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eexuke |
//--------------------------------------------------------------------------------------------------
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// Design : nova
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// Author(s) : Ke Xu
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// Email : eexuke@yahoo.com
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// File : total_zeros_decoding.v
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// Generated : June 9, 2005
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// Copyright (C) 2008 Ke Xu
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//-------------------------------------------------------------------------------------------------
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// Description
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// Decoding total_zeros from Table9-7,Table9-8,Table9-9 of H.264/AVC standard 2003
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//-------------------------------------------------------------------------------------------------
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// synopsys translate_off
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`include "timescale.v"
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// synopsys translate_on
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`include "nova_defines.v"
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module total_zeros_decoding (clk,reset_n,residual_state,cavlc_decoder_state,TotalCoeff_3to0,heading_one_pos,
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BitStream_buffer_output,maxNumCoeff,total_zeros,total_zeros_len);
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input clk,reset_n;
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input [3:0] residual_state;
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input [3:0] cavlc_decoder_state;
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input [3:0] TotalCoeff_3to0;
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input [3:0] heading_one_pos;
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input [15:0] BitStream_buffer_output;
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output [4:0] maxNumCoeff;
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output [3:0] total_zeros;
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output [3:0] total_zeros_len;
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reg [4:0] maxNumCoeff;
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reg [3:0] total_zeros;
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reg [3:0] total_zeros_len;
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reg [3:0] total_zeros_reg;
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always @ (posedge clk)
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if (reset_n == 0)
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maxNumCoeff <= 0;
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else
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case (residual_state)
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`Intra16x16DCLevel_s:maxNumCoeff <= 5'd16;
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`Intra16x16ACLevel_s:maxNumCoeff <= 15;
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`LumaLevel_s :maxNumCoeff <= 5'd16;
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`ChromaDCLevel_Cb_s :maxNumCoeff <= 4;
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`ChromaDCLevel_Cr_s :maxNumCoeff <= 4;
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`ChromaACLevel_Cb_s :maxNumCoeff <= 15;
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`ChromaACLevel_Cr_s :maxNumCoeff <= 15;
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endcase
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//total_zeros_len
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always @ (cavlc_decoder_state or maxNumCoeff or TotalCoeff_3to0 or heading_one_pos or BitStream_buffer_output)
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if (cavlc_decoder_state == `total_zeros_LUT)
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begin
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if (maxNumCoeff == 4)
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case (TotalCoeff_3to0)
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1:if (heading_one_pos == 0) total_zeros_len <= 1;
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else if (heading_one_pos == 1) total_zeros_len <= 2;
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else total_zeros_len <= 3;
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2:if (heading_one_pos == 0) total_zeros_len <= 1;
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else total_zeros_len <= 2;
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3: total_zeros_len <= 1;
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default: total_zeros_len <= 0;
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endcase
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else
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case (TotalCoeff_3to0)
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1:if (heading_one_pos == 0) total_zeros_len <= 1;
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else if (heading_one_pos == 8) total_zeros_len <= 4'd9;
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else total_zeros_len <= heading_one_pos + 2;
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2:if (heading_one_pos == 0) total_zeros_len <= 4'd3;
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else if (heading_one_pos == 1)
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total_zeros_len <= (BitStream_buffer_output[13] == 1'b1)? 4'd3:4'd4;
