| 1 |
4 |
issei |
//===================================================================
|
| 2 |
|
|
// Module Name : RsDecodeMult
|
| 3 |
|
|
// File Name : RsDecodeMult.v
|
| 4 |
|
|
// Function : Rs Decoder Multiplier Module
|
| 5 |
|
|
//
|
| 6 |
|
|
// Revision History:
|
| 7 |
|
|
// Date By Version Change Description
|
| 8 |
|
|
//===================================================================
|
| 9 |
|
|
// 2009/02/03 Gael Sapience 1.0 Original
|
| 10 |
|
|
//
|
| 11 |
|
|
//===================================================================
|
| 12 |
|
|
// (C) COPYRIGHT 2009 SYSTEM LSI CO., Ltd.
|
| 13 |
|
|
//
|
| 14 |
|
|
|
| 15 |
|
|
|
| 16 |
|
|
module RsDecodeMult(
|
| 17 |
|
|
A, // input A
|
| 18 |
|
|
B, // input B
|
| 19 |
|
|
P // output P = A*B in Galois Field
|
| 20 |
|
|
);
|
| 21 |
|
|
|
| 22 |
|
|
|
| 23 |
|
|
input [7:0] A; // input A
|
| 24 |
|
|
input [7:0] B; // input B
|
| 25 |
|
|
output [7:0] P; // output P = A*B in Galois Field
|
| 26 |
|
|
|
| 27 |
|
|
|
| 28 |
|
|
|
| 29 |
|
|
//------------------------------------------------------------------------
|
| 30 |
|
|
// + M
|
| 31 |
|
|
//-
|
| 32 |
|
|
//------------------------------------------------------------------------
|
| 33 |
|
|
wire [14:0] M;
|
| 34 |
|
|
|
| 35 |
|
|
|
| 36 |
|
|
|
| 37 |
|
|
assign M[0] = (A[0] & B[0]);
|
| 38 |
|
|
assign M[1] = (A[0] & B[1]) ^ (A[1] & B[0]);
|
| 39 |
|
|
assign M[2] = (A[0] & B[2]) ^ (A[1] & B[1]) ^ (A[2] & B[0]);
|
| 40 |
|
|
assign M[3] = (A[0] & B[3]) ^ (A[1] & B[2]) ^ (A[2] & B[1]) ^ (A[3] & B[0]);
|
| 41 |
|
|
assign M[4] = (A[0] & B[4]) ^ (A[1] & B[3]) ^ (A[2] & B[2]) ^ (A[3] & B[1]) ^ (A[4] & B[0]);
|
| 42 |
|
|
assign M[5] = (A[0] & B[5]) ^ (A[1] & B[4]) ^ (A[2] & B[3]) ^ (A[3] & B[2]) ^ (A[4] & B[1]) ^ (A[5] & B[0]);
|
| 43 |
|
|
assign M[6] = (A[0] & B[6]) ^ (A[1] & B[5]) ^ (A[2] & B[4]) ^ (A[3] & B[3]) ^ (A[4] & B[2]) ^ (A[5] & B[1]) ^ (A[6] & B[0]);
|
| 44 |
|
|
assign M[7] = (A[0] & B[7]) ^ (A[1] & B[6]) ^ (A[2] & B[5]) ^ (A[3] & B[4]) ^ (A[4] & B[3]) ^ (A[5] & B[2]) ^ (A[6] & B[1]) ^ (A[7] & B[0]);
|
| 45 |
|
|
assign M[8] = (A[1] & B[7]) ^ (A[2] & B[6]) ^ (A[3] & B[5]) ^ (A[4] & B[4]) ^ (A[5] & B[3]) ^ (A[6] & B[2]) ^ (A[7] & B[1]);
|
| 46 |
|
|
assign M[9] = (A[2] & B[7]) ^ (A[3] & B[6]) ^ (A[4] & B[5]) ^ (A[5] & B[4]) ^ (A[6] & B[3]) ^ (A[7] & B[2]);
|
| 47 |
|
|
assign M[10] = (A[3] & B[7]) ^ (A[4] & B[6]) ^ (A[5] & B[5]) ^ (A[6] & B[4]) ^ (A[7] & B[3]);
|
| 48 |
|
|
assign M[11] = (A[4] & B[7]) ^ (A[5] & B[6]) ^ (A[6] & B[5]) ^ (A[7] & B[4]);
|
| 49 |
|
|
assign M[12] = (A[5] & B[7]) ^ (A[6] & B[6]) ^ (A[7] & B[5]);
|
| 50 |
|
|
assign M[13] = (A[6] & B[7]) ^ (A[7] & B[6]);
|
| 51 |
|
|
assign M[14] = (A[7] & B[7]);
|
| 52 |
|
|
//------------------------------------------------------------------------
|
| 53 |
|
|
// + P
|
| 54 |
|
|
//-
|
| 55 |
|
|
//------------------------------------------------------------------------
|
| 56 |
|
|
assign P[0] = M[0] ^ M[8] ^ M[12] ^ M[13] ^ M[14];
|
| 57 |
|
|
assign P[1] = M[1] ^ M[9] ^ M[13] ^ M[14];
|
| 58 |
|
|
assign P[2] = M[2] ^ M[8] ^ M[10] ^ M[12] ^ M[13];
|
| 59 |
|
|
assign P[3] = M[3] ^ M[8] ^ M[9] ^ M[11] ^ M[12];
|
| 60 |
|
|
assign P[4] = M[4] ^ M[8] ^ M[9] ^ M[10] ^ M[14];
|
| 61 |
|
|
assign P[5] = M[5] ^ M[9] ^ M[10] ^ M[11];
|
| 62 |
|
|
assign P[6] = M[6] ^ M[10] ^ M[11] ^ M[12];
|
| 63 |
|
|
assign P[7] = M[7] ^ M[11] ^ M[12] ^ M[13];
|
| 64 |
|
|
|
| 65 |
|
|
|
| 66 |
|
|
endmodule
|
