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OrF's avatar
OrF
Icon for Occasional Contributor rankOccasional Contributor
1 year ago

Find where false_path was set.

Hi, I have a design where there is a physical path between two flip-flops (FF). However, when I try to generate a timing report, the Timing Analyzer shows “nothing to report.” I assume this might be...
Timing
sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
1 year ago

I'm not sure why this is referring to a .scf file (which I had to look up what that was, a simulator channel file?), but maybe that's why there are issues. This should be in a .sdc file.

  • OrF's avatar
    OrF
    Icon for Occasional Contributor rankOccasional Contributor
    1 year ago

    The .scf extension is what I used to apply my constraints. The constraints are in place, but I can change the file name or its extension if needed (see below). I created a test case, but it doesn’t seem to be expanding the wildcard, even after changing the file name.

    +-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
    ; Set False Path ;
    +----------------+-------+------------+------------------------+---------+----------+-------------------------------------------------------+----------------------------+----------+
    ; SDC Command ; Flags ; From Flags ; From ; Through ; To Flags ; To ; Location ; Comments ;
    +----------------+-------+------------+------------------------+---------+----------+-------------------------------------------------------+----------------------------+----------+
    ; set_false_path ; ; -from ; [get_clocks {rx_*}] ; ; -to ; [get_clocks {pll_*}] ; new.sdc:2 ; ;
    +----------------+-------+------------+------------------------+---------+----------+-------------------------------------------------------+----------------------------+----------+