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else if (heading_one_pos == 2) total_zeros_len <= 4;
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else if (heading_one_pos == 3) total_zeros_len <= 5;
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else if (heading_one_pos == 4) total_zeros_len <= 6;
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else total_zeros_len <= 6;
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3:if (heading_one_pos == 0) total_zeros_len <= 4'd3;
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else if (heading_one_pos == 1)
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total_zeros_len <= (BitStream_buffer_output[13] == 1'b1)? 4'd3:4'd4;
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else if (heading_one_pos == 2) total_zeros_len <= 4;
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else if (heading_one_pos == 3) total_zeros_len <= 5;
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else if (heading_one_pos == 4) total_zeros_len <= 5;
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else total_zeros_len <= 4'd6;
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4:if (heading_one_pos == 0) total_zeros_len <= 3;
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else if (heading_one_pos == 1)
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total_zeros_len <= (BitStream_buffer_output[13] == 1'b1)? 4'd3:4'd4;
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else if (heading_one_pos == 2) total_zeros_len <= 4;
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else if (heading_one_pos == 3) total_zeros_len <= 5;
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else total_zeros_len <= 5;
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5:if (heading_one_pos == 0) total_zeros_len <= 4'd3;
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else if (heading_one_pos == 1)
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total_zeros_len <= (BitStream_buffer_output[13] == 1'b1)? 4'd3:4'd4;
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else if (heading_one_pos == 2) total_zeros_len <= 4;
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else if (heading_one_pos == 3) total_zeros_len <= 4;
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else total_zeros_len <= 5;
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6:if (heading_one_pos == 0 || heading_one_pos == 1 || heading_one_pos ==2)
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total_zeros_len <= 3;
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else if (heading_one_pos == 3) total_zeros_len <= 4;
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else if (heading_one_pos == 4) total_zeros_len <= 5;
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else total_zeros_len <= 6;
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7:if (heading_one_pos == 0 && BitStream_buffer_output[14] == 1)
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total_zeros_len <= 2;
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else if (heading_one_pos == 0 || heading_one_pos == 1 || heading_one_pos == 2)
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total_zeros_len <= 3;
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else if (heading_one_pos == 3) total_zeros_len <= 4;
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else if (heading_one_pos == 4) total_zeros_len <= 5;
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else total_zeros_len <= 6;
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8:if (heading_one_pos == 0) total_zeros_len <= 2;
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else if (heading_one_pos == 1 || heading_one_pos == 2)
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total_zeros_len <= 3;
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else if (heading_one_pos == 3) total_zeros_len <= 4;
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else if (heading_one_pos == 4) total_zeros_len <= 5;
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else total_zeros_len <= 6;
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9:if (heading_one_pos == 0 || heading_one_pos == 1)
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total_zeros_len <= 2;
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else if (heading_one_pos == 2) total_zeros_len <= 3;
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else if (heading_one_pos == 3) total_zeros_len <= 4;
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else if (heading_one_pos == 4) total_zeros_len <= 5;
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else total_zeros_len <= 6;
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10:if (heading_one_pos == 0 || heading_one_pos == 1)
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total_zeros_len <= 2;
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else if (heading_one_pos == 2) total_zeros_len <= 3;
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else if (heading_one_pos == 3) total_zeros_len <= 4;
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else total_zeros_len <= 5;
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11:if (heading_one_pos == 0) total_zeros_len <= 1;
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else if (heading_one_pos == 1 || heading_one_pos == 2)
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total_zeros_len <= 3;
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else total_zeros_len <= 4;
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12:if (heading_one_pos == 0 || heading_one_pos == 1 || heading_one_pos == 2 || heading_one_pos == 3)
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total_zeros_len <= heading_one_pos + 1;
