projects / OpenSPARC-T2-DV / blame
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1 | // ========== Copyright Header Begin ========================================== |
| 2 | // | |
| 3 | // OpenSPARC T2 Processor File: mgrlm_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 : mgrlm_sm | |
| 40 | * Author Name : John Lo | |
| 41 | * Description : | |
| 42 | * Parent Module: rx_mii_gmii | |
| 43 | * Child Module: | |
| 44 | * Interface Mod: | |
| 45 | * Date Created : 10/4/00 | |
| 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 mgrlm_sm ( | |
| 57 | rx_nbclk, | |
| 58 | rx_reset_nbclk, | |
| 59 | rx_enable_nbclk, | |
| 60 | rx_det_sfd, // ipg_done and rx_det_S are level signals. | |
| 61 | rx_det_eop_lv, // rx_det_sfd is level signals. | |
| 62 | rx_heart_beat, | |
| 63 | rxfifo_full_nbclk, | |
| 64 | // outputs | |
| 65 | load_ok_state, | |
| 66 | adjust_rx_heart_beat, // should be a pulse | |
| 67 | mgrlm_state | |
| 68 | ); | |
| 69 | input rx_nbclk; | |
| 70 | input rx_reset_nbclk; | |
| 71 | input rx_enable_nbclk; | |
| 72 | input rx_det_sfd; | |
| 73 | input rx_det_eop_lv; | |
| 74 | input rx_heart_beat; | |
| 75 | input rxfifo_full_nbclk; | |
| 76 | output load_ok_state; | |
| 77 | output adjust_rx_heart_beat; // should be a pulse | |
| 78 | output mgrlm_state; | |
| 79 | ||
| 80 | reg adjust_rx_heart_beat; | |
| 81 | reg nx_mgrlm_state; | |
| 82 | wire mgrlm_state; | |
| 83 | wire load_ok_state; | |
| 84 | ||
| 85 | parameter IDLE = 1'b0, | |
| 86 | PAYLOAD = 1'b1; | |
| 87 | ||
| 88 | assign load_ok_state = (mgrlm_state == PAYLOAD); | |
| 89 | ||
| 90 | // comb part | |
| 91 | always @ (mgrlm_state or rx_det_sfd or rx_enable_nbclk or | |
| 92 | rxfifo_full_nbclk or rx_det_eop_lv or rx_heart_beat) | |
| 93 | begin | |
| 94 | nx_mgrlm_state = IDLE; | |
| 95 | adjust_rx_heart_beat = 0; // should be a pulse | |
| 96 | ||
| 97 | casex(mgrlm_state) | |
| 98 | IDLE: if (rx_det_sfd & rx_enable_nbclk & (~rxfifo_full_nbclk)) | |
| 99 | begin | |
| 100 | nx_mgrlm_state = PAYLOAD; | |
| 101 | adjust_rx_heart_beat = 1; | |
| 102 | end | |
| 103 | else nx_mgrlm_state = mgrlm_state; // stay | |
| 104 | ||
| 105 | PAYLOAD: if ((rx_det_eop_lv & rx_heart_beat) | rxfifo_full_nbclk) | |
| 106 | nx_mgrlm_state = IDLE; | |
| 107 | else nx_mgrlm_state = mgrlm_state; // stay | |
| 108 | endcase // casex(mgrlm_state) | |
| 109 | end | |
| 110 | ||
| 111 | // seq part | |
| 112 | RegRst #(1) mgrlm_state_RegRst(.clk(rx_nbclk), | |
| 113 | .reset(rx_reset_nbclk), | |
| 114 | .din(nx_mgrlm_state), | |
| 115 | .qout(mgrlm_state)); | |
| 116 | ||
| 117 | endmodule // mgrlm_sm |