viterbi_encode9.v

一种维特比译码器状态度量初始化的方法和装置.无压缩密码。

/******************************************************/
	module viterbi_encode9(X,Y,Clock,Reset); 
/******************************************************/

input X, Clock, Reset;

output [1:0] Y; 

wire [1:0] Yt;
wire X, Clock, Reset;

wire [8:0] PolyA, PolyB;
wire [8:0] wA, wB, ShReg;

//   assign   PolyA = 9'b111_101_011;
//   assign   PolyB = 9'b101_110_001;

   assign   PolyA = 9'b110_101_111;
   assign   PolyB = 9'b100_011_101;

   assign wA = PolyA & ShReg;
   assign wB = PolyB & ShReg;

   assign ShReg[8] = X;
   pDFF dff7(ShReg[8], ShReg[7], Clock, Reset);
   pDFF dff6(ShReg[7], ShReg[6], Clock, Reset);   
   pDFF dff5(ShReg[6], ShReg[5], Clock, Reset);
   pDFF dff4(ShReg[5], ShReg[4], Clock, Reset);
   pDFF dff3(ShReg[4], ShReg[3], Clock, Reset);
   pDFF dff2(ShReg[3], ShReg[2], Clock, Reset);
   pDFF dff1(ShReg[2], ShReg[1], Clock, Reset);
   pDFF dff0(ShReg[1], ShReg[0], Clock, Reset);

   assign Yt[1] = wA[0] ^ wA[1] ^ wA[2] ^ wA[3] ^ wA[4] ^ wA[5] ^ wA[6] ^ wA[7] ^ wA[8];
   assign Yt[0] = wB[0] ^ wB[1] ^ wB[2] ^ wB[3] ^ wB[4] ^ wB[5] ^ wB[6] ^ wB[7] ^ wB[8];

   pDFF dffy1(Yt[1], Y[1], Clock, Reset);
   pDFF dffy0(Yt[0], Y[0], Clock, Reset);
endmodule