"BIDIR\")) u0\r\n\t\t\t (\r\n\t\t\t  .B(s_dq[i]),\r\n\t\t\t  .I(f2s_data_q[i]),\r\n\t\t\t  .T({!tri_q}),\r\n\t\t\t  .O(s_dq_in[i])\r\n\t\t\t );\r\n\t\tend\r\n\tendgenerate\r\n",
                "params": [],
                "ports": {
                  "in": [
                    {
                      "name": "clk"
                    },
                    {
                      "name": "rst_n"
                    },
                    {
                      "name": "rw"
                    },
                    {
                      "name": "rw_en"
                    },
                    {
                      "name": "f_addr",
                      "range": "[14:0]",
                      "size": 15
                    },
                    {
                      "name": "f2s_data",
                      "range": "[15:0]",
                      "size": 16
                    }
                  ],
                  "out": [
                    {
                      "name": "s2f_data",
                      "range": "[15:0]",
                      "size": 16
                    },
                    {
                      "name": "s2f_data_valid"
                    },
                    {
                      "name": "f2s_data_valid"
                    },
                    {
                      "name": "ready"
                    },
                    {
                      "name": "s_clk"
                    },
                    {
                      "name": "s_cke"
                    },
                    {
                      "name": "s_cs_n"
                    },
                    {
                      "name": "s_ras_n"
                    },
                    {
                      "name": "s_cas_n"
                    },
                    {
                      "name": "s_we_n"
                    },
                    {
                      "name": "s_addr",
                      "range": "[12:0]",
                      "size": 13
                    },
                    {
                      "name": "s_ba",
                      "range": "[1:0]",
                      "size": 2
                    },
                    {
                      "name": "s_dqm",
                      "range": "[1:0]",
                      "size": 2
                    },
                    {
                      "name": "s_dq",
                      "range": "[15:0]",
                      "size": 16
                    }
                  ]
                }
              },
              "position": {
                "x": -64,
                "y": 56
              },
              "size": {
                "width": 712,
                "height": 784
              }
            }
          ],
          "wires": [
            {
              "source": {
                "block": "e0bf4f7a-a33b-46aa-8409-bed733e88f30",
                "port": "out"
              },
              "target": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "rst_n"
              }
            },
            {
              "source": {
                "block": "135b5699-8d5b-4754-9479-6cd1c640ee18",
                "port": "out"
              },
              "target": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "clk"
              }
            },
            {
              "source": {
                "block": "d1bc3f91-c6f0-4392-8dbe-2ac12cdaee6a",
                "port": "out"
              },
              "target": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "rw"
              }
            },
            {
              "source": {
                "block": "593ec4c8-be1d-4910-9828-0377c29f97b5",
                "port": "out"
              },
              "target": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "rw_en"
              }
            },
            {
              "source": {
                "block": "182f13d5-e19e-4bc0-b7b8-8fb1a14cd7c4",
                "port": "out"
              },
              "target": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "f_addr"
