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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 : NumCoeffTrailingOnes_decoding.v
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// Generated : June 8, 2005
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// Copyright (C) 2008 Ke Xu
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//-------------------------------------------------------------------------------------------------
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// Description
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// Decoding for Table 9-5 on Page159 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 NumCoeffTrailingOnes_decoding (clk,reset_n,cavlc_decoder_state,heading_one_pos,BitStream_buffer_output,
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nC,TrailingOnes,TotalCoeff,NumCoeffTrailingOnes_len);
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input clk,reset_n;
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input [3:0] cavlc_decoder_state;
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input [3:0] heading_one_pos;
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input [15:0] BitStream_buffer_output;
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input [4:0] nC;
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output [1:0] TrailingOnes;
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output [4:0] TotalCoeff;
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output [4:0] NumCoeffTrailingOnes_len;
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reg [1:0] TrailingOnes;
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reg [4:0] TotalCoeff;
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reg [4:0] NumCoeffTrailingOnes_len;
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reg [1:0] TrailingOnes_reg;
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reg [4:0] TotalCoeff_reg;
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wire nC_0to2,nC_2to4,nC_4to8,nC_n1,nC_GE8;
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wire nC_0to2_t0,nC_0to2_t1,nC_0to2_t2,nC_0to2_t3;
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wire nC_2to4_t0,nC_2to4_t1,nC_2to4_t2,nC_2to4_t3;
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wire nC_4to8_t0,nC_4to8_t1;
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wire nC_n1_t0;
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//Select nC values to choose table
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assign nC_0to2 = (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT && (nC == 5'd0 || nC == 5'd1));
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assign nC_2to4 = (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT && (nC == 5'd2 || nC == 5'd3));
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assign nC_4to8 = (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT && (nC == 5'd4 || nC == 5'd5 || nC == 5'd6 || nC == 5'd7));
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assign nC_n1 = (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT && (nC == 5'd31));
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assign nC_GE8 = (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT && !nC_0to2 && !nC_2to4 && !nC_4to8 && !nC_n1);
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//1.nC_0to2 t0 ~ t4 sub-table selection
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assign nC_0to2_t0 = (nC_0to2 && (heading_one_pos == 4'd0 || heading_one_pos == 4'd1 || heading_one_pos == 4'd2));
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assign nC_0to2_t1 = (nC_0to2 && (heading_one_pos == 4'd3 || heading_one_pos == 4'd4));
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assign nC_0to2_t2 = (nC_0to2 && (heading_one_pos == 4'd5 || heading_one_pos == 4'd6 || heading_one_pos == 4'd7 || heading_one_pos == 4'd8));
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assign nC_0to2_t3 = (nC_0to2 && (heading_one_pos == 4'd9 || heading_one_pos == 4'd10));
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//2.nC_2to4 t0 ~ t4 sub-table selection
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assign nC_2to4_t0 = (nC_2to4 && (heading_one_pos == 4'd0 || heading_one_pos == 4'd1));
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assign nC_2to4_t1 = (nC_2to4 && (heading_one_pos == 4'd2 || heading_one_pos == 4'd3));
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assign nC_2to4_t2 = (nC_2to4 && (heading_one_pos == 4'd4 || heading_one_pos == 4'd5 || heading_one_pos == 4'd6));
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assign nC_2to4_t3 = (nC_2to4 && (heading_one_pos == 4'd7 || heading_one_pos == 4'd8));
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//3.nC_4to8 t0 ~ t2 sub-table selection
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assign nC_4to8_t0 = (nC_4to8 && heading_one_pos == 4'd0);
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assign nC_4to8_t1 = (nC_4to8 && (heading_one_pos == 4'd1 || heading_one_pos == 4'd2 || heading_one_pos == 4'd3 || heading_one_pos == 4'd4));
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//4.nC_GE8:single table, NO sub-table selection
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//5.nC_n1 t0 ~ t1 sub-table selection
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assign nC_n1_t0 = (nC_n1 && (heading_one_pos == 4'd0 || heading_one_pos == 4'd1 || heading_one_pos == 4'd2));
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//NumCoeffTrailingOnes_len
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always @ (nC_0to2 or nC_2to4 or nC_4to8 or nC_GE8 or nC_n1 or heading_one_pos or BitStream_buffer_output)
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if (nC_0to2)
