用三段式状态机检测连续输出010010
时间: 2023-07-01 22:24:56 浏览: 42
好的,以下是一个使用三段式状态机检测连续输出010010的Verilog代码示例:
```
module fsm_010010 (
input clk, rst_n, data_in,
output reg detected
);
// 定义状态
typedef enum logic [1:0] {
IDLE,
S0,
S1,
S2,
S3,
S4,
DONE
} state_t;
// 定义状态寄存器和当前状态变量
reg [1:0] state_reg, state_next;
// 初始化状态
initial begin
state_reg = IDLE;
end
// 更新状态
always @ (posedge clk or negedge rst_n) begin
if (!rst_n) begin
state_reg <= IDLE;
end else begin
state_reg <= state_next;
end
end
// 定义状态转换逻辑
always @ (*) begin
case (state_reg)
IDLE: begin
detected = 0;
if (data_in == 0) begin
state_next = S0;
end else begin
state_next = IDLE;
end
end
S0: begin
if (data_in == 1) begin
state_next = IDLE;
end else begin
state_next = S1;
end
end
S1: begin
if (data_in == 0) begin
state_next = S2;
end else begin
state_next = IDLE;
end
end
S2: begin
if (data_in == 0) begin
state_next = S3;
end else begin
state_next = IDLE;
end
end
S3: begin
if (data_in == 1) begin
state_next = S4;
end else begin
state_next = IDLE;
end
end
S4: begin
if (data_in == 0) begin
detected = 1;
state_next = DONE;
end else begin
state_next = IDLE;
end
end
DONE: begin
state_next = IDLE;
end
endcase
end
endmodule
```
这个状态机有七个状态:IDLE、S0、S1、S2、S3、S4和DONE。在IDLE状态下,如果输入的data_in信号为0,那么状态会转换到S0;否则,状态会保持在IDLE状态。在S0状态下,如果data_in为1,则状态会转换回IDLE;否则,状态会转换到S1。在S1、S2、S3、S4状态下,分别检测data_in的值是否为010010对应的值,如果匹配,则状态会转换到DONE状态,并将输出信号detected设置为1;否则,状态会转换回IDLE状态。在DONE状态下,状态会转换回IDLE状态。