This is a Moore state machine with two states, one input, and one output. Implement this state machine. Notice that the reset state is B.
This exercise is the same as fsm1s, but using asynchronous reset.
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module top_module(
input clk,
input areset, // Asynchronous reset to state B
input in,
output out);//
parameter A=0, B=1;
reg state, next_state;
always @(*) begin // This is a combinational always block
//宣告瞭這是一個組合邏輯電路
// State transition logic
case(state)
A:begin
if(in) begin
next_state=A;
end
else begin
next_state=B;
end
end
B:begin
if(in) begin
next_state=B;
end
else begin
next_state=A;
end
end
endcase
end
always @(posedge clk, posedge areset) begin // This is a sequential always block
//實現非同步復位
// State flip-flops with asynchronous reset
if(areset)begin
state<=B;
end
else begin
state<=next_state;
end
end
// Output logic
// assign out = (state == ...);
assign out=(state==B);
endmodule