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else total_zeros_len <= 4;
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13:if (heading_one_pos == 0 || heading_one_pos == 1 || heading_one_pos == 2)
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total_zeros_len <= heading_one_pos + 1;
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else total_zeros_len <= 3;
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14:if (heading_one_pos == 0) total_zeros_len <= 1;
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else total_zeros_len <= 2;
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15:total_zeros_len <= 1;
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default:total_zeros_len <= 0;
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endcase
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end
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else
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total_zeros_len <= 0;
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//total_zeros
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wire total_zeros_t0,total_zeros_t1;
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assign total_zeros_t0 = (cavlc_decoder_state == `total_zeros_LUT && maxNumCoeff != 4); //Table 9-7,9-8
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assign total_zeros_t1 = (cavlc_decoder_state == `total_zeros_LUT && maxNumCoeff == 4); //Table 9-9
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always @ (total_zeros_t0 or total_zeros_t1 or TotalCoeff_3to0 or heading_one_pos
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or BitStream_buffer_output or total_zeros_reg)
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if (total_zeros_t0)
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case (TotalCoeff_3to0)
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1:
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if (heading_one_pos == 4'd0)
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total_zeros <= 4'd0;
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else if (heading_one_pos == 4'd1)
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total_zeros <= (BitStream_buffer_output[13])? 4'd1:4'd2;
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else if (heading_one_pos == 4'd2)
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total_zeros <= (BitStream_buffer_output[12])? 4'd3:4'd4;
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else if (heading_one_pos == 4'd3)
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total_zeros <= (BitStream_buffer_output[11])? 4'd5:4'd6;
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else if (heading_one_pos == 4'd4)
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total_zeros <= (BitStream_buffer_output[10])? 4'd7:4'd8;
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else if (heading_one_pos == 4'd5)
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total_zeros <= (BitStream_buffer_output[9])? 4'd9:4'd10;
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else if (heading_one_pos == 4'd6)
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total_zeros <= (BitStream_buffer_output[8])? 4'd11:4'd12;
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else if (heading_one_pos == 4'd7)
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total_zeros <= (BitStream_buffer_output[7])? 4'd13:4'd14;
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else
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total_zeros <= 4'd15;
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2:
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if (heading_one_pos == 4'd0)
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total_zeros <= {2'b0,~BitStream_buffer_output[14:13]};
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else if (heading_one_pos == 4'd1)
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case (BitStream_buffer_output[13:12])
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2'b01:total_zeros <= 4'd5;
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2'b00:total_zeros <= 4'd6;
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default:total_zeros <= 4'd4;
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endcase
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else if (heading_one_pos == 4'd2)
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total_zeros <= (BitStream_buffer_output[12])? 4'd7:4'd8;
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else if (heading_one_pos == 4'd3)
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total_zeros <= (BitStream_buffer_output[11])? 4'd9:4'd10;
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else if (heading_one_pos == 4'd4)
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total_zeros <= (BitStream_buffer_output[10])? 4'd11:4'd12;
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else if (heading_one_pos == 4'd5)
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total_zeros <= 4'd13;
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else
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total_zeros <= 4'd14;
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3:
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if (heading_one_pos == 4'd0)
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case (BitStream_buffer_output[14:13])
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2'b00:total_zeros <= 4'd6;
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2'b01:total_zeros <= 4'd3;
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2'b10:total_zeros <= 4'd2;
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2'b11:total_zeros <= 4'd1;
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endcase
