$dffsre#
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Simulation model (Verilog)#
module \$dffsre (CLK, SET, CLR, EN, D, Q);
parameter WIDTH = 0;
parameter CLK_POLARITY = 1'b1;
parameter SET_POLARITY = 1'b1;
parameter CLR_POLARITY = 1'b1;
parameter EN_POLARITY = 1'b1;
input CLK, EN;
input [WIDTH-1:0] SET, CLR, D;
output reg [WIDTH-1:0] Q;
wire pos_clk = CLK == CLK_POLARITY;
wire [WIDTH-1:0] pos_set = SET_POLARITY ? SET : ~SET;
wire [WIDTH-1:0] pos_clr = CLR_POLARITY ? CLR : ~CLR;
genvar i;
generate
for (i = 0; i < WIDTH; i = i+1) begin:bitslices
always @(posedge pos_set[i], posedge pos_clr[i], posedge pos_clk)
if (pos_clr[i])
Q[i] <= 0;
else if (pos_set[i])
Q[i] <= 1;
else if (EN == EN_POLARITY)
Q[i] <= D[i];
end
endgenerate
endmodule
Note
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help $dffsre
.