题解 | #根据状态转移写状态机-二段式#
根据状态转移写状态机-二段式
http://www.nowcoder.com/practice/5b2ff27610d04993ae92374d51bfc2e6
`timescale 1ns/1ns
module fsm2(
input wire clk ,
input wire rst ,
input wire data ,
output reg flag
);
//*************code***********//
parameter S0=3'b000,S1=3'b001,S2=3'b010,S3=3'b011,S4=3'b100;
reg [2:0] sta,nsta;
always@(posedge clk or negedge rst)
if(!rst)
sta <= S0;
else
sta <= nsta;
always@(*)begin
flag = 0;//初始化 就不用写那么多else了
case(sta)
S0:nsta = data?S1:S0;
S1:nsta = data?S2:S1;
S2:nsta = data?S3:S2;
S3:nsta = data?S4:S3;
S4:begin
nsta = data?S1:S0;
flag = 1;
end
default:nsta = S0;
endcase
end
//*************code***********//
endmodule
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