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else if (heading_one_pos == 4'd1)
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case (BitStream_buffer_output[13:12])
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2'b00:total_zeros <= 4'd4;
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2'b01:total_zeros <= 4'd0;
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default:total_zeros <= 4'd7;
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endcase
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else if (heading_one_pos == 4'd2)
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total_zeros <= (BitStream_buffer_output[12])? 4'd5:4'd8;
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else if (heading_one_pos == 4'd3)
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total_zeros <= (BitStream_buffer_output[11])? 4'd9:4'd10;
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else if (heading_one_pos == 4'd4)
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total_zeros <= 4'd12;
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else if (heading_one_pos == 4'd5)
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total_zeros <= 4'd11;
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else
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total_zeros <= 4'd13;
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4:
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if (heading_one_pos == 4'd0)
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case (BitStream_buffer_output[14:13])
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2'b00:total_zeros <= 4'd6;
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2'b01:total_zeros <= 4'd5;
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2'b10:total_zeros <= 4'd4;
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2'b11:total_zeros <= 4'd1;
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endcase
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else if (heading_one_pos == 4'd1)
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case (BitStream_buffer_output[13:12])
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2'b00:total_zeros <= 4'd3;
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2'b01:total_zeros <= 4'd2;
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default:total_zeros <= 4'd8;
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endcase
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else if (heading_one_pos == 4'd2)
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total_zeros <= (BitStream_buffer_output[12])? 4'd7:4'd9;
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else if (heading_one_pos == 4'd3)
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total_zeros <= (BitStream_buffer_output[11])? 4'd0:4'd10;
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else if (heading_one_pos == 4'd4)
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total_zeros <= 4'd11;
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else
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total_zeros <= 4'd12;
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5:
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if (heading_one_pos == 4'd0)
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case (BitStream_buffer_output[14:13])
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2'b00:total_zeros <= 4'd6;
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2'b01:total_zeros <= 4'd5;
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2'b10:total_zeros <= 4'd4;
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2'b11:total_zeros <= 4'd3;
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endcase
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else if (heading_one_pos == 4'd1)
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case (BitStream_buffer_output[13:12])
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2'b00:total_zeros <= 4'd1;
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2'b01:total_zeros <= 4'd0;
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default:total_zeros <= 4'd7;
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endcase
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else if (heading_one_pos == 4'd2)
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total_zeros <= (BitStream_buffer_output[12])? 4'd2:4'd8;
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else if (heading_one_pos == 4'd3)
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total_zeros <= 4'd10;
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else if (heading_one_pos == 4'd4)
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total_zeros <= 4'd9;
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else
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total_zeros <= 4'd11;
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6:
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if (heading_one_pos == 4'd0)
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case (BitStream_buffer_output[14:13])
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2'b00:total_zeros <= 4'd5;
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2'b01:total_zeros <= 4'd4;
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2'b10:total_zeros <= 4'd3;
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2'b11:total_zeros <= 4'd2;
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endcase
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else if (heading_one_pos == 4'd1)
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total_zeros <= (BitStream_buffer_output[13])? 4'd6:4'd7;
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else if (heading_one_pos == 4'd2)
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total_zeros <= 4'd9;