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case (heading_one_pos)
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1 :NumCoeffTrailingOnes_len <= 5'd2;
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2 :NumCoeffTrailingOnes_len <= 5'd3;
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3 :NumCoeffTrailingOnes_len <= (BitStream_buffer_output[11] == 1)? 5'd5:5'd6;
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4 :NumCoeffTrailingOnes_len <= (BitStream_buffer_output[10] == 1)? 5'd6:5'd7;
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5 :NumCoeffTrailingOnes_len <= 5'd8;
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6 :NumCoeffTrailingOnes_len <= 5'd9;
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7 :NumCoeffTrailingOnes_len <= 5'd10;
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8 :NumCoeffTrailingOnes_len <= 5'd11;
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9 :NumCoeffTrailingOnes_len <= 5'd13;
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10:NumCoeffTrailingOnes_len <= 5'd14;
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11:NumCoeffTrailingOnes_len <= 5'd15;
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12:NumCoeffTrailingOnes_len <= 5'd16;
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13:NumCoeffTrailingOnes_len <= 5'd16;
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14:NumCoeffTrailingOnes_len <= 5'd15;
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default:NumCoeffTrailingOnes_len <= 5'd0;
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endcase
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else if (nC_2to4)
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case (heading_one_pos)
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1 :NumCoeffTrailingOnes_len <= (BitStream_buffer_output[13] == 1)? 5'd3:5'd4;
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2 :NumCoeffTrailingOnes_len <= (BitStream_buffer_output[12] == 1)? 5'd5:5'd6;
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3 :NumCoeffTrailingOnes_len <= 5'd6;
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4 :NumCoeffTrailingOnes_len <= 5'd7;
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5 :NumCoeffTrailingOnes_len <= 5'd8;
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6 :NumCoeffTrailingOnes_len <= 5'd9;
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7 :NumCoeffTrailingOnes_len <= 5'd11;
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8 :NumCoeffTrailingOnes_len <= 5'd12;
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9 :NumCoeffTrailingOnes_len <= 5'd13;
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10:NumCoeffTrailingOnes_len <= (BitStream_buffer_output[4] == 1)? 5'd13:5'd14;
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11:NumCoeffTrailingOnes_len <= 5'd14;
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12:NumCoeffTrailingOnes_len <= 5'd13;
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default:NumCoeffTrailingOnes_len <= 5'd0;
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endcase
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else if (nC_n1)
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case (heading_one_pos)
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0:NumCoeffTrailingOnes_len <= 5'd1;
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1:NumCoeffTrailingOnes_len <= 5'd2;
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2:NumCoeffTrailingOnes_len <= 5'd3;
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3:NumCoeffTrailingOnes_len <= 5'd6;
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4:NumCoeffTrailingOnes_len <= 5'd6;
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5:NumCoeffTrailingOnes_len <= 5'd7;
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6:NumCoeffTrailingOnes_len <= 5'd8;
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default:NumCoeffTrailingOnes_len <= 5'd7;
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endcase
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else if (nC_4to8)
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case (heading_one_pos)
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1 :NumCoeffTrailingOnes_len <= 5'd5;
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2 :NumCoeffTrailingOnes_len <= 5'd6;
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3 :NumCoeffTrailingOnes_len <= 5'd7;
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4 :NumCoeffTrailingOnes_len <= 5'd8;
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5 :NumCoeffTrailingOnes_len <= 5'd9;
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6 :NumCoeffTrailingOnes_len <= (BitStream_buffer_output[8:7] == 2'b11)? 5'd9:5'd10;
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7 :NumCoeffTrailingOnes_len <= 5'd10;
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8 :NumCoeffTrailingOnes_len <= 5'd10;
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9 :NumCoeffTrailingOnes_len <= 5'd10;
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10:NumCoeffTrailingOnes_len <= 5'd10;
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default:NumCoeffTrailingOnes_len <= 5'd0;
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endcase
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else if (nC_GE8)
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NumCoeffTrailingOnes_len <= 5'd6;
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else
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NumCoeffTrailingOnes_len <= 0;
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//TrailingOnes
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always @ (posedge clk)
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if (reset_n == 0)
