Dracula LVS question

Discussion in 'Cadence' started by The Master, Oct 23, 2007.

  1. The Master

    The Master Guest

    I am trying to run a Dracula LVS job, but I keep getting these weird LVS
    errors that I have no idea what is going on. Here is one sample.


    ?DEV8 MOS P ---- XMPPD-MM0 : ***** UN-MATCHED *****
    BYPH, ?VDD, NET0117
    ***** UN-MATCHED ***** : ?DEV7 MOS P
    : X=503.00 Y=5780.50
    BYPH, VDD!, NET0117


    So I add to the existing .EQUIV statement: VDD=VDD!


    ?DEV8 MOS P ---- XMPPD-MM0 : ***** UN-MATCHED *****
    BYPH, ?VDD, NET0117
    ***** UN-MATCHED ***** : ?DEV7 MOS P
    : X=503.00 Y=5780.50
    BYPH, VDD, NET0117


    Now I'm stumped. The .EQUIV should resolve this, right? If I'm reading
    this correctly, schematic side wants a net VDD but cannot find it in
    layout. Layout side there is a device that has VDD but there is no
    schematic reference for it at all...

    I have looked at the device, and it looks fine. Any clues as to what is
    going on?
     
    The Master, Oct 23, 2007
    #1
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