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The-OpenROAD-Project / OpenSTA

OpenSTA engine
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Problem in reading in CCS Liberty files #176

Closed gburdo closed 1 month ago

gburdo commented 1 year ago

Hi. I tried to load TSMC 12nm Standard Cells libraries .lib files into sta and I get the following Warnings: Warning: /tools/technology/TSMC/12nm/12FFC-LL/STD_CELLs/TSMCHOME/digital/Front_End/timing_power_noise/CCS/tcbn12ffcllbwp16p90_100a/tcbn12ffcllbwp16p90tt0p8v25c_ccs.lib line 631, table template ccsn_vout_template not found. Warning: /tools/technology/TSMC/12nm/12FFC-LL/STD_CELLs/TSMCHOME/digital/Front_End/timing_power_noise/CCS/tcbn12ffcllbwp16p90_100a/tcbn12ffcllbwp16p90tt0p8v25c_ccs.lib line 649, table template ccsn_prop_template not found. Warning: /tools/technology/TSMC/12nm/12FFC-LL/STD_CELLs/TSMCHOME/digital/Front_End/timing_power_noise/CCS/tcbn12ffcllbwp16p90_100a/tcbn12ffcllbwp16p90tt0p8v25c_ccs.lib line 1047, table template ccs_template not found.

I get a lot of these warnings. What is interesting is that when I load a similar file (TSMC 12nm) but a smaller one I don't get these warnings.

I checked the .lib files and the tables templates are defined in it: image image image

It also looks like sta doesn't get timing constraints information from the .lib file (probably warnings I get indicate it) because when I define a clock in my design I don't get any timing paths while I know that there are such (appear in PrimeTime).

Unfortunately I cannot send the TSMC 12nm .lib files for debug since I'm not allowed to do that. Any clue to what to look at?

Thanks a lot Gennady

jjcherry56 commented 1 year ago

what is the git commit of the version you are running? Some issues with css noise libraries (which it looks like what you are reading) were fixed a few months ago. ccs delay calculation is not supported in the public version of opensta but the libraries should read. I don't have tsmc12 libraries but I the pdk may include nldm libraries you can use instead.

If you REALLY want to use those libraries you should be able to generate a testcas that includes the relevant groups in one of the public libraries in opensta/examples but no numbers from tsmc to reproduce the issue.

gburdo commented 1 year ago

Hi jjcherry56.

Thanks a lot for your quick response. I did follow this to install OpenSTA: image

I will download the NDLM libraries and try using them. Will update you. I will try to create a test-case with modified CCS libraries and then will post it as well.

Best Regards

gburdo commented 1 year ago

Hi. I tried using NDLM library files. With NDLM no warnings. Got timing arcs. Didn't check yet if I see all expected arc.

I did try to write out my design .lib file with I got 2 scenarios:

  1. Crash with core dump
  2. STA is getting stuck for hours and consumes more and more memory.

I have 64GB RAM so I would not expect any RAM issues with my small test-case design,

This is the script I tried to run: image

Thanks a lot

jjcherry56 commented 1 year ago

"intalling with cmake" does not really answer the question of what commit you are running because the repo could be months old. 'git rev-parse HEAD' or git log tells you the commit you have checked out.

write_timing_model may be blowing up because the design has many inputs combinationally connected to outputs which is by definition has an polynomial run time. But that is a separate issue and one I could not possibly address without a testcase that has all of the files to run it.

maliberty commented 1 month ago

Issues or PRs should be filed with https://github.com/parallaxsw/OpenSTA if still relevant. This is effectively a fork (though not strictly for historical reasons).