1 Reply Latest reply on Jan 8, 2018 10:10 AM by richa

    Tessent parallel presim fail, but serial pass

    dft_engineer

      Hi all,

       

      i get a case which stuck at scan pattern presim parallel  fail, but serial run pass,

      The following are the  waveform &  fail pattern ATPG good results.

       

      1. parallel presim cell A got mismatch in pink area,(sim = 0, exp=1)

      webwxgetmsgimg.jpg

      2. fail pattern ATPG : From this pic , we can see the D pin of cell A  is 100, but simulated value is 000, and mismatch come from cell B,

      webwxgetmsgimg (1).jpg

       

      3. serial presim:

      we can see serial result and ATPG is match(cell B get 1 after shift done)

      webwxgetmsgimg (2).jpg

       

      How can I debug the parallel presim mismatch?

      thank you.