              },
              "size": 15
            },
            {
              "source": {
                "block": "f6f51260-d952-447a-8ef0-a681308e4e0d",
                "port": "out"
              },
              "target": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "f2s_data"
              },
              "size": 16
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s2f_data"
              },
              "target": {
                "block": "2c020077-a4c4-4b0a-8717-60f94f303b2c",
                "port": "in"
              },
              "size": 16
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s2f_data_valid"
              },
              "target": {
                "block": "6c33540c-7a83-4147-b315-d779d82373f9",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "f2s_data_valid"
              },
              "target": {
                "block": "5511b566-9cdf-46b3-bf0d-c5201b86b5fe",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "ready"
              },
              "target": {
                "block": "f1c8c807-d8d7-47f0-97ae-7d99e3b812c6",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_clk"
              },
              "target": {
                "block": "b503943f-a58c-4d06-9591-baaeb43013f9",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_cke"
              },
              "target": {
                "block": "68e7111d-d93b-4b07-aed1-59b5dc00de6f",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_cs_n"
              },
              "target": {
                "block": "a1650371-7bcf-4acf-901d-76442d5541fd",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_ras_n"
              },
              "target": {
                "block": "84a8d6e3-cf0e-4b80-9801-9088b708e82d",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_cas_n"
              },
              "target": {
                "block": "d90e095e-8026-4089-aaea-f77814478d72",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_we_n"
              },
              "target": {
                "block": "ff42fe92-e732-4533-9253-ea29c84664b6",
                "port": "in"
              }
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_addr"
              },
              "target": {
                "block": "04f12a81-6411-4f44-aac4-2b187e38f665",
                "port": "in"
              },
              "size": 13
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_ba"
              },
              "target": {
                "block": "990715a9-adc0-4916-8bcd-2a8402e63b7e",
                "port": "in"
              },
              "size": 2
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_dq"
              },
              "target": {
                "block": "d117d044-7a1c-4854-9265-65f595b2bafc",
                "port": "in"
              },
              "size": 16
            },
            {
              "source": {
                "block": "4ac6b98d-3044-422a-88d7-aba96bd48748",
                "port": "s_dqm"
              },
              "target": {
                "block": "ba22fd93-b0c7-4735-a987-9777279d2dcd",
                "port": "in"
              },
              "size": 2
            }
          ]
        }
      }
    },
    "ecf31260dd48795892e8d6342e109c7dee628c18": {
      "package": {
        "name": "hdmi_interface",
        "version": "",
        "description": "Receives pixel data from SDRAM to be displayed on monitor",
        "author": "Angelo Jacobo",
        "image": 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      },
      "design": {
        "graph": {
          "blocks": [
            {
              "id": "88f2c6e3-5876-4951-bc2b-77190b6776cf",
              "type": "basic.output",
              "data": {
                "name": "clk_vga"
              },
              "position": {
                "x": 272,
                "y": 96
              }
            },
            {
              "id": "3ea21c4f-6ef8-4639-aefd-4b5f9d4d8208",
              "type": "basic.input",
              "data": {
                "name": "clk",
                "clock": false
