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Bob, How can I constrain optDesign -hold to add buffers on end points only?

eminemshow

Bob,

Things are like this, I am now at the final stage of timing closure, since functional timing is clean and test timing is ongoing. There is not enough time to config a MMMC environment. After investigation, I found that if I can add all the hold buffers at SI pin of DFF at scan shift mode, then functional timing would be un-touched (as you know, at Q pin of DFF, things would be dangerous......). So I want to ask whether I can control optDesign to make end-point only buffer insertion when fixing hold.

Thanks.

Parents

  • Bob,

    Yet another weird problem, I remember that since SOCE 52, the drouteUseMinSpacingForBlockage false is effective in NanoRoute......it tells NR that blockages in cells must be treated as 'wide metal', then more spacing is needed. But in this SOC81, after the design is wired, I found a lot of spacing errors between certain wire and cell blockages in hard macros in Calibre. But SOCE itself using verifyGeometry report nothing.....please help on this.

    Thanks.

Reply

  • Bob,

    Yet another weird problem, I remember that since SOCE 52, the drouteUseMinSpacingForBlockage false is effective in NanoRoute......it tells NR that blockages in cells must be treated as 'wide metal', then more spacing is needed. But in this SOC81, after the design is wired, I found a lot of spacing errors between certain wire and cell blockages in hard macros in Calibre. But SOCE itself using verifyGeometry report nothing.....please help on this.

    Thanks.

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