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When I was liberating a DFF cell that has three outputs {Q QN Q1},I get the trouble

TH20240830782

The outputs {Q QN Q1},The QN and Q is a pair diff outputs . the liberate show me that there is no founction for this DFF cell;what should I do for this problem ! 

thanks for everyone

  • function attribute for sequential cells are generally defined by users according to the behavior of the cell and the requirement from STA tools. A stand FF with Q QN as outputs may have,

    cell (myFF)  {

    pin (Q) {

    function : "IQ" ;

    ...

    }

    pin (QN) {

    function : "IQN" ;

    ...

    }

    ff (IQ,IQN) {

    <example, but actual content depends on cell behavior>

    next_state : "D" ;
    clocked_on : "CLK" ;
    clear : "CLR’" ;
    preset : "PRE’" ;
    clear_preset_var1 : L ;
    clear_preset_var2 : L ;
    }

    }

    Guangjun

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