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  3. Routing info in Cadence Encounter

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Routing info in Cadence Encounter

Calistudent
Calistudent over 16 years ago

Hello,

 After running Cadence Encounter, if I want to find out routing and layer information about particular nets, which report files should I use ? Which files will contain this info.

 Thanks in advance,

Nil.

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  • Scrivner
    Scrivner over 16 years ago

     You can find the length of a net using the command getNetWireLength <netName>. You can also get connectivity information from the command report_net -net <netName>. I don't know if there's a built in command that gives layer info on a specific net though.

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  • Calistudent
    Calistudent over 16 years ago

    Won't the DEF file generated at the end have layer and connectivity info for each net ?

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  • Scrivner
    Scrivner over 16 years ago

    Yes you can search the DEF file to get the layer and connectivity info. I thought you were asking for a command that would generate a formatted report.

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  • jgentry
    jgentry over 16 years ago

    I don't know of any built-ins that will report that specific of information but it is all attainable from the Tcl interface.  Let me know if you want to pursue this route and I can throw down some sample code (I'm not at my work computer right now).  Something to do with dbForEachNetWire or something.

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  • BobD
    BobD over 16 years ago

    Great suggestions here so far- thanks a lot to the customers helping out!

    A couple of additional options I'd offer up for your consideration:

    • Have a look at the reportWire command.  Here is some sample output:
      ratio     wire_length   manhattan    vias  fanIn  fanOut net_name
                              length
      -------------------------------------------------------------------------
      1.08 Total  177.090     164.16 Total  4     1      1   dOut2[1]
         M1         7.650       V01   0
         M2       103.440       V12   2
         M3        66.000       V23   2
         M4         0.000       V34   0
         M5         0.000       V45   0
         M6         0.000       V56   0
    • You could use dbGet to query information about wire segments.  For example, if you wanted to know the layer of each wire segment for a given net:

      encounter 34> dbGet [dbGet -p top.nets.name tdsp_portO[14]].wires.layer.name
      M6 M6 M2 M3 M3 M4 M6 M5

    More information on getting started with dbGet can be found in this blog entry by Kari Summers.

    Hope this helps!
    Bob

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  • Javadb
    Javadb over 10 years ago

    Hello,

    Could you please give me more details on how to use reportWire?

    Thanks,

    Javad

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