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 ELC D-flip flop characterization problem 

Last post Thu, Jul 11 2013 12:49 PM by rijudg. 0 replies.
Started by rijudg 11 Jul 2013 12:49 PM. Topic has 0 replies and 508 views
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  • Thu, Jul 11 2013 12:49 PM

    • rijudg
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    • Joined on Thu, Jul 11 2013
    • Posts 1
    • Points 5
    ELC D-flip flop characterization problem Reply

    I am trying to characterize the DFSR (Set reset flip flop) using the Encounter User's Guide (Pages 192-193) version 12.0

    I have used the two bool file lines for cell recognition:  

    ([N7], [N1], [N4], [N6]) = DFSR(D,CP,!SD,!CD),

    (Q, QN) = ([N1], [N7]); 

     

    The test vectors ELC generates based on the above two lines do not match with the truth table for the flip flop in the user guide. As a result, the verificate stage fails in a lot of test vectors. 

    For example :

               CD  CP   D  SD  :  Q  QN  : N7  N4  N6  N1

     D0012:  1   R   0   1  :  R   F  :  F   0   1   R  : DELAY(CP)

    In this vector, as CP (clock) rises, data is 0, but the test vector expects output Q to rise as well. 

     

    Please advise

     

    • Post Points: 5
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Started by rijudg at 11 Jul 2013 12:49 PM. Topic has 0 replies.