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The-OpenROAD-Project / asap7

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Question related to M5, M6 spacing? #3

Open sakundu opened 1 year ago

sakundu commented 1 year ago

In the Post-Route-Opt database of one of our internal design on ASAP7, we noticed lots of spacing DRC. After further analysis we found that for M6 the minimum spacing requirement is 0.128. But, the required spacing is 0.288 according to the parallel run length spacing table. Which indicates that we always need to maintain 0.288 spacing between two M6 shapes. So, is this spacing rule correct?

Additionally, if we need a 0.288 spacing, is it acceptable to adjust the M6 layer pitch to 0.416 (combining 0.288 spacing and 0.128 width)?

maliberty commented 1 year ago

In https://github.com/The-OpenROAD-Project/asap7/blob/master/asap7sc7p5t_28/techlef_misc/asap7_tech_4x_201209.lef it seems correct. I'm guessing this is a bug.

maliberty commented 1 year ago

It looks like Anton fixed the one above in https://github.com/The-OpenROAD-Project/asap7/commit/b86c7e9336427b85ba7eaf5eb64dcef53a85c0f9 - I guess the same fix is needed for the version you are using.

maliberty commented 1 year ago

If you want to make a similar PR I'm fine with approving it.