用Verilog写一个16位的iic通讯协议

以下是一个简单的16位I2C通信协议的Verilog代码示例：

module i2c_master(
    input clk,
    input rst,
    output scl,
    inout sda
);

parameter IDLE = 4'b1111;
parameter START = 4'b1110;
parameter STOP = 4'b1101;
parameter ADDR_W = 4'b1100;
parameter ADDR_R = 4'b1011;
parameter DATA_W = 4'b1010;
parameter DATA_R = 4'b1001;

reg [3:0] state;
reg [7:0] data;
reg [3:0] addr;
reg ack;

assign scl = (state == IDLE || state == START || state == ADDR_W || state == ADDR_R || ack == 1);

assign sda = (state == IDLE) ? 1 :
             (state == START) ? 0 :
             (state == ADDR_W || state == ADDR_R) ? (addr[15:8] == 1) ? 1 : 0 :
             (state == DATA_W) ? (data[15:8] == 1) ? 1 : 0 :
             (state == DATA_R) ? ack :
             1;

always @(posedge clk)
begin
    if (rst)
        state <= IDLE;
    else
        case (state)
            IDLE:
                begin
                    state <= START;
                    ack <= 0;
                end
            START:
                begin
                    state <= (ack == 0) ? ADDR_W : 2'b0;
                    addr <= 16'b1010000000000000;
                end
            ADDR_W:
                begin
                    state <= (ack == 0) ? DATA_W : 2'b01;
                    data <= 16'b0000000000000000;
                end
            DATA_W:
                begin
                    state <= (ack == 0) ? STOP : 2'b10;
                    data <= 16'b1111111100000000;
                end
            2'b00:
                begin
                    state <= (ack == 0) ? STOP : ADDR_R;
                    addr <= 16'b1010000000000000;
                end
            ADDR_R:
                begin
                    state <= (ack == 0) ? DATA_R : 2'b01;
                    data <= 16'b0000000000000000;
                end
            DATA_R:
                begin
                    state <= IDLE;
                    ack <= 0;
                end
        endcase
end

always @(negedge scl)
begin
    if (state == IDLE)
        ack <= 0;
    else if (state == START)
        ack <= 1;
    else if (sda == 0)
        ack <= 0;
end

endmodule

这段代码实现了一个简单的I2C主机，可以向从机发送16个字节的数据。对于更复杂的通信协议，需要根据具体的需求进行修改。