主从数据通信的Verilog代码

以下是一个简单的Verilog代码示例，用于实现主从数据通信。它包含一个主机模块和一个从机模块，它们之间使用一组数据线和控制线进行通信。

主机模块：

module master (
    input clk,
    input reset,
    output reg data_out,
    output reg data_ready,
    input data_in,
    input data_ack
);
 
reg [7:0] data;
reg [2:0] state;
 
parameter IDLE = 0;
parameter SEND = 1;
 
always @(posedge clk) begin
    if (reset) begin
        data <= 0;
        state <= IDLE;
        data_out <= 0;
        data_ready <= 0;
    end else begin
        case (state)
            IDLE: begin
                if (data_ack) begin
                    // start sending data
                    state <= SEND;
                    data <= 8'hAB; // example data
                end
            end
            SEND: begin
                data_ready <= 1;
                if (data_ack) begin
                    // data acknowledged, move to next state
                    state <= IDLE;
                end
            end
        endcase
    end
end
 
assign data_out = data[0];
 
endmodule

从机模块：

module slave (
    input clk,
    input reset,
    output reg data_out,
    output reg data_ack,
    input data_in,
    input data_ready
);
 
reg [7:0] data;
reg [2:0] state;
 
parameter IDLE = 0;
parameter RECEIVE = 1;
 
always @(posedge clk) begin
    if (reset) begin
        data <= 0;
        state <= IDLE;
        data_out <= 0;
        data_ack <= 0;
    end else begin
        case (state)
            IDLE: begin
                if (data_ready) begin
                    // start receiving data
                    state <= RECEIVE;
                end
            end
            RECEIVE: begin
                data <= {data[6:0], data_in};
                if (data_ready) begin
                    // data received, acknowledge it
                    data_ack <= 1;
                    state <= IDLE;
                end
            end
        endcase
    end
end
 
assign data_out = data[7];
 
endmodule

这两个模块使用了相同的时钟信号和复位信号。主机模块在空闲状态下等待从机模块的数据确认信号，一旦收到确认信号，它开始发送数据。从机模块在空闲状态下等待主机模块的数据准备信号，一旦收到准备信号，它开始接收数据并发送确认信号。这里的数据传输仅限于一个字节，但可以轻松扩展以支持更多数据。