              },
              "position": {
                "x": -120,
                "y": 232
              }
            },
            {
              "id": "a9369dbc-67c7-4d86-8f16-e67a6ba01a1d",
              "type": "basic.output",
              "data": {
                "name": "rd_en"
              },
              "position": {
                "x": 1120,
                "y": 248
              }
            },
            {
              "id": "e79ac974-3588-490c-88b9-d0408a2bff12",
              "type": "basic.input",
              "data": {
                "name": "rst_n",
                "clock": false
              },
              "position": {
                "x": -120,
                "y": 320
              }
            },
            {
              "id": "3e06c7b8-b07c-49a6-9dfc-099cac26ec35",
              "type": "basic.input",
              "data": {
                "name": "empty_fifo",
                "clock": false
              },
              "position": {
                "x": -120,
                "y": 376
              }
            },
            {
              "id": "90e9049e-258b-4765-88d0-ec965fcdd405",
              "type": "basic.output",
              "data": {
                "name": "gpdi_dp",
                "range": "[3:0]",
                "size": 4
              },
              "position": {
                "x": 1120,
                "y": 384
              }
            },
            {
              "id": "de40a194-92fe-4bae-95da-8227716f808c",
              "type": "basic.input",
              "data": {
                "name": "din",
                "range": "[15:0]",
                "clock": false,
                "size": 16
              },
              "position": {
                "x": -120,
                "y": 432
              }
            },
            {
              "id": "0d4550b0-b765-4255-9660-d5190b878040",
              "type": "62743d8c66363d9e92664eaea4dac7e7e3981cd0",
              "position": {
                "x": 16,
                "y": 232
              },
              "size": {
                "width": 96,
                "height": 64
              }
            },
            {
              "id": "7c9ab9b3-e58c-4dd5-8224-e22b1d9354fd",
              "type": "45dab8372de05be9cf77616b5a3febe0a5baedcd",
              "position": {
                "x": 1320,
                "y": 480
              },
              "size": {
                "width": 96,
                "height": 224
              }
            },
            {
              "id": "1438ec0d-ec27-4d1e-9473-bd3c24ed700f",
              "type": "basic.code",
              "data": {
                "code": "\t reg rd_en;\r\n\t //FSM state declarations\r\n\t localparam delay=0,\r\n\t\t\t\t\tidle=1,\r\n\t\t\t\t\tdisplay=2;\r\n\t\t\t\t\t\r\n\t reg[1:0] state_q,state_d;\r\n\t reg[7:0] red,green,blue;\r\n\t wire[1:0] tmds_red,tmds_green,tmds_blue,tmds_clk;\r\n\t wire clk_5x;\r\n\t \r\n\t //register operations\r\n\t always @(posedge clk_vga,negedge rst_n) begin\r\n\t\tif(!rst_n) begin\r\n\t\t\tstate_q<=delay;\r\n\t\tend\r\n\t\telse begin\r\n\t\t\tstate_q<=state_d;\r\n\t\tend\r\n\t end\r\n\t \r\n\t //FSM next-state logic\r\n\t always @* begin\r\n\t state_d=state_q;\r\n\t rd_en=0;\r\n\t red=0;\r\n\t green=0;\r\n\t blue=0;\r\n\t\t\t\r\n\t\tcase(state_q)\r\n\t\t  delay: if(pixel_x==640 && pixel_y==480) state_d=idle; //delay of one frame(33ms) needed to start up the camera\r\n\t\t\tidle:  if(pixel_x==0 && pixel_y==0 && !empty_fifo) begin //wait for pixel-data coming from asyn_fifo \t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\tred=din[15:11]<<3;\r\n\t\t\t\t\t\t\tgreen=din[10:5]<<2;\r\n\t\t\t\t\t\t\tblue=din[4:0]<<3;\r\n\t\t\t\t\t\t\trd_en=1;\t\r\n\t\t\t\t\t\t\tstate_d=display;\r\n\t\t\t\t\tend\r\n\t\tdisplay: if(!blank) begin //we will continue to read the asyn_fifo as long as current pixel coordinate is inside the visible screen(640x480) \r\n\t\t\t\t\t\t\tred=din[15:11]<<3;\r\n\t\t\t\t\t\t\tgreen=din[10:5]<<2;\r\n\t\t\t\t\t\t\tblue=din[4:0]<<3;\r\n\t\t\t\t\t\t\trd_en=1;\t\r\n\t\t\t\t\tend\r\n\t\tdefault: state_d=delay;\r\n\t\tendcase\r\n\t end\r\n \r\n\t\r\n\t//ODDR instantiatons for Double-Data Rate operation\r\n\t\tODDRX1F ddr0_clock (.D0(tmds_clk   [0] ), .D1(tmds_clk   [1] ), .Q(gpdi_dp[3]), .SCLK(clk_5x), .RST(0));\r\n        ODDRX1F ddr0_red   (.D0(tmds_red   [0] ), .D1(tmds_red   [1] ), .Q(gpdi_dp[2]), .SCLK(clk_5x), .RST(0));\r\n        ODDRX1F ddr0_green (.D0(tmds_green [0] ), .D1(tmds_green [1] ), .Q(gpdi_dp[1]), .SCLK(clk_5x), .RST(0));\r\n        ODDRX1F ddr0_blue  (.D0(tmds_blue  [0] ), .D1(tmds_blue  [1] ), .Q(gpdi_dp[0]), .SCLK(clk_5x), .RST(0));\r\n\t\t\r\n\t\t",
