cos_constants_package.v

来自「JPEG_D IP Core Verilog crypted source」· Verilog 代码 · 共 74 行

//---------------------------------------------------------------------------
// Project  : JPEG-D - Baseline JPEG Decoder
//
// File     : cos_constants_package.v
//
// Purpose  : Package with all constants and functions used by the IP core for cosine coefficients
//
// Created by ALMA Technologies S.A.
// Copyright (c) 2001-2007 Alma Technologies S.A.
//
//---------------------------------------------------------------------------
// Design Engineer        : S. Theoharis, G. Anagnostopoulos
// Quality Engineer       : N. Zervas
// Creation Date          : 16 December 2002
// Last Modification Date : 21 November 2003
// File history           :
//      16 December 2002 (1.00)
//      21 November 2003 (2.00) : Update file header to adhere company's template
//---------------------------------------------------------------------------
// Please review the terms of the license agreement before using this file.
// If you are not an authorized user, please destroy this source code file
// and notify Alma Technologies or CAST, Inc. immediately that you
// inadvertently received an unauthorized copy.
//---------------------------------------------------------------------------

//---------------------------------------------------------------
//                Constants and type declarations              --
//---------------------------------------------------------------
`define N_COEF_BITS 10 // Number of bits for cos coefficients
`define N_COEF_BITS_10

// Coefficients for 8x8 block DCT. User can produce them using gen_cos.exe program.

// 10 bit
`ifdef N_COEF_BITS_10
   `define COS_MATRIX7 'b0000110001
   `define COS_MATRIX6 'b0001100001
   `define COS_MATRIX5 'b0010001110
   `define COS_MATRIX4 'b0010110101
   `define COS_MATRIX3 'b0011010100
   `define COS_MATRIX2 'b0011101100
   `define COS_MATRIX1 'b0011111011
   `define COS_MATRIX0 'b0010110101
`endif

// 12 bit
`ifdef N_COEF_BITS_12
   `define COS_MATRIX7 'b000011000111
   `define COS_MATRIX6 'b000110000111
   `define COS_MATRIX5 'b001000111000
   `define COS_MATRIX4 'b001011010100
   `define COS_MATRIX3 'b001101010011
   `define COS_MATRIX2 'b001110110010
   `define COS_MATRIX1 'b001111101100
   `define COS_MATRIX0 'b001011010100
`endif

// 14 bit
`ifdef N_COEF_BITS_12 4
   `define COS_MATRIX7 'b00001100011111
   `define COS_MATRIX6 'b00011000011111
   `define COS_MATRIX5 'b00100011100011
   `define COS_MATRIX4 'b00101101010000
   `define COS_MATRIX3 'b00110101001101
   `define COS_MATRIX2 'b00111011001000
   `define COS_MATRIX1 'b00111110110001
   `define COS_MATRIX0 'b00101101010000
`endif

parameter [31:0] MATRIX_8X8_BLOCK0 = 'h76543210;
parameter [31:0] MATRIX_8X8_BLOCK1 = 'hDA9CF630;
parameter [31:0] MATRIX_8X8_BLOCK2 = 'h327C9E50;
parameter [31:0] MATRIX_8X8_BLOCK3 = 'h9E34DA70;