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clockRouting, selectNet -allDefClock cannot find any clock

marten

Hi there,

 as the subject says,

 selectNet -allDefCloc

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.


Cheers,

Marten

 

Parents

  •  Hi Bob,

     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.

     

    Cheers,

    Marten 

     

Reply

  •  Hi Bob,

     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.

     

    Cheers,

    Marten 

     

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