/**************************************************************/
/*    Verilog module of datapath cell dpdff0101              */
/*    Designed by  Linda J. Xu       Compass    Nov. 23, 1992 */
/*                                                            */
/*    The following is the port description                   */
/*    Data ports                                              */
/*        D    : the input port                               */
/*        Q    : the output port                              */
/*    Control ports                                           */
/*        INST_CP    : the clock signal                       */
/*    Parameters                                              */
/*        WORDSIZE  : the word size of the datapath cell      */
/*        DELAY     : the delay time from input to output     */
/*                                                            */
/*    When the clock signal changes from unknown to 1 or      */
/*        from 0 to unknown, the output will be unknown.      */
/**************************************************************/
module dpdff0101(D, Q, INST_CP);

  parameter WORDSIZE = 8, DELAY = 4, BF = 1;
  input  [WORDSIZE-1:0] D;
  output [WORDSIZE-1:0] Q;
  input  INST_CP;

  reg    [WORDSIZE-1:0] Q;
  reg    flag ;

  initial
     begin
         Q = {WORDSIZE{1'bx}};
         flag = 0;
     end

  always @ ( posedge INST_CP )
    if ((INST_CP === 1'b1) && (flag === 1'b0))
      Q = #DELAY ~(~D);
    else
      begin
        Q = {WORDSIZE{1'bx}};
        flag = 1'b1;
      end

  always @ (negedge INST_CP)
    if (INST_CP === 1'b0)
      flag = 1'b0;
    else
      flag = 1'b1;

endmodule