| # Can these warnings be removed? |
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| Tool: OpenSTA |
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| Subcategory: Warning handling |
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| ## Conversation |
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| ### oharboe |
| I've found myself ignoring warnings when I shouldn't...
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| In that regard, it would be helpful to fix some warnings that are always there, so I pay more attention...
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| Can these be fixed?
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| ```
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| [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.
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| [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.
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| [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.
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| [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.
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| [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.
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| [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.
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| [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.
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| [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.
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| [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.
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| [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.
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| ```
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| ### 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`. |
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| ### vijayank88 |
| I have discussed about this `WARNING STA-016` month back with Tom. Replied:
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| ```
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| The output to output timing edges in the liberty cause this warning.
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| If it's just this one cell, you could add it to the don't use list.
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| I think this warning means the timing will be less accurate.
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| If you are doing experiments it may also be safe to ignore.
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| ``` |
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