| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: xrlm_sm.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 : xrlm_sm.v |
| 40 | * Author Name : John Lo |
| 41 | * Description : xgmii receive link manager state machine. |
| 42 | * Parent Module: rx_xmac |
| 43 | * Child Module: |
| 44 | * Interface Mod: many. |
| 45 | * Date Created : 5/9/00 |
| 46 | * |
| 47 | * Copyright (c) 2002, Sun Microsystems, Inc. |
| 48 | * Sun Proprietary and Confidential |
| 49 | * |
| 50 | * Modification : |
| 51 | * |
| 52 | * Synthesis Notes: |
| 53 | * |
| 54 | *************************************************************************/ |
| 55 | |
| 56 | module xrlm_sm ( |
| 57 | rx_clk, |
| 58 | rx_reset, |
| 59 | rx_enable_rxclk, |
| 60 | rx_data_valid_gmux, |
| 61 | rx_data_valid_gmux_lead,//rx_1st_word_time == rx_data_valid_gmux_lead |
| 62 | da_match_err, |
| 63 | rxfifo_full_rxclk, |
| 64 | rxfifo_afull_rxclk, |
| 65 | max_pkt_size_limit, |
| 66 | err_chk_dis, |
| 67 | link_fault, |
| 68 | // outputs |
| 69 | valid_data, |
| 70 | set_err_time, |
| 71 | eop, |
| 72 | rx_ok, |
| 73 | err_cond, |
| 74 | xrlm_state |
| 75 | ); |
| 76 | |
| 77 | |
| 78 | input rx_clk; |
| 79 | input rx_reset; |
| 80 | input rx_enable_rxclk; |
| 81 | input rx_data_valid_gmux; |
| 82 | input rx_data_valid_gmux_lead;//rx_1st_word_time == rx_data_valid_gmux_lead |
| 83 | input da_match_err; |
| 84 | input rxfifo_full_rxclk; |
| 85 | input rxfifo_afull_rxclk; |
| 86 | input max_pkt_size_limit; |
| 87 | input err_chk_dis; |
| 88 | input link_fault; |
| 89 | // outputs |
| 90 | output valid_data; |
| 91 | output set_err_time; |
| 92 | output eop; |
| 93 | output rx_ok; |
| 94 | output err_cond; |
| 95 | output xrlm_state; |
| 96 | |
| 97 | reg valid_data; |
| 98 | reg set_err_time; |
| 99 | reg eop; |
| 100 | reg nx_xrlm_state; |
| 101 | wire xrlm_state; |
| 102 | wire rx_ok,err_cond; |
| 103 | // rx_1st_word_time == rx_data_valid_gmux_lead |
| 104 | assign rx_ok = rx_data_valid_gmux_lead & !da_match_err & ~link_fault & |
| 105 | ~(rxfifo_afull_rxclk | rxfifo_full_rxclk) & rx_enable_rxclk; |
| 106 | |
| 107 | // There is no min_pkt_size_err,crc_err. Since rlm_sm won't be able |
| 108 | // to see them in time. |
| 109 | assign err_cond = link_fault | rxfifo_afull_rxclk | (~err_chk_dis & ( max_pkt_size_limit)); |
| 110 | |
| 111 | |
| 112 | parameter IDLE = 1'h0, |
| 113 | RX_BODY = 1'h1; |
| 114 | |
| 115 | // com part |
| 116 | always @ (xrlm_state or |
| 117 | rx_ok or rx_data_valid_gmux or |
| 118 | err_cond ) |
| 119 | begin |
| 120 | nx_xrlm_state= IDLE; |
| 121 | valid_data = 1'b0; |
| 122 | set_err_time = 1'b0; |
| 123 | eop = 1'b0; |
| 124 | |
| 125 | casex(xrlm_state) // synopsys parallel_case full_case |
| 126 | IDLE: |
| 127 | if (rx_ok) |
| 128 | begin |
| 129 | nx_xrlm_state= RX_BODY; |
| 130 | valid_data = 1; |
| 131 | end // if (rx_ok) |
| 132 | else |
| 133 | begin |
| 134 | nx_xrlm_state= xrlm_state; |
| 135 | valid_data = 0; |
| 136 | end // else: !if(rx_ok) |
| 137 | |
| 138 | RX_BODY: |
| 139 | begin |
| 140 | valid_data = 1; |
| 141 | if (err_cond) |
| 142 | begin |
| 143 | nx_xrlm_state= IDLE; |
| 144 | set_err_time = 1; |
| 145 | eop = 1; |
| 146 | valid_data = 0; |
| 147 | end // if (err_cond) |
| 148 | else if (~rx_data_valid_gmux) |
| 149 | begin |
| 150 | nx_xrlm_state= IDLE; |
| 151 | eop = 1; |
| 152 | valid_data = 0; |
| 153 | end // if (~rx_data_valid_gmux) |
| 154 | else |
| 155 | begin |
| 156 | nx_xrlm_state= RX_BODY; |
| 157 | valid_data = 1; |
| 158 | end // else: !if(~rx_data_valid_gmux) |
| 159 | end // case: RX_BODY |
| 160 | |
| 161 | default: |
| 162 | begin |
| 163 | nx_xrlm_state= IDLE; |
| 164 | valid_data = 1'b0; |
| 165 | set_err_time = 1'b0; |
| 166 | eop = 1'b0; |
| 167 | // synopsys translate_off |
| 168 | $display("( Warning: xrlm_state in unknown state.)"); |
| 169 | // synopsys translate_on |
| 170 | end // case: default |
| 171 | endcase // casex(xrlm_state) |
| 172 | end // always @ (xrlm_state or... |
| 173 | |
| 174 | |
| 175 | |
| 176 | // seq part |
| 177 | RegRst #(1) xrlm_state_RegRst(.din(nx_xrlm_state), |
| 178 | .clk(rx_clk), |
| 179 | .reset(rx_reset), |
| 180 | .qout(xrlm_state)); |
| 181 | |
| 182 | endmodule // xrlm_sm |
| 183 | |
| 184 | |