// ========== Copyright Header Begin ========================================== // // OpenSPARC T2 Processor File: pcs_rx_disparity.v // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved // 4150 Network Circle, Santa Clara, California 95054, U.S.A. // // * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. // // This program is free software; you can redistribute it and/or modify // it under the terms of the GNU General Public License as published by // the Free Software Foundation; version 2 of the License. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // You should have received a copy of the GNU General Public License // along with this program; if not, write to the Free Software // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA // // For the avoidance of doubt, and except that if any non-GPL license // choice is available it will apply instead, Sun elects to use only // the General Public License version 2 (GPLv2) at this time for any // software where a choice of GPL license versions is made // available with the language indicating that GPLv2 or any later version // may be used, or where a choice of which version of the GPL is applied is // otherwise unspecified. // // Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, // CA 95054 USA or visit www.sun.com if you need additional information or // have any questions. // // ========== Copyright Header End ============================================ // @(#)pcs_rx_disparity.v 1.1G /**********************************************************************/ /* Project Name : CASSINI */ /* Module Name : PCS Running Disparity Calculator */ /* Description : Calculates new running disparity based on */ /* disparity for both most significant 6 bits and */ /* least significant 4 bits. The running disparity */ /* of the most significant 6 bits is called new_RD. */ /* The final running disparity for all 10 bits is */ /* called RD. */ /* */ /* Assumptions : none. */ /* */ /* Parent module : pcs_decoder.v */ /* Child modules : none. */ /* Author Name : Linda Chen */ /* Date Created : 10/21/96 */ /* */ /* Copyright (c) 1994, Sun Microsystems, Inc. */ /* Sun Proprietary and Confidential */ /* */ /* Modifications : none yet */ /* Synthesis Notes : none yet */ /**********************************************************************/ module pcs_rx_disparity (data, RDreg, // inputs newRD, RD); // outputs input [9:0] data; // 8b10b encoded data input RDreg; // current running disparity output newRD, // mid character running disparity RD; // final value for running disparity wire noneof6, oneof6, twoof6, threeof6, fourof6, fiveof6, sixof6; //no. of 1#s in data[9:4] wire noneof4, oneof4, twoof4, threeof4, fourof4; //no. of 1#s in data[3:0] assign noneof4 = ~(data[0] | data[1] | data[2] | data[3]), fourof4 = data[0] & data[1] & data[2] & data[3], threeof4 = ((data[0]^data[1]) & (~(data[2]^data[3]) & (data[2]&data[3]))) | ((data[2]^data[3]) & (~(data[0]^data[1]) & (data[0]&data[1]))), oneof4 = ((~data[0]^~data[1]) & (~(~data[2]^~data[3]) & (~data[2]&~data[3]))) | ((~data[2]^~data[3]) & (~(~data[0]^~data[1]) & (~data[0]&~data[1]))), twoof4 = ((data[0]^data[1]) & (data[2]^data[3])) | ((data[0]&data[1]) ^ (data[2]&data[3])), noneof6 = ~(data[4] | data[5] | data[6] | data[7] | data[8] | data[9]), sixof6 = data[4] & data[5] & data[6] & data[7] & data[8] & data[9], fiveof6 = ( (((data[4]^data[5]) & (~(data[6]^data[7]) & (data[6]&data[7]))) | ((data[6]^data[7]) & (~(data[4]^data[5]) & (data[4]&data[5])))) & (data[8] & data[9]) ) | ((data[4] & data[5] & data[6] & data[7]) & (data[8] ^ data[9])), oneof6 = ( (((~data[4]^~data[5]) & (~(~data[6]^~data[7]) & (~data[6]&~data[7]))) | ((~data[6]^~data[7]) & (~(~data[4]^~data[5]) & (~data[4]&~data[5])))) & (~data[8] & ~data[9]) ) | ((~data[4] & ~data[5] & ~data[6] & ~data[7]) & (~data[8] ^ ~data[9])), fourof6 = ( (((data[4]^data[5]) & (data[6]^data[7])) | ((data[4]&data[5]) ^ (data[6]&data[7]))) & (data[8] & data[9]) ) | ( (((data[4]^data[5]) & (~(data[6]^data[7]) & (data[6]&data[7]))) | ((data[6]^data[7]) & (~(data[4]^data[5]) & (data[4]&data[5])))) & (data[8] ^ data[9]) ) | ( (data[4] & data[5] & data[6] & data[7]) & (~(data[8]|data[9])) ), twoof6 = ( (((~data[4]^~data[5]) & (~data[6]^~data[7])) | ((~data[4]&~data[5]) ^ (~data[6]&~data[7]))) & (~data[8] & ~data[9]) ) | ( (((~data[4]^~data[5]) & (~(~data[6]^~data[7]) & (~data[6]&~data[7]))) | ((~data[6]^~data[7]) & (~(~data[4]^~data[5]) & (~data[4]&~data[5])))) & (~data[8] ^ ~data[9]) ) | ( (~data[4] & ~data[5] & ~data[6] & ~data[7]) & (~(~data[8]|~data[9])) ), threeof6 = ( (((~data[4]^~data[5]) & (~(~data[6]^~data[7]) & (~data[6]&~data[7]))) | ((~data[6]^~data[7]) & (~(~data[4]^~data[5]) & (~data[4]&~data[5])))) & (data[8] & data[9]) ) | ( (((data[4]^data[5]) & (data[6]^data[7])) | ((data[4]&data[5]) ^ (data[6]&data[7]))) & (data[8] ^ data[9]) ) | ( (((data[4]^data[5]) & (~(data[6]^data[7]) & (data[6]&data[7]))) | ((data[6]^data[7]) & (~(data[4]^data[5]) & (data[6]&data[7])))) & ( ~(data[8] | data[9])) ), newRD = ((noneof6 | oneof6 | twoof6) | (threeof6 & (data[9:4]==6'b111000))) ? 1'b0 : ((fourof6 | fiveof6 | sixof6) | (threeof6 & (data[9:4]==6'b000111))) ? 1'b1 : RDreg, RD = ((noneof4 | oneof4) | (twoof4 & (data[3:0]==4'b1100))) ? 1'b0 : ((threeof4 | fourof4) | (twoof4 & (data[3:0]==4'b0011))) ? 1'b1 : newRD; endmodule