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 Dptol never goes green. 

Last post Mon, Nov 6 2006 11:21 AM by archive. 2 replies.
Started by archive 06 Nov 2006 11:21 AM. Topic has 2 replies and 690 views
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  • Mon, Nov 6 2006 11:21 AM

    • archive
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    Dptol never goes green. Reply

    When trying to adjust a differential pair using delay tune I sometimes have the problem that the Dptol window that is checking diffpair tolerance never goes green. It flops back and forth in the red from +x to -x and the tolerance never goes green. How do I fix this?

    Thanks!


    Originally posted in cdnusers.org by simpest
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  • Tue, Nov 7 2006 7:23 AM

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    RE: Dptol never goes green. Reply

    I had this problem once on release 15.2 I believe it has been fixed in 15.7

    In my case I had pin pairs defined in the differential pair coming in from the schematic with no pin use defined and on resistors and capacitors which also were defined in the wrong class "IC" apparently this confused the program. The work around was to change the class from IC to Dsicrete and then the DPTOL would calculate correctly.

    this is what R&D had to say about it:

    "The code does a bad match here, matching (R6.1:C9.1 with U41.5:C13.1)
    and (R15.1:C13.1 with U41.6:C9.1). The code has trouble separating short
    path nets with unspecified pinuses. Since the R* and C* are unspec and
    not discrete types, the pins are classified BI and can be both driver
    and receiver. Normally the code could separate thse, but in this case
    the pins are so close together that it is difficult to separate the sheep
    from the goats.
    "

    Hope this helps


    Originally posted in cdnusers.org by CTMusetti
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  • Tue, Nov 7 2006 10:09 AM

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    RE: Dptol never goes green. Reply

    Thanks! That was exactly the problem. I had a discrete component that was labled as an IO.

    -Jason


    Originally posted in cdnusers.org by simpest
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Started by archive at 06 Nov 2006 11:21 AM. Topic has 2 replies.