//--------------------------------------------------------------------------------------------------// Design    : nova// Author(s) : Ke Xu// Email	   : eexuke@yahoo.com// File      : QP_decoding.v// Generated : June 7, 2005// Copyright (C) 2008 Ke Xu                //-------------------------------------------------------------------------------------------------// Description // QPy:the luma quantisation parameter// QPi:the intermediate quantisation parameter derived from QPy// QPc:the chroma quantisation parameter derived from QPi on Table 8-13,Page136//-------------------------------------------------------------------------------------------------// Revise log  // 1. March 21,2006// Input signals slice_qp_delta and mb_qp_delta are removed, using // exp_golomb_decoding_output_5to0 instead since these two signals are latched at clock// rising edge which is too late for computation. So use exp_golomb_decoding_output_5to0 directly//-------------------------------------------------------------------------------------------------// synopsys translate_off`include "timescale.v"// synopsys translate_on`include "nova_defines.v"module QP_decoding (clk,reset_n,slice_header_state,slice_data_state,pic_init_qp_minus26,	exp_golomb_decoding_output_5to0,chroma_qp_index_offset,QPy,QPc); 	input clk,reset_n;	input [3:0] slice_header_state;	input [3:0] slice_data_state;	input [5:0] pic_init_qp_minus26;	input [5:0] exp_golomb_decoding_output_5to0;	input [4:0] chroma_qp_index_offset;	output [5:0] QPy,QPc;	reg [5:0] QPy,QPc;		always @ (posedge clk)		if (reset_n == 0)			QPy <= 0;		else if (slice_header_state == `slice_qp_delta_s)			QPy <= 26 + pic_init_qp_minus26 + exp_golomb_decoding_output_5to0;		else if (slice_data_state == `mb_qp_delta_s)			QPy <= QPy + exp_golomb_decoding_output_5to0;				wire [5:0] QPi;	assign QPi = QPy + {1'b0,chroma_qp_index_offset};	always @ (posedge clk)		if (reset_n == 0)			QPc <= 0;		else			begin				if (QPi < 30)					QPc <= QPi;				else					case (QPi)						30      :QPc <= 29;						31      :QPc <= 30;						32      :QPc <= 31;						33,34   :QPc <= 32;						35      :QPc <= 33;						36,37   :QPc <= 34;						38,39   :QPc <= 35;						40,41   :QPc <= 36;						42,43,44:QPc <= 37;						45,46,47:QPc <= 38;						default :QPc <= 39;					endcase			endendmodule