题目:
解题:
bash
module top_module(clk,reset,in,out);
input clk;
input reset;
input in;
output out;
parameter A=0,B=1;
reg [1:0]current_state,next_state;
always@(posedge clk)begin
if(reset)
current_state=B;
else
current_state=next_state;
end
always@(*)begin
case(current_state)
A:next_state=(in==0)?B:A;
B:next_state=(in==0)?A:B;
endcase
end
assign out=(current_state==A)?0:1;
endmodule
结果正确: