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Guild: wafer.space Community
Channel: ℹ️ - Information / ⁉️-questions / Constant inputs in SDC
After: 2025-10-31 11:59 p.m.
Before: 2025-12-01 12:00 a.m.
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[2025-11-06 10:49 p.m.] tholin
So, this would be more of a "nice to have" for my project to make the results of top-level timing analysis look a bit neater, but my die is a multi-project die, with 5 input-only pins providing project selection through a multiplexer. However, during top-level timing analysis, STA considers changes on the project select inputs in-between clock ticks. As the chip is designed to have those pads permanently bonded/wired to power or ground according to the desired selection, they should be considered constants for the purpose of timing analysis. But how do I codify this in my .sdc file?


[2025-11-07 5:44 a.m.] mole99
You can ignore a timing path using `set_false_path`.


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