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I ran the flow for the asap7 ibex design. After opening the OpenROAD GUI using I further proceed to run and then the reported timing metrics are I have a few questions related to this procedure
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Replies: 3 comments 7 replies
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Your two timing reports are likely using different parasitics modeling. The former uses extracted parasitics from the actual detailed routing. The latter uses parasitics estimated only from placement. This is comparing apples to oranges. For a valid comparison you need to rerun global routing, then detailed routing, then parasitic extraction.
Save the .def file and then use the conversion script in ORFS. |
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Thank you for the explanation and answers to the queries. For the steps, I was referring to the guide here " The repair_design command inserts buffers on nets to repair max slew, max capacitance and max fanout violations and on long wires to reduce RC delay. It also resizes gates to normalize slews. Use estimate_parasitics -placement before repair_design to account for estimated post-routing parasitics." Here the last line mentions Also, according to the tutorial, it should fix the timing issues? Or |
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with repair timing i get So with this, I should be able to save the def and sdc files and generate a new gdsii file? Or should I follow the steps you described in your previous reply? |
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@vijayank88 please make a PR to fix this and the missing variable below. |
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I don't think you should try to run repair design at the end of the flow. That's not a flow we support at this point. You could try increasing SETUP_SLACK_MARGIN to overfix earlier in the flow. |
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This would have to be set in the Is there a document where all the variables for the config file are described or a way I could get a better understanding of these variables? Thank you for the help! |
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#852 updated flow variables now. |
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Yes. Many are documented in https://openroad-flow-scripts.readthedocs.io/en/latest/user/FlowVariables.html though this one looks to be missing. The ultimate truth is in https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/tree/master/flow/scripts where the actual scripts that use the variables live. |
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Okay. Thanks for the information! |
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Yes.
Many are documented in https://openroad-flow-scripts.readthedocs.io/en/latest/user/FlowVariables.html though this one looks to be missing.
The ultimate truth is in https://github.com/The-OpenROAD-Project/OpenROAD-flow-scripts/tree/master/flow/scripts where the actual scripts that use the variables live.