                "params": [],
                "ports": {
                  "in": [
                    {
                      "name": "clk_5x"
                    },
                    {
                      "name": "clk_vga"
                    },
                    {
                      "name": "rst_n"
                    },
                    {
                      "name": "empty_fifo"
                    },
                    {
                      "name": "din",
                      "range": "[15:0]",
                      "size": 16
                    },
                    {
                      "name": "blank"
                    },
                    {
                      "name": "tmds_red",
                      "range": "[1:0]",
                      "size": 2
                    },
                    {
                      "name": "tmds_green",
                      "range": "[1:0]",
                      "size": 2
                    },
                    {
                      "name": "tmds_blue",
                      "range": "[1:0]",
                      "size": 2
                    },
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                      "name": "tmds_clk",
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                "code": "//Copyright (C) 2021 Hirosh Dabui hirosh@dabui.de\r\n\r\nlocalparam\r\n\t/* VGA_1280x720@60Hz */          \r\n\t\t VPOL            = 1,\t      \r\n\t\t HPOL            = 0,\t      \r\n\t\t FRAME_RATE      = 30,\t    \r\n\t/* vertical timing frame */     \r\n\t\t VBP             = 33,      \r\n\t\t VFP             = 10,      \r\n\t\t VSLEN           = 2,\t      \r\n\t\t VACTIVE         = 480,\t    \r\n\t/* horizontal timing frame */   \r\n\t\t HBP             = 48,\t    \r\n\t\t HFP             = 16,\t    \r\n\t\t HSLEN           = 96,\t    \r\n\t\t HACTIVE         = 640;\r\n//////////////////////////////////////\r\n\r\nlocalparam VTOTAL            = VACTIVE + VFP + VSLEN + VBP;\t\r\nlocalparam HTOTAL            = HACTIVE + HFP + HSLEN + HBP;\t\r\nlocalparam PIXEL_CLK         = (VTOTAL * HTOTAL) * FRAME_RATE;\r\n\r\nreg[10:0] out_hcnt,out_vcnt;\r\n\t//Display Final Values \r\n\tinitial begin \r\n\t  $display(\"VACTIVE:%d\", VACTIVE); \r\n\t  $display(\"HACTIVE:%d\", HACTIVE); \r\n\t  $display(\"VBP:%d\", VBP);\r\n\t  $display(\"VFP:%d\", VFP); \r\n\t  $display(\"HBP:%d\", HBP); \r\n\t  $display(\"HFP:%d\", HFP); \r\n\t  $display(\"VSLEN:%d\", VSLEN); \r\n\t  $display(\"HSLEN:%d\", HSLEN); \r\n\t  $display(\"VTOTAL:%d\", VTOTAL); \r\n\t  $display(\"HTOTAL:%d\", HTOTAL); \r\n\t  $display(\"Framerate:%d\", FRAME_RATE); \r\n\t  $display(\"PIXEL Frequency:%d\", PIXEL_CLK); \r\n\tend \r\n\t\r\n    /*\r\n     *\r\n     *         +\r\n     *         |\r\n     *         | VACTIVE\r\n     *         |\r\n     *         |       HACTIVE            HFP    HSLEN    HBP\r\n     *         ------------------------++-----++-------+------+\r\n     *         |\r\n     *         |\r\n     *         |\r\n     *         |\r\n     *         |\r\n     *         +\r\n     *         | VFP\r\n     *         +\r\n     *         +\r\n     *         |\r\n     *         | VSLEN\r\n     *         |\r\n     *         +\r\n     *         +\r\n     *         |\r\n     *         | HBP\r\n     *         |\r\n     *         +\r\n     *\r\n     */\r\n\r\n\r\n\r\nassign out_vsync = ((out_vcnt >= (VACTIVE + VFP -1)) && (out_vcnt < (VACTIVE + VFP + VSLEN))) ^ ~VPOL;\r\nassign out_hsync = ((out_hcnt >= (HACTIVE + HFP -1)) && (out_hcnt < (HACTIVE + HFP + HSLEN))) ^ ~HPOL;\r\nassign out_blank = (out_hcnt >= HACTIVE) || (out_vcnt >= VACTIVE);\r\n\r\nwire hcycle = out_hcnt == (HTOTAL -1) || ~reset_n;\r\nwire vcycle = out_vcnt == (VTOTAL -1) || ~reset_n;\r\n\r\nalways @(posedge pclk) out_hcnt <= hcycle ? 0 : out_hcnt + 1;\r\n\r\nalways @(posedge pclk) begin\r\n    if (hcycle) out_vcnt <= vcycle ? 0 : out_vcnt + 1;\r\nend\r\n",
