5 Replies Latest reply on Jun 7, 2012 6:23 AM by chris_balcom

    LVS issue when "OEN"port of Bi-direction IO tie to "VDD"

    51tz

      Hi Guys,

       

      There is bi-direction type IO in the design. Some needs to tie "OEN" port to VDD net. After LVS check, Calibre reports as below:

       

      Layout                                         Source

      *************************************************************

      Net: VDD                                     VDD

      ** Missing Connection **               Xpad_A: OEN

      ** Missing Connection **               Xpad_B: OEN

      ** Missing Connection **               Xpad_C: OEN

      ** Missing Connection **               Xpad_D: OEN

      ** Missing Connection **               Xpad_E: OEN

       

      I got confused, as source appears "OEN=VDD" in PINS statement of subckt, why it failed consequentlly?

       

      By the way, "Port" and "Instance" of top cell matches!