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TimeQuest comes back and tells me that the SDC command get_pins returns an empty value. I can determine the where the signal is at in the Technology Map Viewer, but how do I determine the correct path (and syntax) to place in the SDC file?
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I use the Name Finder to be sure the name is correct. You can get to the Name Finder from inside other TimeQuest dialog boxes or at "View --> Name Finder".
Even if I want the exact node name in the SDC command, I usually start by typing a portion of the name I'm confident is correct and use wildcards for the rest. For wildcards with get_pins and get_cells, enable the "Compatibility mode" checkbox in the Name Finder dialog box or read the on-line help for get_pins or get_cells to learn the special wildcard rules for those collections.
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Also, since the SDC file is used for timing-driven pnr, as well as post-route timing analysis, wouldn't it make since to use two different types of SDC files, one for pnr and one for timing analysis?
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You are free to use whatever .sdc file(s) you want to report timing after compilation completes, but usually you use the same timing constraints for the Fitter and for reporting.
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