                "params": [],
                "ports": {
                  "in": [
                    {
                      "name": "pclk"
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                    {
                      "name": "reset_n"
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                  ],
                  "out": [
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                    },
                    {
                      "name": "out_vsync"
                    },
                    {
                      "name": "out_blank"
                    },
                    {
                      "name": "out_hcnt",
                      "range": "[10:0]",
                      "size": 11
                    },
                    {
                      "name": "out_vcnt",
                      "range": "[10:0]",
                      "size": 11
                    }
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              "type": "basic.code",
              "data": {
                "code": "//Copyright (C) 2021 Hirosh Dabui hirosh@dabui.de\r\n\r\nlocalparam DDR_ENABLED=1,\r\n            OUT_TMDS_MSB = DDR_ENABLED ? 1 : 0;\r\n\r\n\r\n/**/\r\nreg       tmds_shift_load   = 0;\r\nreg [3:0] tmds_modulo       = 0;\r\nreg [9:0] tmds_shift_red    = 0;\r\nreg [9:0] tmds_shift_green  = 0;\r\nreg [9:0] tmds_shift_blue   = 0;\r\nreg [9:0] tmds_shift_clk    = 0;\r\n\r\nwire [9:0] tmds_pixel_clk = 10'b00000_11111;\r\n\r\n\r\nwire max_shifts_reached = tmds_modulo == (DDR_ENABLED ? 4 : 9);\r\nalways @(posedge tmds_clk) tmds_modulo      <= max_shifts_reached ? 0 : tmds_modulo + 1;\r\nalways @(posedge tmds_clk) tmds_shift_load  <= max_shifts_reached;\r\n\r\nalways @(posedge tmds_clk) begin //shifts 2-bits at a time if DDR is enabled, else shift 1-bit at a time\r\n    tmds_shift_red    <= tmds_shift_load ? tmds_red       : {DDR_ENABLED ? 2'b00 : 1'b0, tmds_shift_red   [9: DDR_ENABLED ? 2 : 1]};\r\n    tmds_shift_green  <= tmds_shift_load ? tmds_green     : {DDR_ENABLED ? 2'b00 : 1'b0, tmds_shift_green [9: DDR_ENABLED ? 2 : 1]};\r\n    tmds_shift_blue   <= tmds_shift_load ? tmds_blue      : {DDR_ENABLED ? 2'b00 : 1'b0, tmds_shift_blue  [9: DDR_ENABLED ? 2 : 1]};\r\n    tmds_shift_clk    <= tmds_shift_load ? tmds_pixel_clk : {DDR_ENABLED ? 2'b00 : 1'b0, tmds_shift_clk   [9: DDR_ENABLED ? 2 : 1]};\r\nend\r\n\r\nassign out_tmds_clk   = tmds_shift_clk    [ OUT_TMDS_MSB : 0 ];\r\nassign out_tmds_red   = tmds_shift_red    [ OUT_TMDS_MSB : 0 ];\r\nassign out_tmds_green = tmds_shift_green  [ OUT_TMDS_MSB : 0 ];\r\nassign out_tmds_blue  = tmds_shift_blue   [ OUT_TMDS_MSB : 0 ];",
                "params": [],
                "ports": {
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                    {
                      "name": "tmds_clk"
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                    {
                      "name": "tmds_red",
                      "range": "[9:0]",
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                    },
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                      "size": 10
                    },
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                      "size": 10
                    }
                  ],
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                      "name": "out_tmds_red",
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                    },
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                    },
                    {
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                      "range": "[1:0]",
                      "size": 2
