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 q,q_reg1,q_reg2,q_reg3;
//高电平检测
always @(posedge clka or negedge rst_n)
if(!rst_n)
q <= 0;
else if(sig_a)
q <= ~q;
else
q <= q;
//两级寄存器触发
always@ (posedge clkb or negedge rst_n)
if(!rst_n)begin
q_reg1<=0;
q_reg2<=0;
end
else begin
q_reg1<=q;
q_reg2<=q_reg1;
end
//边沿检测
always@ (posedge clkb or negedge rst_n)
if(!rst_n)
q_reg3<=0;
else
q_reg3 <= q_reg2;
wire sig_b;
assign sig_b = q_reg2 ^q_reg3;
endmodule
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