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as the subject says,
is not able to find any clock nets:
" **WARN: (ENCSYC-1188): Cannot select clock net - could not find it."
Although, I ran CTS in advance:
ckSynthesis -forceReconvergent -rguide par_$Utilisation/ctgen/$Entity.guide -report par_$Utilisation/reports/$Entity.ctsrpt createClockTreeSpec -output par_$Utilisation/$Entity.ctstch\ -bufferList $CT_BUFFER specifyClockTree -file par_$Utilisation/$Entity.ctstch
createSaveDir par_$Utilisation/ctgen ckSynthesis -forceReconvergent -rguide par_$Utilisation/ctgen/$Entity.guide -report par_$Utilisation/reports/$Entity.ctsrpt saveClockNets -output par_$Utilisation/ctgen/$Entity.ctsntf saveNetlist par_$Utilisation/ctgen/$Entity.v savePlace par_$Utilisation/ctgen/$Entity.place
I would be glad about any hints what to do.
It sounds like the clock net markings are getting purged from the database somehow. Try triaging it by querying the "isCTSClock" attribute on all the nets in the design after each step in your flow to see where they're getting removed:
encounter 11> dbGet top.nets.isCTSClock 1 1 1 0 0 0
I think you'll find that either tracing is malfunctioning somehow -or- some downstream command you're using before selectNet is purging the markings. Let us know if you find the problem and we'll get it repaired!
Hope this helps,Bob
In reply to Robert Dwyer:
thanks for your reply.I think the clock tree specification is not right because when I try to build the clock tree using
ckSynthesis -forceReconvergent -clk clk -rguide par_0.5/ctgen/entity.guide -report par_0.5/reports/entity.ctsrpt
I get the following error:
**ERROR: (ENCCK-725): The BufMaxTran 0.3 (ps) in the clock tree specification file for AutoCTSRootPin clk is too small to synthesize any valid clock.
Which value do I have to use for "BufMaxTran" ? I am not sure what this variable means.
My netlist was synthesized with 100 ns.
In reply to marten:
BufMaxTran is the target transition time you're asking the tool to achieve on buffers in the clock tree. You probably don't want 0.3ps. You probably want 0.3ns. Try supply the units (ns) in your clock tree spec file where 0.3 is specified for BufMaxTran. If you're not specifying this value and it's defaulting to that try specifying it to 0.3ns.
Hope this helps,Bob
Thanks Bob, it is working now!