                    },
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                      "name": "out_tmds_clk",
                      "range": "[1:0]",
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                    }
                  ]
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            {
              "id": "10297cc2-a310-415d-b6f4-423124baa4f9",
              "type": "basic.code",
              "data": {
                "code": "//Copyright (C) 2021 Hirosh Dabui hirosh@dabui.de\r\n\r\nparameter LEGACY_DVI_CONTROL_LUT = 0;\r\nreg[9:0] q_out;\r\nfunction [3:0] N0;\r\n    input [7:0] d;\r\n    integer i;\r\n    begin\r\n        N0 = 0;\r\n        for (i = 0; i < 8; i=i+1)\r\n            N0 = N0 + !d[i];\r\n    end\r\nendfunction\r\n\r\nfunction [3:0] N1;\r\n    input [7:0] d;\r\n    integer i;\r\n    begin\r\n        N1 = 0;\r\n        for (i = 0; i < 8; i=i+1)\r\n            N1 = N1 + d[i];\r\n    end\r\nendfunction\r\n\r\nreg signed [7:0] cnt_prev = 0;\r\nreg signed [7:0] cnt = 0;\r\n\r\nreg [8:0] q_m;\r\n\r\nalways @(*) begin\r\n\r\n    if ( (N1(D) > 4) | (N1(D) == 4) & (D[0] == 0) ) begin\r\n\r\n        q_m[0] =           D[0];\r\n        q_m[1] = q_m[0] ~^ D[1];\r\n        q_m[2] = q_m[1] ~^ D[2];\r\n        q_m[3] = q_m[2] ~^ D[3];\r\n        q_m[4] = q_m[3] ~^ D[4];\r\n        q_m[5] = q_m[4] ~^ D[5];\r\n        q_m[6] = q_m[5] ~^ D[6];\r\n        q_m[7] = q_m[6] ~^ D[7];\r\n        q_m[8] = 1'b0;\r\n\r\n    end else begin\r\n\r\n        q_m[0] =          D[0];\r\n        q_m[1] = q_m[0] ^ D[1];\r\n        q_m[2] = q_m[1] ^ D[2];\r\n        q_m[3] = q_m[2] ^ D[3];\r\n        q_m[4] = q_m[3] ^ D[4];\r\n        q_m[5] = q_m[4] ^ D[5];\r\n        q_m[6] = q_m[5] ^ D[6];\r\n        q_m[7] = q_m[6] ^ D[7];\r\n        q_m[8] = 1'b1;\r\n\r\n    end /* (N1(D) > 4) | (N1(D) == 4) & (D[0] == 0) */\r\n\r\nend\r\n\r\nalways @(posedge clk) begin\r\n\r\n    if (DE) begin\r\n\r\n        if ((cnt_prev == 0) | (N1(q_m[7:0]) == N0(q_m[7:0]))) begin\r\n\r\n            q_out[9]   <= ~q_m[8];\r\n            q_out[8]   <=  q_m[8];\r\n            q_out[7:0] <= q_m[8] ? q_m[7:0] : ~q_m[7:0];\r\n\r\n            if (q_m[8] == 0) begin\r\n                cnt = cnt_prev + (N0(q_m[7:0]) - N1(q_m[7:0]));\r\n            end else begin\r\n                cnt = cnt_prev + (N1(q_m[7:0]) - N0(q_m[7:0]));\r\n            end /*q_m[8] == 0*/\r\n\r\n        end else begin\r\n\r\n            if ( (cnt_prev > 0 & (N1(q_m[7:0]) > N0(q_m[7:0]))) |\r\n                    (cnt_prev < 0 & (N0(q_m[7:0]) > N1(q_m[7:0]))) ) begin\r\n                q_out[9] <= 1;\r\n                q_out[8] <= q_m[8];\r\n                q_out[7:0] <= ~q_m[7:0];\r\n                cnt = cnt_prev + 2*q_m[8] + (N0(q_m[7:0]) - N1(q_m[7:0]));\r\n            end else begin\r\n                q_out[9] <= 0;\r\n                q_out[8] <= q_m[8];\r\n                q_out[7:0] <= q_m[7:0];\r\n                cnt = cnt_prev + 2*(~q_m[8]) + (N1(q_m[7:0]) - N0(q_m[7:0]));\r\n            end /*\r\n                (cnt_prev > 0 & N1(q_m[7:0]) > N0(q_m[7:0]))) |\r\n                (cnt_prev < 0 & N0(q_m[7:0]) > N1(q_m[7:0])))\r\n              */\r\n\r\n        end /* ((cnt_prev == 0) | (N1(q_m[7:0]) == N0(q_m[7:0]))) */\r\n\r\n    end else begin\r\n        /* !DE */\r\n        cnt = 0;\r\n        /* hsync -> c0 | vsync -> c1 */\r\n        case ({C1, C0})\r\n`ifdef LEGACY_DVI_CONTROL_LUT\r\n            /* dvi control data lut */\r\n            2'b00: q_out <= 10'b00101_01011;\r\n            2'b01: q_out <= 10'b11010_10100;\r\n            2'b10: q_out <= 10'b00101_01010;\r\n            2'b11: q_out <= 10'b11010_10101;\r\n`else\r\n            /* hdmi control data period */\r\n            2'b00: q_out <= 10'b1101010100;\r\n            2'b01: q_out <= 10'b0010101011;\r\n            2'b10: q_out <= 10'b0101010100;\r\n            2'b11: q_out <= 10'b1010101011;\r\n`endif\r\n        endcase\r\n\r\n    end /* DE */\r\n\r\n    cnt_prev <= cnt;\r\n\r\nend\r\n",
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            {
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