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Can these warnings be removed?

Tool: OpenSTA

Subcategory: Warning handling

Conversation

oharboe

I've found myself ignoring warnings when I shouldn't...

In that regard, it would be helpful to fix some warnings that are always there, so I pay more attention...

Can these be fixed?

[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 13178, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 13211, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 13244, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 13277, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 13310, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 13343, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 13376, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 14772, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 14805, timing group from output port.
[WARNING STA-0164] /OpenROAD-flow-scripts/flow/platforms/asap7/lib/asap7sc7p5t_SIMPLE_RVT_TT_nldm_211120.lib.gz line 14838, timing group from output port.

rovinski

They cannot, the warnings are due to the structure of the cells in the PDK and the way they were characterized into a timing model. You can, however, stop the warnings from showing up by using suppress_message STA 164.

vijayank88

I have discussed about this WARNING STA-016 month back with Tom. Replied:

The output to output timing edges in the liberty cause this warning.
If it's just this one cell, you could add it to the don't use list. 
I think this warning means the timing will be less accurate.
If you are doing experiments it may also be safe to ignore.