| 1 | // ========== Copyright Header Begin ========================================== |
| 2 | // |
| 3 | // OpenSPARC T2 Processor File: niu_smx_ecc16_genpar.v |
| 4 | // Copyright (C) 1995-2007 Sun Microsystems, Inc. All Rights Reserved |
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| 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 |
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| 22 | // For the avoidance of doubt, and except that if any non-GPL license |
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| 34 | // ========== Copyright Header End ============================================ |
| 35 | |
| 36 | |
| 37 | // implemented per N2 ras |
| 38 | // 16b data, 6b checkbits |
| 39 | // cor_parity_5 use in correction logic; |
| 40 | // special bit5 generation in correction mode |
| 41 | module niu_smx_ecc16_genpar (data, chkbit, parity, cor_parity_5); |
| 42 | |
| 43 | input [15:0] data; |
| 44 | input [4:0] chkbit; // use for correct logic; bit5 is different |
| 45 | output [5:0] parity; |
| 46 | output cor_parity_5; |
| 47 | |
| 48 | assign parity[0] = data[0] ^ data[1] ^ data[3] ^ data[4] ^ data[6] ^ |
| 49 | data[8] ^ data[10] ^ data[11] ^ data[13] ^ data[15]; |
| 50 | |
| 51 | assign parity[1] = data[0] ^ data[2] ^ data[3] ^ data[5] ^ data[6] ^ |
| 52 | data[9] ^ data[10] ^ data[12] ^ data[13]; |
| 53 | |
| 54 | assign parity[2] = data[1] ^ data[2] ^ data[3] ^ data[7] ^ data[8] ^ |
| 55 | data[9] ^ data[10] ^ data[14] ^ data[15]; |
| 56 | |
| 57 | assign parity[3] = data[4] ^ data[5] ^ data[6] ^ data[7] ^ data[8] ^ |
| 58 | data[9] ^ data[10]; |
| 59 | |
| 60 | assign parity[4] = data[11] ^ data[12] ^ data[13] ^ data[14] ^ data[15]; |
| 61 | |
| 62 | assign parity[5]= data[0] ^ data[1] ^ data[2] ^ data[3] ^ |
| 63 | parity[0] ^ parity[1] ^ parity[2]; |
| 64 | |
| 65 | assign cor_parity_5 = data[15] ^ data[14] ^ data[13] ^ data[12] ^ |
| 66 | data[11] ^ data[10] ^ data[9] ^ data[8] ^ |
| 67 | data[7] ^ data[6] ^ data[5] ^ data[4] ^ |
| 68 | data[3] ^ data[2] ^ data[1] ^ data[0] ^ |
| 69 | chkbit[4] ^ chkbit[3] ^ chkbit[2] ^ chkbit[1] ^ chkbit[0]; |
| 70 | |
| 71 | endmodule |