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level_decoding.v ( File view )

From:H264 Verilog
  • By culourwq 2016-05-23
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			//--------------------------------------------------------------------------------------------------
// Design    : nova
// Author(s) : Ke Xu
// Email	   : eexuke@yahoo.com
// File      : level_decoding.v
// Generated : June 9, 2005
// Copyright (C) 2008 Ke Xu                
//-------------------------------------------------------------------------------------------------
// Description 
// Devive the level_prefix,level_suffix,suffixLength,levelSuffixSize,levelCode
// In systemC,levelSuffixSize is decoded @LevelPrefix,in RTL,now changed to @LevelSuffix
// level_suffix[7:0],levelCode[7:0],level[8:0]
// 1. level_abs_tmp[8:0]:|levelCode+2| or |-levelCode-1|                                   | reg
// 2. level_abs    [7:0]:level_abs_tmp >> 1 and latched, used for suffixLength calculation | wire
// 3. level_tmp    [8:0]:2's complement, equals (levelCode+2)>>1 or (-levelCode-1)>>1      | wire
// 4. level_0 ~ level_15:According to i_level,level_tmp is assigned to level_[i_level]     | reg
//    level_0 ~ level_15 are 2's complement
//-------------------------------------------------------------------------------------------------

// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "nova_defines.v"

module level_decoding (clk,reset_n,cavlc_decoder_state,heading_one_pos,suffix_length_initialized,i_level,
	TotalCoeff,TrailingOnes,BitStream_buffer_output,
	levelSuffixSize,
	level_0,level_1,level_2, level_3, level_4, level_5, level_6, level_7,
	level_8,level_9,level_10,level_11,level_12,level_13,level_14,level_15);
	input clk,reset_n;
	input [3:0] cavlc_decoder_state; 
	input [3:0] heading_one_pos;
	input suffix_length_initialized;
	input [3:0] i_level;
	input [4:0] TotalCoeff;
	input [1:0] TrailingOnes;
	input [15:0] BitStream_buffer_output;
	output [3:0] levelSuffixSize;
	output [8:0] level_0,level_1,level_2,level_3,level_4,level_5,level_6,level_7;
	output [8:0] level_8,level_9,level_10,level_11,level_12,level_13,level_14,level_15;
	
	reg [3:0] levelSuffixSize;
	reg [8:0] level_0,level_1,level_2,level_3,level_4,level_5,level_6,level_7;
	reg [8:0] level_8,level_9,level_10,level_11,level_12,level_13,level_14,level_15;
	
	reg [3:0] level_prefix;
	reg [3:0] suffixLength;
	reg [11:0] level_suffix;
	reg [8:0] levelCode;
	reg [8:0] level_tmp;
	reg [7:0] level_abs;
	
	wire [8:0] levelCode_tmp;
	
	//@LevelPrefix,latch the result
	always @ (posedge clk)
		if (reset_n == 0)
			level_prefix <= 0;
		else if (cavlc_decoder_state == `LevelPrefix)
			level_prefix <= heading_one_pos;
	//@LevelPrefix,latch the result		
	always @ (posedge clk)
		if (reset_n == 0)
			suffixLength <= 0;
		else if (cavlc_decoder_state == `LevelPrefix)
			begin
				if (suffix_length_initialized == 1'b0)
					suffixLength <= (TotalCoeff > 10 && TrailingOnes < 3)? 4'd1:4'd0;
				//Revise log:March 26,2006
				//else if (suffixLength == 0 && ((level_abs > (8'd3 << (suffixLength - 1))) && suffixLength < 6))
				else if (suffixLength == 0 && level_abs > 8'd3)
					suffixLength <= 4'd2;
				else if (suffixLength == 0)
					suffixLength <= 4'd1;
				else if ((level_abs > (8'd3 << (suffixLength - 1))) && suffixLength < 6)
					suffixLength <= suffixLength + 1;
			end
	//@LevelSuffix,temporary result
	always @ (cavlc_decoder_state or level_prefix or suffixLength)
		if (cavlc_decoder_state == `LevelSuffix)
			begin
				if (level_prefix == 14 && suffixLength == 0)
					levelSuffixSize <= 4;
				else if (level_prefix == 4'd15)
					levelSuffixSize <= 4'd12;
				else 
					levelSuffixSize <= suffixLength;
			end
		else
			levelSuffixSize <= 0;
	//@LevelSuffix,temporay result
	always	@ (cavlc_decoder_state or levelSuffixSize or BitStream_buffer_output)
		if (cavlc_decoder_state == `LevelSuffix)
			begin
				if (levelSuffixSize == 0)
					level_suffix <= 0;
				else
					case (levelSuffixSize)
						1 :level_suffix <= {
11'b0,BitStream_buffer_output[15]
};
						2 :level_suffix <= {
10'b0,BitStream_buffer_output[15:14]
};
						3 :level_suffix <= {
9'b0,BitStream_buffer_output[15:13]
};
						4 :level_suffix <= {
8'b0,BitStream_buffer_output[15:12]
};
						5 :level_suffix <= {
7'b0,BitStream_buffer_output[15:11]
};
						6 :level_suffix <= {
6'b0,BitStream_buffer_output[15:10]
};
						7 :level_suffix <= {
5'b0,BitStream_buffer_output[15:9]
};
						8 :level_suffix <= {
4'b0,BitStream_buffer_output[15:8]
};
						9 :level_suffix <= {
3'b0,BitStream_buffer_output[15:7]
};
						10:level_suffix <= {
2'b0,BitStream_buffer_output[15:6]
};
						11:level_suffix <= {
1'b0,BitStream_buffer_output[15:5]
};
						12:level_suffix <= BitStream_buffer_output[15:4];
						default:level_suffix <= 0;
					endcase
			end
		else
			level_suffix <= 0;
	
	assign levelCode_tmp = (cavlc_decoder_state == `LevelSuffix)? ((level_prefix << suffixLength) + level_suffix):0;
	
	always @ (cavlc_decoder_state or level_prefix or suffixLength or i_level or TrailingOnes or levelCode_tmp)
		if (cavlc_decoder_state == `LevelSuffix)
			begin
				if (level_prefix == 15 && suffixLength == 0 && i_level == {
2'b0,TrailingOnes
} && TrailingOnes < 3)
					levelCode <= levelCode_tmp + 17;
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H.264.mpf55.79 kB28-02-09|00:05
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Intra_pred_PE.sdf2.05 MB22-02-09|14:06
Intra_pred_PE.srd1.03 MB22-02-09|14:06
Intra_pred_PE.srm1.61 MB22-02-09|14:06
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_primary.dat73.20 kB24-02-09|15:26
_primary.vhd11.00 kB24-02-09|15:26
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_primary.dat17.38 kB26-02-09|11:49
_primary.vhd4.65 kB26-02-09|11:49
verilog.asm61.01 kB22-02-09|21:56
_primary.dat8.81 kB19-02-09|20:59
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verilog.asm15.53 kB24-02-09|15:27
_primary.dat1.24 kB24-02-09|15:27
_primary.vhd902.00 B24-02-09|15:27
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_primary.dat687.00 B26-02-09|11:49
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