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Is there a way to fix the target net in propagation delay?

avant

I set clock nets as targets in relative propagation delay work sheet.

While reviewing, the target nets changed. Is there a way to fix the target?

Parents
  • steve
    0

    Yes - In the Delta:Tolerance cell for the net right click - Set as Target

  • Schulz Jordan
    0 in reply to steve

    The role of delta & tolerance is still confusing. When delta is set 0, the results will be different, when it set to nil the results are different. Aren't zero & nil value play same role ? It would be great if anyone could brief out delta & tolerance role.

Reply
  • Schulz Jordan
    0 in reply to steve

    The role of delta & tolerance is still confusing. When delta is set 0, the results will be different, when it set to nil the results are different. Aren't zero & nil value play same role ? It would be great if anyone could brief out delta & tolerance role.

Children
  • avant
    0 in reply to Schulz Jordan

    Delta refers to how much length to add or subtract from the target length.

    If I have a trace from a pin to say a pullup resistor that I do not want included in the length value, the delta would be the length of the trace to exclude it (positive value). It's a little confusing, you are actually increasing the target length of that particular net. This is an alternate to creating pin pairs and a net schedule. Tolerance is +/- the target length. 

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