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TrailingOnes_reg <= 0;
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else if (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT)
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TrailingOnes_reg <= TrailingOnes;
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always @ (nC_0to2 or nC_2to4 or nC_4to8 or nC_n1 or nC_GE8
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or nC_0to2_t0 or nC_0to2_t1 or nC_0to2_t2 or nC_0to2_t3
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or nC_2to4_t0 or nC_2to4_t1 or nC_2to4_t2 or nC_2to4_t3
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or nC_4to8_t0 or nC_4to8_t1 or nC_n1_t0
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or TrailingOnes_reg or heading_one_pos or BitStream_buffer_output)
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if (nC_0to2)
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begin
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if (nC_0to2_t0)
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TrailingOnes <= heading_one_pos[1:0];
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else if (nC_0to2_t1)
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begin
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if (heading_one_pos == 4'd3 && !BitStream_buffer_output[11])
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TrailingOnes <= (BitStream_buffer_output[10])? 2'd0:2'd1;
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else if (heading_one_pos == 4'd4 && BitStream_buffer_output[10:9] == 2'b01)
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TrailingOnes <= 2'd2;
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else
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TrailingOnes <= 2'd3;
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end
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else if (nC_0to2_t2)
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begin
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if (heading_one_pos == 4'd5)
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case (BitStream_buffer_output[9:8])
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2'b00:TrailingOnes <= 2'd3;
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2'b01:TrailingOnes <= 2'd2;
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2'b10:TrailingOnes <= 2'd1;
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2'b11:TrailingOnes <= 2'd0;
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endcase
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else if (heading_one_pos == 4'd6)
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case (BitStream_buffer_output[8:7])
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2'b00:TrailingOnes <= 2'd3;
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2'b01:TrailingOnes <= 2'd2;
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2'b10:TrailingOnes <= 2'd1;
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2'b11:TrailingOnes <= 2'd0;
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endcase
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else if (heading_one_pos == 4'd7)
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case (BitStream_buffer_output[7:6])
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2'b00:TrailingOnes <= 2'd3;
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2'b01:TrailingOnes <= 2'd2;
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2'b10:TrailingOnes <= 2'd1;
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2'b11:TrailingOnes <= 2'd0;
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endcase
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else
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case (BitStream_buffer_output[6:5])
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2'b00:TrailingOnes <= 2'd3;
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2'b01:TrailingOnes <= 2'd2;
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2'b10:TrailingOnes <= 2'd1;
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2'b11:TrailingOnes <= 2'd0;
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endcase
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end
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else if (nC_0to2_t3)
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begin
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if (heading_one_pos == 4'd9)
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case (BitStream_buffer_output[4:3])
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2'b00:TrailingOnes <= (BitStream_buffer_output[5])? 2'd3:2'd0;
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2'b10:TrailingOnes <= 2'd1;
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2'b01:TrailingOnes <= 2'd2;
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2'b11:TrailingOnes <= 2'd0;
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endcase
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else
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case (BitStream_buffer_output[3:2])
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2'b00:TrailingOnes <= 2'd3;
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2'b01:TrailingOnes <= 2'd2;
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2'b10:TrailingOnes <= 2'd1;
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2'b11:TrailingOnes <= 2'd0;
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endcase
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end
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else
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begin
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if ((heading_one_pos == 4'd11 && BitStream_buffer_output[2:1] == 2'b11) ||
