题解 | #脉冲同步器（快到慢）#
脉冲同步器（快到慢）
https://www.nowcoder.com/practice/9f7c92635b5f49579e8e38fd8c8450d7
`timescale 100ps/100ps
module pulse_detect(
input clka ,
input clkb ,
input rst_n ,
input sig_a ,
output sig_b
);
reg Sa;
always@(posedge clka or negedge rst_n) begin
if(!rst_n) begin
Sa <= 1'b0;
end
else begin
Sa <= sig_a?(~Sa):Sa;
end
end
reg Sb_r1,Sb_r2,Sb_r3;
always@(posedge clkb or negedge rst_n) begin
if(!rst_n) begin
{Sb_r1,Sb_r2,Sb_r3} <= 'd0;
end
else begin
{Sb_r1,Sb_r2,Sb_r3} <= {Sa,Sb_r1,Sb_r2};
end
end
assign sig_b = Sb_r2^Sb_r3;
endmodule
