projects / OpenSPARC-T2-DV / blame
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1 | // ========== Copyright Header Begin ========================================== |
| 2 | // | |
| 3 | // OpenSPARC T2 Processor File: pcs_rx_disparity.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 | // @(#)pcs_rx_disparity.v 1.1G | |
| 36 | /**********************************************************************/ | |
| 37 | /* Project Name : CASSINI */ | |
| 38 | /* Module Name : PCS Running Disparity Calculator */ | |
| 39 | /* Description : Calculates new running disparity based on */ | |
| 40 | /* disparity for both most significant 6 bits and */ | |
| 41 | /* least significant 4 bits. The running disparity */ | |
| 42 | /* of the most significant 6 bits is called new_RD. */ | |
| 43 | /* The final running disparity for all 10 bits is */ | |
| 44 | /* called RD. */ | |
| 45 | /* */ | |
| 46 | /* Assumptions : none. */ | |
| 47 | /* */ | |
| 48 | /* Parent module : pcs_decoder.v */ | |
| 49 | /* Child modules : none. */ | |
| 50 | /* Author Name : Linda Chen */ | |
| 51 | /* Date Created : 10/21/96 */ | |
| 52 | /* */ | |
| 53 | /* Copyright (c) 1994, Sun Microsystems, Inc. */ | |
| 54 | /* Sun Proprietary and Confidential */ | |
| 55 | /* */ | |
| 56 | /* Modifications : none yet */ | |
| 57 | /* Synthesis Notes : none yet */ | |
| 58 | /**********************************************************************/ | |
| 59 | ||
| 60 | module pcs_rx_disparity (data, RDreg, // inputs | |
| 61 | newRD, RD); // outputs | |
| 62 | ||
| 63 | input [9:0] data; // 8b10b encoded data | |
| 64 | input RDreg; // current running disparity | |
| 65 | ||
| 66 | output newRD, // mid character running disparity | |
| 67 | RD; // final value for running disparity | |
| 68 | ||
| 69 | wire noneof6, oneof6, twoof6, threeof6, fourof6, fiveof6, sixof6; | |
| 70 | //no. of 1#s in data[9:4] | |
| 71 | wire noneof4, oneof4, twoof4, threeof4, fourof4; | |
| 72 | //no. of 1#s in data[3:0] | |
| 73 | ||
| 74 | assign noneof4 = ~(data[0] | data[1] | data[2] | data[3]), | |
| 75 | fourof4 = data[0] & data[1] & data[2] & data[3], | |
| 76 | threeof4 = ((data[0]^data[1]) & (~(data[2]^data[3]) & | |
| 77 | (data[2]&data[3]))) | ((data[2]^data[3]) & | |
| 78 | (~(data[0]^data[1]) & (data[0]&data[1]))), | |
| 79 | oneof4 = ((~data[0]^~data[1]) & (~(~data[2]^~data[3]) & | |
| 80 | (~data[2]&~data[3]))) | ((~data[2]^~data[3]) & | |
| 81 | (~(~data[0]^~data[1]) & (~data[0]&~data[1]))), | |
| 82 | twoof4 = ((data[0]^data[1]) & (data[2]^data[3])) | | |
| 83 | ((data[0]&data[1]) ^ (data[2]&data[3])), | |
| 84 | noneof6 = ~(data[4] | data[5] | data[6] | data[7] | | |
| 85 | data[8] | data[9]), | |
| 86 | sixof6 = data[4] & data[5] & data[6] & data[7] & data[8] & | |
| 87 | data[9], | |
| 88 | fiveof6 = ( (((data[4]^data[5]) & (~(data[6]^data[7]) & | |
| 89 | (data[6]&data[7]))) | ((data[6]^data[7]) & | |
| 90 | (~(data[4]^data[5]) & (data[4]&data[5])))) & | |
| 91 | (data[8] & data[9]) ) | ((data[4] & data[5] & | |
| 92 | data[6] & data[7]) & (data[8] ^ data[9])), | |
| 93 | oneof6 = ( (((~data[4]^~data[5]) & (~(~data[6]^~data[7]) & | |
| 94 | (~data[6]&~data[7]))) | ((~data[6]^~data[7]) & | |
| 95 | (~(~data[4]^~data[5]) & (~data[4]&~data[5])))) | |
| 96 | & (~data[8] & ~data[9]) ) | ((~data[4] & ~data[5] & | |
| 97 | ~data[6] & ~data[7]) & (~data[8] ^ ~data[9])), | |
| 98 | fourof6 = ( (((data[4]^data[5]) & (data[6]^data[7])) | | |
| 99 | ((data[4]&data[5]) ^ (data[6]&data[7]))) & | |
| 100 | (data[8] & data[9]) ) | ( (((data[4]^data[5]) & | |
| 101 | (~(data[6]^data[7]) & (data[6]&data[7]))) | | |
| 102 | ((data[6]^data[7]) & (~(data[4]^data[5]) & | |
| 103 | (data[4]&data[5])))) & (data[8] ^ data[9]) ) | | |
| 104 | ( (data[4] & data[5] & data[6] & data[7]) & | |
| 105 | (~(data[8]|data[9])) ), | |
| 106 | twoof6 = ( (((~data[4]^~data[5]) & (~data[6]^~data[7])) | | |
| 107 | ((~data[4]&~data[5]) ^ (~data[6]&~data[7]))) & | |
| 108 | (~data[8] & ~data[9]) ) | ( (((~data[4]^~data[5]) & | |
| 109 | (~(~data[6]^~data[7]) & (~data[6]&~data[7]))) | |
| 110 | | ((~data[6]^~data[7]) & (~(~data[4]^~data[5]) & | |
| 111 | (~data[4]&~data[5])))) & (~data[8] ^ ~data[9]) ) | | |
| 112 | ( (~data[4] & ~data[5] & ~data[6] & ~data[7]) & | |
| 113 | (~(~data[8]|~data[9])) ), | |
| 114 | threeof6 = ( (((~data[4]^~data[5]) & (~(~data[6]^~data[7]) & | |
| 115 | (~data[6]&~data[7]))) | ((~data[6]^~data[7]) & | |
| 116 | (~(~data[4]^~data[5]) & (~data[4]&~data[5])))) & | |
| 117 | (data[8] & data[9]) ) | ( (((data[4]^data[5]) & | |
| 118 | (data[6]^data[7])) | | |
| 119 | ((data[4]&data[5]) ^ (data[6]&data[7]))) & | |
| 120 | (data[8] ^ data[9]) ) | ( (((data[4]^data[5]) & | |
| 121 | (~(data[6]^data[7]) & (data[6]&data[7]))) | |
| 122 | | ((data[6]^data[7]) & (~(data[4]^data[5]) & | |
| 123 | (data[6]&data[7])))) & ( ~(data[8] | data[9])) ), | |
| 124 | newRD = ((noneof6 | oneof6 | twoof6) | | |
| 125 | (threeof6 & (data[9:4]==6'b111000))) ? 1'b0 : | |
| 126 | ((fourof6 | fiveof6 | sixof6) | (threeof6 & | |
| 127 | (data[9:4]==6'b000111))) ? 1'b1 : RDreg, | |
| 128 | RD = ((noneof4 | oneof4) | (twoof4 & | |
| 129 | (data[3:0]==4'b1100))) ? 1'b0 : ((threeof4 | fourof4) | |
| 130 | | (twoof4 & (data[3:0]==4'b0011))) ? 1'b1 : newRD; | |
| 131 | ||
| 132 | endmodule |