1//
2// Copyright 2011 Ettus Research LLC
3// Copyright 2018 Ettus Research, a National Instruments Company
4//
5// SPDX-License-Identifier: LGPL-3.0-or-later
6//
7
8
9
10module simple_gemac
11  (input clk125, input reset,
12   // GMII
13   output GMII_GTX_CLK, output GMII_TX_EN, output GMII_TX_ER, output [7:0] GMII_TXD,
14   input GMII_RX_CLK, input GMII_RX_DV, input GMII_RX_ER, input [7:0] GMII_RXD,
15
16   // Flow Control Interface
17   input pause_req, input [15:0] pause_time_req, input pause_respect_en,
18
19   // Settings
20   input [47:0] ucast_addr, input [47:0] mcast_addr,
21   input pass_ucast, input pass_mcast, input pass_bcast, input pass_pause, input pass_all,
22
23   // RX Client Interface
24   output rx_clk, output [7:0] rx_data, output rx_valid, output rx_error, output rx_ack,
25
26   // TX Client Interface
27   output tx_clk, input [7:0] tx_data, input tx_valid, input tx_error, output tx_ack,
28
29   output [31:0] debug
30   );
31
32   localparam SGE_IFG 		     = 8'd12;  // 12 should be the absolute minimum
33
34   wire rst_rxclk, rst_txclk;
35   reset_sync reset_sync_tx (.clk(tx_clk),.reset_in(reset),.reset_out(rst_txclk));
36   reset_sync reset_sync_rx (.clk(rx_clk),.reset_in(reset),.reset_out(rst_rxclk));
37
38   wire [15:0] pause_quanta_rcvd;
39   wire        pause_rcvd, pause_apply, paused;
40
41   simple_gemac_tx simple_gemac_tx
42     (.clk125(clk125),.reset(rst_txclk),
43      .GMII_GTX_CLK(GMII_GTX_CLK), .GMII_TX_EN(GMII_TX_EN),
44      .GMII_TX_ER(GMII_TX_ER), .GMII_TXD(GMII_TXD),
45      .tx_clk(tx_clk), .tx_data(tx_data), .tx_valid(tx_valid), .tx_error(tx_error), .tx_ack(tx_ack),
46      .ifg(SGE_IFG), .mac_addr(ucast_addr),
47      .pause_req(pause_req), .pause_time(pause_time_req),  // We request flow control
48      .pause_apply(pause_apply), .paused(paused)  // We respect flow control
49      );
50
51   simple_gemac_rx simple_gemac_rx
52     (.reset(rst_rxclk),
53      .GMII_RX_CLK(GMII_RX_CLK), .GMII_RX_DV(GMII_RX_DV),
54      .GMII_RX_ER(GMII_RX_ER), .GMII_RXD(GMII_RXD),
55      .rx_clk(rx_clk), .rx_data(rx_data), .rx_valid(rx_valid), .rx_error(rx_error), .rx_ack(rx_ack),
56      .ucast_addr(ucast_addr), .mcast_addr(mcast_addr),
57      .pass_ucast(pass_ucast), .pass_mcast(pass_mcast), .pass_bcast(pass_bcast),
58      .pass_pause(pass_pause), .pass_all(pass_all),
59      .pause_quanta_rcvd(pause_quanta_rcvd), .pause_rcvd(pause_rcvd),
60      .debug(debug)
61      );
62
63   flow_ctrl_tx flow_ctrl_tx
64     (.rst(rst_txclk), .tx_clk(tx_clk),
65      .tx_pause_en(pause_respect_en),
66      .pause_quanta(pause_quanta_rcvd), // 16 bit value
67      .pause_quanta_val(pause_rcvd),
68      .pause_apply(pause_apply),
69      .paused(paused)
70      );
71
72endmodule // simple_gemac
73