用verilog写一个数据位宽为512bit的axi读写接口
时间: 2024-06-08 13:11:18 浏览: 19
以下是一个简单的512位宽AXI读写接口的Verilog代码:
```
module axi_interface(
input wire clk,
input wire reset,
input wire [31:0] addr,
input wire [511:0] write_data,
input wire write_enable,
output reg [511:0] read_data
);
reg [31:0] awaddr;
reg [31:0] araddr;
reg [1:0] awprot;
reg [1:0] arprot;
reg [2:0] awsize;
reg [2:0] arsize;
reg [7:0] awlen;
reg [7:0] arlen;
reg [31:0] wdata;
reg [7:0] wstrb;
reg [7:0] awid;
reg [7:0] arid;
reg [1:0] bresp;
reg [511:0] rdata;
reg [1:0] rresp;
reg awvalid;
reg wvalid;
reg arvalid;
reg rvalid;
reg bvalid;
reg [31:0] awaddr_reg;
reg [31:0] araddr_reg;
reg [511:0] rdata_reg;
reg [1:0] rresp_reg;
reg bvalid_reg;
reg rvalid_reg;
parameter IDLE = 3'b000;
parameter WAIT_FOR_WRITE_RESPONSE = 3'b001;
parameter WAIT_FOR_READ = 3'b010;
parameter WAIT_FOR_READ_RESPONSE = 3'b011;
parameter WAIT_FOR_WRITE = 3'b100;
parameter WAIT_FOR_WRITE_ADDRESS_PHASE = 3'b101;
reg [2:0] state;
reg [31:0] count;
assign read_data = rdata_reg;
always @(posedge clk) begin
if (reset) begin
state <= IDLE;
count <= 0;
bvalid_reg <= 0;
rvalid_reg <= 0;
end
else begin
case (state)
IDLE: begin
if (write_enable) begin
state <= WAIT_FOR_WRITE_ADDRESS_PHASE;
end
else begin
state <= WAIT_FOR_READ;
end
end
WAIT_FOR_WRITE_ADDRESS_PHASE: begin
awaddr <= addr;
awvalid <= 1;
awprot <= 0;
awsize <= 3'b111;
awlen <= 0;
awid <= 0;
state <= WAIT_FOR_WRITE_RESPONSE;
end
WAIT_FOR_WRITE_RESPONSE: begin
if (wvalid) begin
wdata <= write_data;
wstrb <= 16'hFFFF;
bvalid <= 1;
awvalid <= 0;
wvalid <= 0;
state <= IDLE;
end
end
WAIT_FOR_READ: begin
araddr <= addr;
arvalid <= 1;
arprot <= 0;
arsize <= 3'b111;
arlen <= 0;
arid <= 0;
state <= WAIT_FOR_READ_RESPONSE;
end
WAIT_FOR_READ_RESPONSE: begin
if (rvalid) begin
rdata_reg <= rdata;
rresp_reg <= rresp;
rvalid_reg <= 1;
arvalid <= 0;
rvalid <= 0;
state <= IDLE;
end
end
endcase
if (bvalid_reg && !write_enable) begin
bvalid_reg <= 0;
end
if (rvalid_reg && write_enable) begin
rvalid_reg <= 0;
end
if (bvalid) begin
count <= count + 1;
end
if (count == 1) begin
bvalid_reg <= 1;
count <= 0;
bresp <= 0;
end
if (rvalid) begin
count <= count + 1;
end
if (count == 1) begin
rvalid_reg <= 1;
count <= 0;
end
end
end
endmodule
```
这个接口有一个32位宽的地址端口,512位宽的写数据端口和一个写使能信号,以及一个512位宽的读数据端口。
该接口内部实现了AXI总线的读写协议。它包括一个状态机,用于管理读写交互,并实现了AXI总线的响应协议。在写入时,它将等待地址相应,然后将数据写入总线。在读取时,它将等待地址相应,然后读取数据。
请注意,这只是一个简单的实现,可能需要根据实际需求进行修改和优化。
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