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else if (heading_one_pos == 4'd3)
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total_zeros <= 4'd8;
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else if (heading_one_pos == 4'd4)
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total_zeros <= 4'd1;
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else if (heading_one_pos == 4'd5)
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total_zeros <= 4'd0;
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else
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total_zeros <= 4'd10;
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7:
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if (heading_one_pos == 4'd0)
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case (BitStream_buffer_output[14:13])
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|
|
2'b00:total_zeros <= 4'd3;
|
| 279 |
|
|
2'b01:total_zeros <= 4'd2;
|
| 280 |
|
|
default:total_zeros <= 4'd5;
|
| 281 |
|
|
endcase
|
| 282 |
|
|
else if (heading_one_pos == 4'd1)
|
| 283 |
|
|
total_zeros <= (BitStream_buffer_output[13])? 4'd4:4'd6;
|
| 284 |
|
|
else if (heading_one_pos == 4'd2)
|
| 285 |
|
|
total_zeros <= 4'd8;
|
| 286 |
|
|
else if (heading_one_pos == 4'd3)
|
| 287 |
|
|
total_zeros <= 4'd7;
|
| 288 |
|
|
else if (heading_one_pos == 4'd4)
|
| 289 |
|
|
total_zeros <= 4'd1;
|
| 290 |
|
|
else if (heading_one_pos == 4'd5)
|
| 291 |
|
|
total_zeros <= 4'd0;
|
| 292 |
|
|
else
|
| 293 |
|
|
total_zeros <= 4'd9;
|
| 294 |
|
|
8:
|
| 295 |
|
|
if (heading_one_pos == 4'd0)
|
| 296 |
|
|
total_zeros <= (BitStream_buffer_output[14])? 4'd4:4'd5;
|
| 297 |
|
|
else if (heading_one_pos == 4'd1)
|
| 298 |
|
|
total_zeros <= (BitStream_buffer_output[13])? 4'd3:4'd6;
|
| 299 |
|
|
else if (heading_one_pos == 4'd2)
|
| 300 |
|
|
total_zeros <= 4'd7;
|
| 301 |
|
|
else if (heading_one_pos == 4'd3)
|
| 302 |
|
|
total_zeros <= 4'd1;
|
| 303 |
|
|
else if (heading_one_pos == 4'd4)
|
| 304 |
|
|
total_zeros <= 4'd2;
|
| 305 |
|
|
else if (heading_one_pos == 4'd5)
|
| 306 |
|
|
total_zeros <= 4'd0;
|
| 307 |
|
|
else
|
| 308 |
|
|
total_zeros <= 4'd8;
|
| 309 |
|
|
9:
|
| 310 |
|
|
if (heading_one_pos == 4'd0)
|
| 311 |
|
|
total_zeros <= (BitStream_buffer_output[14])? 4'd3:4'd4;
|
| 312 |
|
|
else if (heading_one_pos == 4'd1)
|
| 313 |
|
|
total_zeros <= 4'd6;
|
| 314 |
|
|
else if (heading_one_pos == 4'd2)
|
| 315 |
|
|
total_zeros <= 4'd5;
|
| 316 |
|
|
else if (heading_one_pos == 4'd3)
|
| 317 |
|
|
total_zeros <= 4'd2;
|
| 318 |
|
|
else if (heading_one_pos == 4'd4)
|
| 319 |
|
|
total_zeros <= 4'd7;
|
| 320 |
|
|
else if (heading_one_pos == 4'd5)
|
| 321 |
|
|
total_zeros <= 4'd0;
|
| 322 |
|
|
else
|
| 323 |
|
|
total_zeros <= 4'd1;
|
| 324 |
|
|
10:
|
| 325 |
|
|
if (heading_one_pos == 4'd0)
|
| 326 |
|
|
total_zeros <= (BitStream_buffer_output[14])? 4'd3:4'd4;
|
| 327 |
|
|
else if (heading_one_pos == 4'd1)
|
| 328 |
|
|
total_zeros <= 4'd5;
|
| 329 |
|
|
else if (heading_one_pos == 4'd2)
|
| 330 |
|
|
total_zeros <= 4'd2;
|
| 331 |
|
|
else if (heading_one_pos == 4'd3)
|
| 332 |
|
|
total_zeros <= 4'd6;
|
| 333 |
|
|
else if (heading_one_pos == 4'd4)
|
| 334 |
|
|
total_zeros <= 4'd0;
|
| 335 |
|
|
else
|
| 336 |
|
|
total_zeros <= 4'd1;
|
| 337 |
|
|
11:
|
| 338 |
|
|
if (heading_one_pos == 4'd0)
|
| 339 |
|
|
total_zeros <= 4'd4;
|
| 340 |
|
|
else if (heading_one_pos == 4'd1)
|
| 341 |
|
|
total_zeros <= (BitStream_buffer_output[13])? 4'd5:4'd3;
|
| 342 |
|
|
else if (heading_one_pos == 4'd2)
|
| 343 |
|
|
total_zeros <= 4'd2;
|
| 344 |
|
|
else if (heading_one_pos == 4'd3)
|
| 345 |
|
|
total_zeros <= 4'd1;
|
| 346 |
|
|
else
|
| 347 |
|
|
total_zeros <= 4'd0;
|
| 348 |
|
|
12:
|
| 349 |
|
|
if (heading_one_pos == 4'd0)
|
| 350 |
|
|
total_zeros <= 4'd3;
|
| 351 |
|
|
else if (heading_one_pos == 4'd1)
|
| 352 |
|
|
total_zeros <= 4'd2;
|
| 353 |
|
|
else if (heading_one_pos == 4'd2)
|
| 354 |
|
|
total_zeros <= 4'd4;
|
| 355 |
|
|
else if (heading_one_pos == 4'd3)
|
| 356 |
|
|
total_zeros <= 4'd1;
|
| 357 |
|
|
else
|
| 358 |
|
|
total_zeros <= 4'd0;
|
| 359 |
|
|
13:
|
| 360 |
|
|
if (heading_one_pos == 4'd0)
|
| 361 |
|
|
total_zeros <= 4'd2;
|
| 362 |
|
|
else if (heading_one_pos == 4'd1)
|
| 363 |
|
|
total_zeros <= 4'd3;
|
| 364 |
|
|
else if (heading_one_pos == 4'd2)
|
| 365 |
|
|
total_zeros <= 4'd1;
|
| 366 |
|
|
else
|
| 367 |
|
|
total_zeros <= 4'd0;
|
| 368 |
|
|
14:
|
| 369 |
|
|
if (heading_one_pos == 4'd0)
|
| 370 |
|
|
total_zeros <= 4'd2;
|
| 371 |
|
|
else if (heading_one_pos == 4'd1)
|
| 372 |
|
|
total_zeros <= 4'd1;
|
| 373 |
|
|
else
|
| 374 |
|
|
total_zeros <= 4'd0;
|
| 375 |
|
|
default:total_zeros <= (heading_one_pos == 4'd0)? 4'd1:4'd0;
|
| 376 |
|
|
endcase
|
| 377 |
|
|
else if (total_zeros_t1)
|
| 378 |
|
|
case (TotalCoeff_3to0)
|
| 379 |
|
|
1:if (heading_one_pos == 4'd0) total_zeros <= 4'd0;
|
| 380 |
|
|
else if (heading_one_pos == 4'd1) total_zeros <= 4'd1;
|
| 381 |
|
|
else if (heading_one_pos == 4'd2) total_zeros <= 4'd2;
|
| 382 |
|
|
else total_zeros <= 4'd3;
|
| 383 |
|
|
2:if (heading_one_pos == 4'd0) total_zeros <= 4'd0;
|
| 384 |
|
|
else if (heading_one_pos == 4'd1) total_zeros <= 4'd1;
|
| 385 |
|
|
else total_zeros <= 4'd2;
|
| 386 |
|
|
3:total_zeros <= {3'b0,~BitStream_buffer_output[15]};
|
| 387 |
|
|
default:total_zeros <= 0;
|
| 388 |
|
|
endcase
|
| 389 |
|
|
else
|
| 390 |
|
|
total_zeros <= total_zeros_reg;
|
| 391 |
|
|
|
| 392 |
|
|
always @ (posedge clk)
|
| 393 |
|
|
if (reset_n == 0)
|
| 394 |
|
|
total_zeros_reg <= 0;
|
| 395 |
|
|
else if (cavlc_decoder_state == `total_zeros_LUT)
|
| 396 |
|
|
total_zeros_reg <= total_zeros;
|
| 397 |
|
|
|
| 398 |
|
|
endmodule
|
| 399 |
|
|
|
| 400 |
|
|
|
