lactable.v

完整的jpeg encoder verilog code,DCT部分採用1991 IEEE transection paper,利用skew circular convolution來實現精簡電路

//==============================================
//     luminance AC coefficients 
//==============================================
`timescale 1ns/10ps

module lactable(//input
                  run,size,
                  
                //output
                  code, length);
input [3:0] run;
input [3:0] size;

output [15:0] code;
output [3:0] length;

wire [7:0] ptr={run,4'b0}+size;
reg [15:0] code;
reg [3:0] length; 

always @(ptr)
begin
 case(ptr)
    //---------- code =0 ---------------
    0: begin //EOB
           code=16'b1010_0000_0000_0000;
           length=4'b0100;
       end
    1: begin 
           code=16'b0000_0000_0000_0000;
           length=4'b0010;
       end
    2: begin
           code=16'b0100_0000_0000_0000;
           length=4'b0010;
       end
    3: begin
           code=16'b1000_0000_0000_0000;
           length=4'b0011;
       end
    4: begin
           code=16'b1011_0000_0000_0000;
           length=4'b0100;
       end
    5: begin
           code=16'b1101_0000_0000_0000;
           length=4'b0101;
       end
    6: begin
           code=16'b1111_0000_0000_0000;
           length=4'b0111;
       end
    7: begin
           code=16'b1111_1000_0000_0000;
           length=4'b1000;
       end
    8: begin
           code=16'b1111_1101_0000_0000;
           length=4'b1010;
       end
    9: begin
           code=16'b1111_1111_1000_0010;
           length=4'b0000;
       end
   10: begin
           code=16'b1111_1111_1000_0011;
           length=4'b0000;
       end    
     //---------- code =1 -----------------      
   17: begin
           code=16'b1100_0000_0000_0000;
           length=4'b0100;
       end
   18: begin
           code=16'b1101_1000_0000_0000;
           length=4'b0101;
       end
   19: begin
           code=16'b1111_0010_0000_0000;
           length=4'b0111;
       end
   20: begin
           code=16'b1111_1011_0000_0000;
           length=4'b1001;
       end
   21: begin
           code=16'b1111_1110_1100_0000;
           length=4'b1011;
       end
   22: begin
           code=16'b1111_1111_1000_0100;
           length=4'b0000;
       end
   23: begin
           code=16'b0000_0000_1000_0101;
           length=4'b0000;
       end
   24: begin
           code=16'b1111_1111_1000_0110;
           length=4'b0000;
       end
   25: begin
           code=16'b1111_1111_1000_0111;
           length=4'b0000;
       end
   26: begin
           code=16'b1111_1111_1000_1000;
           length=4'b0000;
       end
   //----------- code =2 -----------------
   33: begin
           code=16'b1110_0000_0000_0000;
           length=4'b0101;
       end
   34: begin
           code=16'b1111_1001_0000_0000;
           length=4'b1000;
       end
   35: begin
           code=16'b1111_1101_1100_0000;
           length=4'b1010;
       end
   36: begin
           code=16'b1111_1111_0100_0000;
           length=4'b1100;
       end
   37: begin
           code=16'b1111_1111_1000_1001;
           length=4'b0000;
       end
   38: begin
           code=16'b1111_1111_1000_1010;
           length=4'b0000;
       end
   39: begin
           code=16'b1111_1111_1000_1011;
           length=4'b0000;
       end
   40: begin
           code=16'b1111_1111_1000_1100;
           length=4'b0000;
       end
   41: begin
           code=16'b1111_1111_1000_1101;
           length=4'b0000;
       end
   42: begin
           code=16'b1111_1111_1000_1110;
           length=4'b0000;
       end     
     //--------- code=16'b 3 -------------
   49: begin
           code=16'b1110_1000_0000_0000;
           length=4'b0110;
       end
   50: begin
           code=16'b1111_1011_1000_0000;
           length=4'b1001;
       end
   51: begin
           code=16'b1111_1111_0101_0000;
           length=4'b1100;
       end
   52: begin
           code=16'b1111_1111_1000_1111;
           length=4'b0000;
       end
   53: begin
           code=16'b1111_1111_1001_0000;
           length=4'b0000;
       end
   54: begin
           code=16'b1111_1111_1001_0001;
           length=4'b0000;
       end
   55: begin
           code=16'b1111_1111_1001_0010;
           length=4'b0000;
       end
   56: begin
           code=16'b1111_1111_1001_0011;
           length=4'b0000;
       end
   57: begin
           code=16'b1111_1111_1001_0100;
           length=4'b0000;
       end
   58: begin
           code=16'b1111_1111_1001_0101;
           length=4'b0000;
       end      
   //--------- code=16'b 4 -------------
   65: begin
           code=16'b1110_1100_0000_0000;
           length=4'b0110;
       end
   66: begin
           code=16'b1111_1110_0000_0000;
           length=4'b1010;
       end
   67: begin
           code=16'b1111_1111_1001_0110;
           length=4'b0000;
       end
   68: begin
           code=16'b1111_1111_1001_0111;
           length=4'b0000;
       end
   69: begin
           code=16'b1111_1111_1001_1000;
           length=4'b0000;
       end
   70: begin
           code=16'b1111_1111_1001_1001;
           length=4'b0000;
       end
   71: begin
           code=16'b1111_1111_1001_1010;
           length=4'b0000;
       end
   72: begin
           code=16'b1111_1111_1001_1011;
           length=4'b0000;
       end
   73: begin
           code=16'b1111_1111_1001_1100;
           length=4'b0000;
       end
   74: begin
           code=16'b1111_1111_1001_1101;
           length=4'b0000;
       end
    //--------- code=16'b 5 -------------
     
