| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: rx_xgmii_intf.v |
| 4 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved |
| 5 | // 4150 Network Circle, Santa Clara, California 95054, U.S.A. |
| 6 | // |
| 7 | // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 8 | // |
| 9 | // This program is free software; you can redistribute it and/or modify |
| 10 | // it under the terms of the GNU General Public License as published by |
| 11 | // the Free Software Foundation; version 2 of the License. |
| 12 | // |
| 13 | // This program is distributed in the hope that it will be useful, |
| 14 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | // GNU General Public License for more details. |
| 17 | // |
| 18 | // You should have received a copy of the GNU General Public License |
| 19 | // along with this program; if not, write to the Free Software |
| 20 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | // |
| 22 | // For the avoidance of doubt, and except that if any non-GPL license |
| 23 | // choice is available it will apply instead, Sun elects to use only |
| 24 | // the General Public License version 2 (GPLv2) at this time for any |
| 25 | // software where a choice of GPL license versions is made |
| 26 | // available with the language indicating that GPLv2 or any later version |
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| 34 | // ========== Copyright Header End ============================================ |
| 35 | /*%W% %G%*/ |
| 36 | |
| 37 | /************************************************************************* |
| 38 | * |
| 39 | * File Name : rx_xgmii_intf |
| 40 | * Author Name : John Lo |
| 41 | * Description : This module if for rx xgmii interface. |
| 42 | * Parent Module: |
| 43 | * Child Module: |
| 44 | * Interface Mod: |
| 45 | * Date Created : 3/24/04 |
| 46 | * |
| 47 | * Copyright (c) 2020, Sun Microsystems, Inc. |
| 48 | * Sun Proprietary and Confidential |
| 49 | * |
| 50 | * Modification : |
| 51 | * |
| 52 | * Synthesis Notes: |
| 53 | * |
| 54 | *************************************************************************/ |
| 55 | |
| 56 | module rx_xgmii_intf ( |
| 57 | rx_clk, |
| 58 | // xgmii 32bit interface |
| 59 | xgmii_rxc, |
| 60 | xgmii_rxd, |
| 61 | // xgmii 64bit interfaceoutput |
| 62 | xgmii_rxc_8b, |
| 63 | xgmii_rxd_64b |
| 64 | ); |
| 65 | |
| 66 | input rx_clk; |
| 67 | // xgmii 32bit interface |
| 68 | input [3:0] xgmii_rxc; |
| 69 | input [31:0] xgmii_rxd; |
| 70 | // xgmii 64bit interfaceoutput |
| 71 | output [7:0] xgmii_rxc_8b; |
| 72 | output [63:0] xgmii_rxd_64b; |
| 73 | |
| 74 | wire rx_clk; |
| 75 | wire rx_clk_n; |
| 76 | wire [3:0] xgmii_rxc_reg_n; |
| 77 | wire [3:0] xgmii_rxc_reg; |
| 78 | wire [31:0] xgmii_rxd_reg_n; |
| 79 | wire [31:0] xgmii_rxd_reg; |
| 80 | wire [7:0] xgmii_rxc_8 = {xgmii_rxc_reg_n,xgmii_rxc_reg}; |
| 81 | wire [63:0] xgmii_rxd_64 = {xgmii_rxd_reg_n,xgmii_rxd_reg}; |
| 82 | wire [7:0] xgmii_rxc_8b; |
| 83 | wire [63:0] xgmii_rxd_64b; |
| 84 | |
| 85 | |
| 86 | /* -------------------- negative clock definition ------------- */ |
| 87 | |
| 88 | `ifdef USE_XGMII_INTF |
| 89 | assign rx_clk_n = ~rx_clk; |
| 90 | `else // !ifdef USE_XGMII_INTF |
| 91 | assign rx_clk_n = rx_clk; |
| 92 | `endif |
| 93 | /* ***************** normal data path ************************* */ |
| 94 | /* ----------------- xgmii pre statge registers --------------- */ |
| 95 | RegDff #(4) xgmii_rxc_reg_n_RegDff (.din(xgmii_rxc),.clk(rx_clk_n),.qout(xgmii_rxc_reg_n)); |
| 96 | RegDff #(4) xgmii_rxc_reg_RegDff (.din(xgmii_rxc),.clk(rx_clk ),.qout(xgmii_rxc_reg )); |
| 97 | RegDff #(32) xgmii_rxd_reg_n_RegDff (.din(xgmii_rxd),.clk(rx_clk_n),.qout(xgmii_rxd_reg_n)); |
| 98 | RegDff #(32) xgmii_rxd_reg_RegDff (.din(xgmii_rxd),.clk(rx_clk ),.qout(xgmii_rxd_reg )); |
| 99 | // convert to positive edge pipeline |
| 100 | |
| 101 | RegDff #(8) xgmii_rxc_8b_RegDff(.din(xgmii_rxc_8), .clk(rx_clk ),.qout(xgmii_rxc_8b)); |
| 102 | RegDff #(64) xgmii_rxd_64b_RegDff(.din(xgmii_rxd_64),.clk(rx_clk ),.qout(xgmii_rxd_64b)); |
| 103 | |
| 104 | endmodule // rx_xgmii_intf |
| 105 | |