Forum Discussion
Occasional ContributorFitter error due to 'get_combs' command in .sdc file
I am getting a fitter error caused by a 'get_combs' command in the .sdc file; the get_combs command is part of a create_generated_clock command:
-source [get_combs {blah_blah_blah\
|blah_blah_bla\
|blah_blah_bla\
|blah_blah_bla\
|altera_xcvr_10gkr_a10\
|CHANNEL\
|RX_CLK_MUX_LS.gf_rx_clk_mux_inst\
|reduce_or_0~0~la_mlab/laboutt[6]}]
The create_generated _clock command was automatically generated by Timing Analyzer; the chip built without issues before I added the SDC file. The SDC reference manual I have makes no mention of a 'get_combs' command.
I tied replacing the 'get_combs' with a 'get_pins', which seems to work (fitter is still running) but I don't know what effect that might have on the actual application of timing constraints. Any ideas? thanks.
14 Replies
KhaiChein_Y_IntelRegular Contributor
Hi,
May I know if you have any updates?
Thanks.
SeadogI can't say what IP (if any) caused it.
- KhaiChein_Y_Intel
Hi,
Could you share some simple steps to reproduce the error?
Thanks.
- KhaiChein_Y_Intel
Hi,
It would be difficult to duplicate the error if we cannot have the test case. Is this happened only for some IP?
Thanks.
- Seadog
I cannot post my design, so I would have to create something which has the same problem, and right now I don't have the spare time for that task.
- KhaiChein_Y_Intel
Hi,
Can you provide a sample test case to reproduce the error?
Thanks
- Seadog
no
sstrellSuper Contributor
Can you post your original .sdc?
#iwork4intel
- KhaiChein_Y_Intel
Hi,
Any updates?
Thanks.
-YY
- sstrell
I don't understand. Something in your design is generating this .sdc file? get_combs is not a valid collection. You say "any time Quartus/Timing Analyzer has occasion to write the .sdc file". Are you saying you're doing a "Write SDC" command in the timing analyzer to generate this or is it getting generated in some other way?
#iwork4intel
- Seadog
As you probably know, if you use the TA GUI to create a timing constraint, you can then cue TA to write out the updated .sdc file. When TA writes to the .sdc file, it is overwriting the edits I made to eliminate the offending 'get_combs' command. Then I have to manually edit the .sdc file, or Quartus errors out again when I try to do a build.
- KhaiChein_Y_IntelCan you share the error messages, steps to reproduce the error, the software edition (Pro/Standard/Lite) and the software version ?
