| 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 |
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| 28 | // otherwise unspecified. |
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| 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 | |