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spectre syntax

KOTB

Hello,

When I want to skip list of instances having the same name  with just the index number changing I must declare each instance separately

opt2 options skip=cut  inst=[X8SEG\<0\>.XSEG\<7\>   X8SEG\<0\>.XSEG\<6\>   X8SEG\<0\>.XSEG\<5\>   X8SEG\<0\>.XSEG\<4\>   X8SEG\<0\>.XSEG\<3\>   X8SEG\<0\>.XSEG\<2\>   X8SEG\<0\>.XSEG\<1\>]

Instead of entering the instances to be skipped one by one, I want to skip them all by using this command line :

opt2 options skip=cut  inst= [ X8SEG\<0\>.XSEG\<1:7\>  ]

i obtain this ERROR :

 Internal error found in spectre during circuit read-in.
Encountered a critical error during simulation. Submit a Service Request via Cadence Online Support, including the netlist, the Spectre log file, the behavioral model files, and any other information that can help identify the problem.
FATAL (SPECTRE-18): Segmentation fault.

Could you please tell me how to skip all of them without having to put each instance path separably.

thanks,

kotb

  • There's no such thing as a bus in spectre, but you can use wildcards. So you could use:

    opt2 options skip=cut  inst=[ X8SEG\<0\>.XSEG\<*\>  ]

    Or if it's all instances of the same subckt (say called SEG), you can do:

    opt2 options skip=cut  subckt=[SEG]

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Thanks Andrew,

    I am aware of your proposed solution. But usually we want to skip some blocks and kip only one. Let's say I want to skip XSEG<0:510> and keep XSEG<511>.

    If I use the proposed solution I will skip all of them, even the one I want to keep. And it is not practical at all if I have to cite every instance that need to be skipped inst=[XSEG<0>, [XSEG<1>,....[XSEG<510>].

    Is there a for loop in spectre to do so ? or a 'keep' option where I skip all instances XSEG and keep only XSEG<511>  ?

  • in reply to KOTB

    There's no for loop, and no "keep" as such, but you can do (say - I'll leave you to give the full hierarchical name):

    mySkipOpts options skip=cut inst=[XSEG\<*\>]
    myKeepOpts options skip=none inst=[XSEG\<511\>]

    The wildcard first cuts all instances, but then you turn off the skip for a specific instance to keep it. I tried this with a simple example and it appeared to work OK.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Thanks Andrew, very smart idea ! 

    When using ultrasim can I find the same feature for this keep options ?

    What are the command lines that I should use ?

    Thanks again,

    Regards,

    kotb

  • in reply to KOTB

    usim_opt skip=2 inst=[m*]
    usim_opt skip=0 inst=[m2]

    (you can also use skip=1 for the "load" option - that you mentioned in your other post).

    Andrew.

  • in reply to Andrew Beckett

    Great !

    Thanks Andrew, you are making my flow wonderful !

    Regards,

    kotb

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