用verilog语言写一个rgmii 程序
时间: 2023-12-04 15:04:55 浏览: 98
RGMII(Reduced Gigabit Media Independent Interface)是一种通信接口标准,用于连接千兆位以太网MAC和PHY芯片。下面是一个简单的Verilog代码示例,实现了一个基本的RGMII接口:
```
module rgmii_interface (
input wire clk,
input wire reset,
input wire tx_en,
input wire [3:0] tx_d,
output reg tx_er,
output reg rx_dv,
output reg [3:0] rx_d,
output reg rx_er
);
// Internal signals
reg [3:0] tx_data;
reg tx_en_int;
reg tx_er_int;
reg rx_dv_int;
reg [3:0] rx_data;
reg rx_er_int;
// RGMII timing parameters
parameter t_rgmii_clk = 8; // RGMII clock period (ns)
parameter t_rgmii_skew = 2; // TXD/RXD skew (ns)
parameter t_rgmii_delay = 2; // TXD/RXD delay (ns)
// TX/RX clock generation
reg tx_clk;
reg rx_clk;
always @(posedge clk or posedge reset) begin
if (reset) begin
tx_clk <= 1'b0;
rx_clk <= 1'b0;
end else begin
tx_clk <= ~tx_clk;
rx_clk <= ~rx_clk;
end
end
// TX/RX data synchronization
reg [3:0] tx_d_sync;
reg [3:0] rx_d_sync;
always @(posedge tx_clk or posedge reset) begin
if (reset) begin
tx_d_sync <= 4'b0000;
end else begin
tx_d_sync <= tx_d;
end
end
always @(posedge rx_clk or posedge reset) begin
if (reset) begin
rx_d_sync <= 4'b0000;
end else begin
rx_d_sync <= rx_d;
end
end
// TX/RX enable signal synchronization
reg tx_en_sync;
reg rx_dv_sync;
always @(posedge tx_clk or posedge reset) begin
if (reset) begin
tx_en_sync <= 1'b0;
end else begin
tx_en_sync <= tx_en;
end
end
always @(posedge rx_clk or posedge reset) begin
if (reset) begin
rx_dv_sync <= 1'b0;
end else begin
rx_dv_sync <= rx_dv;
end
end
// TX/RX error signal synchronization
reg tx_er_sync;
reg rx_er_sync;
always @(posedge tx_clk or posedge reset) begin
if (reset) begin
tx_er_sync <= 1'b0;
end else begin
tx_er_sync <= tx_er_int;
end
end
always @(posedge rx_clk or posedge reset) begin
if (reset) begin
rx_er_sync <= 1'b0;
end else begin
rx_er_sync <= rx_er_int;
end
end
// TX/RX data delay
reg [3:0] tx_d_delay;
reg [3:0] rx_d_delay;
always @(posedge tx_clk or posedge reset) begin
if (reset) begin
tx_d_delay <= 4'b0000;
end else begin
tx_d_delay <= tx_d_sync;
end
end
always @(posedge rx_clk or posedge reset) begin
if (reset) begin
rx_d_delay <= 4'b0000;
end else begin
rx_d_delay <= rx_d_sync;
end
end
// TX enable signal delay
reg tx_en_delay;
always @(posedge tx_clk or posedge reset) begin
if (reset) begin
tx_en_delay <= 1'b0;
end else begin
tx_en_delay <= tx_en_sync;
end
end
// TX/RX error signal delay
reg tx_er_delay;
reg rx_er_delay;
always @(posedge tx_clk or posedge reset) begin
if (reset) begin
tx_er_delay <= 1'b0;
end else begin
tx_er_delay <= tx_er_int;
end
end
always @(posedge rx_clk or posedge reset) begin
if (reset) begin
rx_er_delay <= 1'b0;
end else begin
rx_er_delay <= rx_er_int;
end
end
// TX data driver
always @(posedge tx_clk) begin
if (tx_en_int) begin
tx_data <= tx_d_delay;
end else begin
tx_data <= 4'b0000;
end
end
// TX error signal driver
always @(posedge tx_clk) begin
if (tx_en_int) begin
tx_er <= tx_er_delay;
end else begin
tx_er <= 1'b0;
end
end
// RX data receiver
always @(posedge rx_clk) begin
rx_d <= rx_d_delay;
end
// RX enable signal driver
always @(posedge rx_clk) begin
rx_dv <= rx_dv_sync;
end
// RX error signal receiver
always @(posedge rx_clk) begin
rx_er_int <= rx_er_sync;
end
// TX enable signal generator
always @(posedge tx_clk) begin
if (tx_en_sync) begin
tx_en_int <= 1'b1;
end else begin
tx_en_int <= 1'b0;
end
end
// TX/RX error signal generator
always @(posedge tx_clk or posedge rx_clk) begin
if (tx_er_sync || rx_er_sync) begin
tx_er_int <= 1'b1;
rx_er_int <= 1'b1;
end else begin
tx_er_int <= 1'b0;
rx_er_int <= 1'b0;
end
end
endmodule
```
该代码包括了RGMII接口的TX和RX数据传输、时钟和使能信号生成、数据同步和延迟、错误检测和处理等功能。请注意,这只是一个基本的实现,实际应用中可能需要根据具体需求进行修改和优化。