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1 | // ========== Copyright Header Begin ========================================== |
2 | // | |
3 | // OpenSPARC T2 Processor File: tx_byte_counter.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 : tx_byte_counter.v | |
40 | * Author Name : John Lo | |
41 | * Description : | |
42 | * Parent Module: xmac | |
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 | * | |
51 | * Modification : | |
52 | * | |
53 | * Synthesis Notes: | |
54 | * | |
55 | ******************************************************************/ | |
56 | ||
57 | module tx_byte_counter ( | |
58 | tx_clk, | |
59 | tx_reset, | |
60 | last_byte_position, | |
61 | eop_tag, | |
62 | tx_byte_count_en, | |
63 | // outputs | |
64 | tx_byte_count, | |
65 | nx_tx_byte_count | |
66 | ); | |
67 | ||
68 | input tx_clk; | |
69 | input tx_reset; | |
70 | input [2:0] last_byte_position; | |
71 | input eop_tag; | |
72 | input tx_byte_count_en; | |
73 | output [13:0] tx_byte_count; | |
74 | output [13:0] nx_tx_byte_count; | |
75 | ||
76 | reg [13:0] nx_tx_byte_count; | |
77 | ||
78 | always @ (tx_byte_count_en or eop_tag or tx_byte_count or last_byte_position) | |
79 | if (tx_byte_count_en) | |
80 | casex (eop_tag) // synopsys parallel_case full_case | |
81 | 1'b0: nx_tx_byte_count = tx_byte_count + 8; // in the middle of xfr | |
82 | 1'b1: nx_tx_byte_count = tx_byte_count + 1 + {11'b0,last_byte_position}; | |
83 | endcase // casex({eop_tag}) | |
84 | else nx_tx_byte_count = tx_byte_count ; | |
85 | ||
86 | ||
87 | // We can only support 16k jumbo packet | |
88 | RegRst #(14) tx_byte_count_RegRst ( | |
89 | .clk(tx_clk), | |
90 | .reset(tx_reset), | |
91 | .din(nx_tx_byte_count), | |
92 | .qout(tx_byte_count)); | |
93 | ||
94 | endmodule // tx_byte_counter | |
95 |