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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 | |
27 | // may be used, or where a choice of which version of the GPL is applied is | |
28 | // otherwise unspecified. | |
29 | // | |
30 | // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
31 | // CA 95054 USA or visit www.sun.com if you need additional information or | |
32 | // have any questions. | |
33 | // | |
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 |