Verilog sdio slave 实现
时间: 2023-08-20 14:04:07 浏览: 330
好的,下面是一些Verilog实现SDIO Slave接口的示例代码:
```
module sdio_slave(
input wire clk, //时钟信号
input wire rst, //复位信号
input wire cmd_en, //命令使能信号
input wire [47:0] cmd, //命令数据
input wire data_en, //数据使能信号
input wire [7:0] data, //数据信号
output wire busy, //忙信号
output reg [7:0] resp //响应信号
);
//定义SDIO协议的状态机
reg [2:0] state = 0;
//定义SDIO协议的命令
reg [5:0] cmd_reg = 0;
reg [31:0] arg_reg = 0;
//定义数据传输的状态机
reg [1:0] data_state = 0;
//定义SDIO数据缓冲区
reg [7:0] data_buf [511:0];
//定义SDIO数据计数器
reg [8:0] data_count = 0;
//定义SDIO响应计数器
reg [2:0] resp_count = 0;
//定义SDIO忙信号
reg busy = 0;
//定义SDIO响应信号
reg [7:0] resp_reg = 0;
always @(posedge clk or posedge rst) begin
if (rst) begin
state <= 0;
cmd_reg <= 0;
arg_reg <= 0;
data_count <= 0;
resp_count <= 0;
data_state <= 0;
busy <= 0;
resp_reg <= 0;
end else begin
case(state)
0: begin
//等待命令
if (cmd_en) begin
cmd_reg <= cmd[47:42];
arg_reg <= cmd[41:8];
state <= 1;
end
end
1: begin
//等待命令传输完成
if (!busy) begin
case(cmd_reg)
//处理CMD0命令
6'h00: begin
resp_reg <= 6'b010000;
resp_count <= 1;
state <= 0;
end
//处理CMD52命令
6'h34: begin
if (cmd[7]) begin
resp_reg[0] <= data_buf[cmd[5:0]];
resp_reg <= resp_reg;
end else begin
data_buf[cmd[5:0]] <= data;
end
resp_count <= resp_count + 1;
if (resp_count == 6) begin
resp_reg[7:1] <= 6'b010000;
state <= 0;
end
end
//处理其他命令
default: begin
resp_reg <= 6'b010000;
state <= 0;
end
endcase
end
end
endcase
end
end
always @(posedge clk or posedge rst) begin
if (rst) begin
data_state <= 0;
data_count <= 0;
end else begin
case(data_state)
0: begin
//等待数据
if (data_en) begin
data_state <= 1;
data_count <= 0;
busy <= 1;
end
end
1: begin
//接收数据
data_buf[data_count] <= data;
data_count <= data_count + 1;
if (data_count == 511) begin
busy <= 0;
data_state <= 2;
end
end
2: begin
//等待SDIO数据传输完成
if (!busy) begin
state <= 0;
resp_reg <= 6'b010000;
end
end
endcase
end
end
//输出SDIO响应信号
always @(posedge clk or posedge rst) begin
if (rst) begin
resp <= 0;
end else begin
resp <= resp_reg;
end
end
endmodule
```
上述代码实现了SDIO Slave接口的命令和数据传输。在实现过程中,使用了状态机来处理SDIO协议和数据传输,并使用缓冲区来存储SDIO数据。该代码可以供您参考,但需要根据您的具体需求进行调整和修改。
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