   81: begin
           code=16'b1111_0100_0000_0000;
           length=4'b0111;
       end
   82: begin
           code=16'b1111_1110_1110_0000;
           length=4'b1011;
       end
   83: begin
           code=16'b1111_1111_1001_1110;
           length=4'b0000;
       end
   84: begin
           code=16'b1111_1111_1001_1111;
           length=4'b0000;
       end
   85: begin
           code=16'b1111_1111_1010_0000;
           length=4'b0000;
       end
   86: begin
           code=16'b1111_1111_1010_0001;
           length=4'b0000;
       end
   87: begin
           code=16'b1111_1111_1010_0010;
           length=4'b0000;
       end
   88: begin
           code=16'b1111_1111_1010_0011;
           length=4'b0000;
       end
   89: begin
           code=16'b1111_1111_1010_0100;
           length=4'b0000;
       end
   90: begin
           code=16'b1111_1111_1010_0101;
           length=4'b0000;
       end     
      //--------- code=16'b 6 -------------
   97: begin
           code=16'b1111_0110_0000_0000;
           length=4'b0111;
       end
   98: begin
           code=16'b1111_1111_0110_0000;
           length=4'b1010;
       end
   99: begin
           code=16'b1111_1111_1010_0110;
           length=4'b0000;
       end
  100: begin
           code=16'b1111_1111_1010_0110;
           length=4'b0000;
       end
  101: begin
           code=16'b1111_1111_1010_0111;
           length=4'b0000;
       end
  102: begin
           code=16'b1111_1111_1010_1000;
           length=4'b0000;
       end
  103: begin
           code=16'b1111_1111_1010_1001;
           length=4'b0000;
       end
  104: begin
           code=16'b1111_1111_1010_1010;
           length=4'b0000;
       end
  105: begin
           code=16'b1111_1111_1010_1011;
           length=4'b0000;
       end
  106: begin
           code=16'b1111_1111_1010_1100;
           length=4'b0000;
       end              
 
    //--------- code=16'b 7 -------------
  113: begin
           code=16'b1111_1010_0000_0000;
           length=4'b1000;
       end
  114: begin
           code=16'b1111_1111_0111_0000;
           length=4'b1100;
       end
  115: begin
           code=16'b1111_1111_1010_1110;
           length=4'b0000;
       end
  116: begin
           code=16'b1111_1111_1010_1111;
           length=4'b0000;
       end
  117: begin
           code=16'b1111_1111_1011_0000;
           length=4'b0000;
       end
  118: begin
           code=16'b1111_1111_1011_0001;
           length=4'b0000;
       end
  119: begin
           code=16'b1111_1111_1011_0010;
           length=4'b0000;
       end
  120: begin
           code=16'b1111_1111_1011_0011;
           length=4'b0000;
       end
  121: begin
           code=16'b1111_1111_1011_0100;