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发表于 2010-4-14 12:49:33
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module dff_rs (reset, preset, data, q, qn, clk);
input clk;
input reset, preset, data;
output q, qn;
reg q;
assign qn = ~q;
always @ (posedge clk or negedge reset or posedge preset)
if (~reset)
q = 0'b1;
else if (preset)
q = 1'b0;
else q = data;
endmodule |
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