verilog语言的秒表设计代码
时间: 2023-09-24 20:09:20 浏览: 67
好的,以下是一个基于 verilog 语言的秒表设计代码:
```
module stopwatch(
input clock, // 时钟信号
input start_stop, // 启动/停止按钮
input reset, // 复位按钮
output reg [31:0] count // 计数器
);
// 定义状态机枚举类型
typedef enum {INIT, COUNTING, PAUSED} state_type;
reg [1:0] state; // 状态寄存器
// 定义按钮的状态枚举类型
typedef enum {RELEASED, PRESSED, STABLE} button_type;
reg [1:0] start_stop_state; // 启动/停止按钮状态寄存器
reg [1:0] reset_state; // 复位按钮状态寄存器
// 定义状态机的状态转换
always @ (posedge clock) begin
case(state)
INIT: begin
count <= 0;
if (start_stop_state == PRESSED)
state <= COUNTING;
else
state <= INIT;
end
COUNTING: begin
if (start_stop_state == PRESSED)
state <= PAUSED;
else
state <= COUNTING;
end
PAUSED: begin
if (start_stop_state == PRESSED)
state <= COUNTING;
else
state <= PAUSED;
end
endcase
end
// 定义按钮状态检测
always @ (posedge clock) begin
// 检测启动/停止按钮状态
case(start_stop_state)
RELEASED: begin
if (start_stop == 1'b0)
start_stop_state <= RELEASED;
else
start_stop_state <= PRESSED;
end
PRESSED: begin
if (start_stop == 1'b1)
start_stop_state <= PRESSED;
else
start_stop_state <= RELEASED;
end
STABLE: begin
if (start_stop == 1'b1)
start_stop_state <= PRESSED;
else if (start_stop == 1'b0)
start_stop_state <= RELEASED;
else
start_stop_state <= STABLE;
end
endcase
// 检测复位按钮状态
case(reset_state)
RELEASED: begin
if (reset == 1'b0)
reset_state <= RELEASED;
else
reset_state <= PRESSED;
end
PRESSED: begin
if (reset == 1'b1)
reset_state <= PRESSED;
else
reset_state <= RELEASED;
end
STABLE: begin
if (reset == 1'b1)
reset_state <= PRESSED;
else if (reset == 1'b0)
reset_state <= RELEASED;
else
reset_state <= STABLE;
end
endcase
end
// 定义计数器
always @ (posedge clock) begin
if (reset_state == PRESSED)
count <= 0;
else if (state == COUNTING)
count <= count + 1;
end
endmodule
```
以上是一个简单的秒表设计代码,其中包括时钟信号、启动/停止按钮、复位按钮、计数器、状态机等组件。在这个代码中,状态机有3个状态:初始化状态(INIT)、计时状态(COUNTING)和暂停状态(PAUSED)。计数器每次加1,直到达到最大值后重新从0开始计数。通过按钮状态检测模块可以检测按钮的状态,并将状态信息传递给状态机,从而控制秒表的状态转换。