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input clk,reset,din;
output reg dout;
localparam S0 = 3'b000,
S1 = 3'b001,
S2 = 3'b010,
S3 = 3'b011,
S4 = 3'b100;
reg [2:0] state;
always @(posedge clk or negedge reset) begin
if(!reset) begin
state <= S0;
end
else begin
case(state)
S0: begin
if(din)
state <= S1;
else
state <= S0;
end
S1: begin
if(~din)
state <= S2;
else
state <= S1;
end
S2: begin
if(din)
state <= S3;
else
state <= S0;
end
S3: begin
if(din)
state <= S1;
else
state <= S4;
end
S4: begin
if(din)
state <= S3;
else
state <= S0;
end
endcase
end
end
always @(state) begin
case(state)
S0:dout <=1'b0;
S1:dout <= 1'b0;
S2:dout <= 1'b0;
S3:dout <= 1'b0;
S4:dout <= 1'b1;
endcase
end
endmodule
`timescale 1ns/1ns
module test_bn_sd();
reg clk,reset,din;
wire dout;
sd1010_moore_over DUT(clk,reset,din,dout);
initial begin
clk = 0;
forever #5 clk = ~clk;
end
initial begin
reset = 0;din=0;
#10 reset=1;
#10 din=1;
#10 din=0;
#10 din=1;
#10 din=0;
#10 din=1;
#10 din=0;
end
endmodule
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