Challenge with DIVA

Discussion in 'Cadence' started by Guenther Sohler, May 20, 2008.

  1. Guenther Sohler

    Guenther Sohler Guest

    I like to write a DIVA script to check for lonesome/orphanded/unused
    wires.

    I like to check that every wire is connected at least 2 times
    eg(two via1 in seperate places, or via1 and via2)

    I have written this code:


    M1_M2=geomAnd(M1 M2)
    M1_M2_V1=geomOverlap(M1_M2 V1)

    M2_M3=geomAnd(M2 M3)
    M2_M3_V2=geomOverlap(M2_M3 V2)

    M2_Conn=geomCat(M1_M2_V1 M2_M3_V2)

    M2_Err=geomOr(geomEnclose(M2 M2_Conn keep<=1) geomAvoiding(M2 M2_Conn) )

    saveDerived(M2_Err "M2 Island found")

    This does not flag M2 wires if they are really connected at two diffent
    places with M1
    But if M2 is connected once with VIA1 and VIA2, the connection polygons
    are counted as one, so the tool thinks there is only one connection and
    still flags an error.

    Does anybody know how to make it working ?
     
    Guenther Sohler, May 20, 2008
    #1
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