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RE: SDF generation problem

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Hello Kari,

I’m trying to generate an SDF file in Encounter for backannotation, using the Timing>Calculate Delay command. My problem is that the resulting SDF file has the same value for min, typ and max delays, for example:

(INTERCONNECT I1/I0/I16/Z I1/I0/I14/A1 (0.0003:0.0003:0.0003) (0.0003:0.0003:0.0003))

Or

(CELL

  (CELLTYPE "CKND2D2")

  (INSTANCE I1/I7/I18)

  (DELAY

    (ABSOLUTE

      (IOPATH A1 ZN (0.0247:0.0247:0.0247) (0.034:0.034:0.034))

      (IOPATH A2 ZN (0.0382:0.0382:0.0382) (0.0464:0.0464:0.0464))

    )

  )

)

This is true for both SignalStorm and Encounter’s Delay Calculator. I tried to change the PVT conditions with setOpCond BCCOM | WCCOM | NCCOM but I’m getting the same numbers.

Please assist me with this. Thank you in advance.

 
Best regards,

Alex

IC Design Engineer
Parents

  • Hi Alex,

    I don't use SDF that much, so I'm not the expert on this. Hopefully someone else will chime in to correct me if needed. You don't say much about your setup, but I believe you have to use MMMC in order to get SDF triplet values. Then, you would use the write_sdf command to output the sdf like this:

          write_sdf -min_view v1 –typ_view v2 –max_view v3 triCorner.sdf

    In this example, the view names v1, v2, and v3 are defined when you set up your MMMC analysis views. For more information on MMMC and setting up analysis views, there is a section in the "Optimizing Timing" chapter of the SOCE User Guide, called "Specifying the MMMC Environment".

    Hopefully this helps.

    - Kari

Reply

  • Hi Alex,

    I don't use SDF that much, so I'm not the expert on this. Hopefully someone else will chime in to correct me if needed. You don't say much about your setup, but I believe you have to use MMMC in order to get SDF triplet values. Then, you would use the write_sdf command to output the sdf like this:

          write_sdf -min_view v1 –typ_view v2 –max_view v3 triCorner.sdf

    In this example, the view names v1, v2, and v3 are defined when you set up your MMMC analysis views. For more information on MMMC and setting up analysis views, there is a section in the "Optimizing Timing" chapter of the SOCE User Guide, called "Specifying the MMMC Environment".

    Hopefully this helps.

    - Kari

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