题解 | #根据状态转移写状态机-三段式#
根据状态转移写状态机-三段式
https://www.nowcoder.com/practice/d8394a6d31754e73ace8c394e9465e2a
`timescale 1ns/1ns module fsm1( input wire clk , input wire rst , input wire data , output reg flag ); //*************code***********// parameter S0 = 2'b00; parameter S1 = 2'b01; parameter S2 = 2'b10; parameter S3 = 2'b11; reg [1:0] c_state; reg [1:0] n_state; always@(posedge clk or negedge rst) begin if(!rst) begin c_state <= S0; end else begin c_state <= n_state; end end always @(*) begin if(!rst) begin n_state <= S0; end else begin case(c_state) S0: n_state <= (data == 1)? S1:S0; S1: n_state <= (data == 1)? S2:S1; S2: n_state <= (data == 1)? S3:S2; S3: n_state <= (data == 1)? S0:S3; endcase end end always @(posedge clk or negedge rst) begin if(!rst) begin flag <= 0; end else if (c_state == S3 && data == 1) begin flag <= 1; end else begin flag <= 0; end end //*************code***********// endmodule