写一个udp verilog
时间: 2023-10-30 13:05:03 浏览: 36
下面是一个简单的UDP Verilog实现,用于接收和发送数据包:
```verilog
module udp (
input clk, rst,
input [31:0] src_ip, dest_ip,
input [15:0] src_port, dest_port,
input [15:0] length,
input [7:0] data_in,
output [31:0] data_out,
output valid, ready
);
parameter HEADER_SIZE = 8;
parameter MAX_PAYLOAD_SIZE = 1472;
typedef enum logic [1:0] {
IDLE, RECEIVE, TRANSMIT
} state_t;
state_t state;
logic [31:0] local_ip;
logic [31:0] remote_ip;
logic [15:0] local_port;
logic [15:0] remote_port;
logic [15:0] payload_length;
logic [31:0] rx_data;
logic [7:0] tx_buffer[MAX_PAYLOAD_SIZE];
logic [15:0] tx_length;
logic [15:0] tx_ptr;
logic [15:0] rx_ptr;
logic [31:0] checksum;
// Receive logic
always @(posedge clk) begin
if (rst) begin
state <= IDLE;
rx_ptr <= 0;
end else begin
case (state)
IDLE: begin
if (valid && (dest_ip == local_ip) && (dest_port == local_port)) begin
state <= RECEIVE;
rx_ptr <= 0;
checksum <= 0;
end else if (ready) begin
state <= TRANSMIT;
tx_ptr <= 0;
tx_length <= length;
checksum <= 0;
end
end
RECEIVE: begin
if (rx_ptr < payload_length) begin
rx_data <= data_in;
tx_buffer[rx_ptr] <= rx_data;
checksum <= checksum + rx_data;
rx_ptr <= rx_ptr + 1;
end else begin
state <= IDLE;
valid <= 0;
end
end
TRANSMIT: begin
if (tx_ptr < tx_length) begin
data_out <= tx_buffer[tx_ptr];
tx_ptr <= tx_ptr + 1;
end else begin
state <= IDLE;
ready <= 1;
end
end
endcase
end
end
// Transmit logic
always @(posedge clk) begin
if (rst) begin
payload_length <= 0;
end else begin
if (state == TRANSMIT && ready) begin
payload_length <= tx_length;
end
end
end
// Checksum calculation
always @(posedge clk) begin
if (rst) begin
checksum <= 0;
end else begin
if (state == RECEIVE && rx_ptr < payload_length) begin
checksum <= checksum + data_in;
end
if (state == TRANSMIT && tx_ptr < tx_length) begin
checksum <= checksum + tx_buffer[tx_ptr];
end
end
end
endmodule
```
这个模块包含了一个状态机,用于处理接收和发送数据包。`valid`和`ready`信号用于控制数据的流动。`data_in`和`data_out`信号用于传输数据。`src_ip`,`dest_ip`,`src_port`,`dest_port`和`length`信号分别表示发送方和接收方的IP地址、端口号和数据长度。`data_in`信号包含了接收到的数据,`data_out`信号包含了要发送的数据。`tx_buffer`数组用于存储发送的数据。`checksum`信号用于计算数据的校验和。