用verilog写一个spi读写数据 要求有读写ready valid信号
时间: 2024-03-08 07:49:21 浏览: 30
好的,我可以为您提供一个参考代码,但是由于代码与硬件平台相关,需要您在具体实现时根据自己的硬件环境进行修改。以下是一个简单的SPI读写模块,带有读写ready valid信号,您可以参考一下:
```verilog
module spi (
input rst_n,
input clk,
input [7:0] write_data,
output reg [7:0] read_data,
input write_valid,
output reg write_ready,
input read_valid,
output reg read_ready
);
// SPI状态定义
parameter IDLE = 2'b00;
parameter WRITE = 2'b01;
parameter READ = 2'b10;
reg [1:0] state = IDLE;
reg [7:0] spi_data;
reg [7:0] tx_data;
reg [7:0] rx_data;
reg cnt;
assign read_data = rx_data;
// 写数据状态机
always @(posedge clk or negedge rst_n)
begin
if (!rst_n) begin
state <= IDLE;
cnt <= 0;
spi_data <= 0;
tx_data <= 0;
rx_data <= 0;
write_ready <= 1'b0;
end
else begin
case (state)
IDLE: begin
if (write_valid) begin
tx_data <= write_data;
state <= WRITE;
end
write_ready <= 1'b1;
end
WRITE: begin
spi_data <= tx_data;
cnt <= 7;
state <= READ;
write_ready <= 1'b0;
end
READ: begin
spi_data <= {1'b0, spi_data[7:1]};
rx_data[cnt] <= spi_data[0];
cnt <= cnt - 1;
if (cnt == 0) begin
state <= IDLE;
write_ready <= 1'b1;
end
end
endcase
end
end
// 读数据状态机
always @(posedge clk or negedge rst_n)
begin
if (!rst_n) begin
state <= IDLE;
cnt <= 0;
spi_data <= 0;
tx_data <= 0;
rx_data <= 0;
read_ready <= 1'b0;
end
else begin
case (state)
IDLE: begin
if (read_valid) begin
state <= WRITE;
end
read_ready <= 1'b1;
end
WRITE: begin
spi_data <= 0xAA;
cnt <= 7;
state <= READ;
read_ready <= 1'b0;
end
READ: begin
spi_data <= {1'b0, spi_data[7:1]};
rx_data[cnt] <= spi_data[0];
cnt <= cnt - 1;
if (cnt == 0) begin
state <= IDLE;
read_ready <= 1'b1;
end
end
endcase
end
end
endmodule
```
在这个模块中,有一个状态机,用于控制读写操作,同时有读写的ready和valid信号。具体实现中,需要根据自己的硬件环境对信号进行修改,以保证模块的正确性。
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