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Guild: wafer.space Community
Channel: Information / questions / Constant inputs in SDC
After: 10/31/2025 23:59
Before: 12/01/2025 00:00
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[11/06/2025 22:49] 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?


[11/07/2025 05:44] mole99
You can ignore a timing path using `set_false_path`.


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