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(heading_one_pos == 4'd12 && BitStream_buffer_output[1:0] == 2'b11) ||
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(heading_one_pos == 4'd13 && (BitStream_buffer_output[1:0] == 2'b00 || BitStream_buffer_output[1:0] == 2'b11)))
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TrailingOnes <= 2'd0;
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else if ((heading_one_pos == 4'd11 && BitStream_buffer_output[2:1] == 2'b10) ||
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(heading_one_pos == 4'd12 && BitStream_buffer_output[1:0] == 2'b10) ||
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(heading_one_pos == 4'd13 && BitStream_buffer_output[1:0] == 2'b10) ||
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heading_one_pos == 4'd14)
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TrailingOnes <= 2'd1;
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else if ((heading_one_pos == 4'd11 && BitStream_buffer_output[2:1] == 2'b01) ||
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(heading_one_pos == 4'd12 && BitStream_buffer_output[1:0] == 2'b01) ||
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(heading_one_pos == 4'd13 && BitStream_buffer_output[1:0] == 2'b01))
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TrailingOnes <= 2'd2;
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else
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TrailingOnes <= 2'd3;
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end
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end
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else if (nC_2to4)
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begin
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if (nC_2to4_t0)
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begin
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if (heading_one_pos == 4'd0)
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TrailingOnes <= {1'b0,~BitStream_buffer_output[14]};
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else
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TrailingOnes <= (BitStream_buffer_output[13])? 2'd2:2'd3;
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end
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else if (nC_2to4_t1)
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begin
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if ((heading_one_pos == 4'd2 && BitStream_buffer_output[12:10] == 3'b011) ||
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(heading_one_pos == 4'd3 && BitStream_buffer_output[11:10] == 2'b11))
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TrailingOnes <= 2'd0;
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else if ((heading_one_pos == 4'd2 && (BitStream_buffer_output[12:11] == 2'b11 || BitStream_buffer_output[12:10] == 3'b010)) ||
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(heading_one_pos == 4'd3 && BitStream_buffer_output[11:10] == 2'b10))
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TrailingOnes <= 2'd1;
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else if ((heading_one_pos == 4'd2 && BitStream_buffer_output[12:10] == 3'b001) ||
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(heading_one_pos == 4'd3 && BitStream_buffer_output[11:10] == 2'b01))
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TrailingOnes <= 2'd2;
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else
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TrailingOnes <= 2'd3;
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end
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else if (nC_2to4_t2)
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begin
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if (heading_one_pos == 4'd4)
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case (BitStream_buffer_output[10:9])
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2'b00:TrailingOnes <= 2'd3;
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2'b01:TrailingOnes <= 2'd2;
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2'b10:TrailingOnes <= 2'd1;
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2'b11:TrailingOnes <= 2'd0;
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| 257 |
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endcase
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| 258 |
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else if (heading_one_pos == 4'd5)
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| 259 |
|
|
case (BitStream_buffer_output[9:8])
|
| 260 |
|
|
2'b00:TrailingOnes <= 2'd0;
|
| 261 |
|
|
2'b01:TrailingOnes <= 2'd2;
|
| 262 |
|
|
2'b10:TrailingOnes <= 2'd1;
|
| 263 |
|
|
2'b11:TrailingOnes <= 2'd0;
|
| 264 |
|
|
endcase
|
| 265 |
|
|
else
|
| 266 |
|
|
case (BitStream_buffer_output[8:7])
|
| 267 |
|
|
2'b00:TrailingOnes <= 2'd3;
|
| 268 |
|
|
2'b01:TrailingOnes <= 2'd2;
|
| 269 |
|
|
2'b10:TrailingOnes <= 2'd1;
|
| 270 |
|
|
2'b11:TrailingOnes <= 2'd0;
|
| 271 |
|
|
endcase
|
| 272 |
|
|
end
|
| 273 |
|
|
else if (nC_2to4_t3)
|
| 274 |
|
|
begin
|
| 275 |
|
|
if ((heading_one_pos == 4'd7 && BitStream_buffer_output[6:5] == 2'b11) ||
|
| 276 |
|
|
(heading_one_pos == 4'd8 && (BitStream_buffer_output[5:4] == 2'b11 || BitStream_buffer_output[6:4] == 3'b000)))
|
| 277 |
|
|
TrailingOnes <= 2'd0;
|
| 278 |
|
|
else if ((heading_one_pos == 4'd7 && BitStream_buffer_output[6:5] == 2'b10) ||
|
| 279 |
|
|
(heading_one_pos == 4'd8 && BitStream_buffer_output[5:4] == 2'b10))
|
| 280 |
|
|
TrailingOnes <= 2'd1;
|
| 281 |
|
|
else if ((heading_one_pos == 4'd7 && BitStream_buffer_output[6:5] == 2'b01) ||
|
| 282 |
|
|
(heading_one_pos == 4'd8 && BitStream_buffer_output[5:4] == 2'b01))
|
| 283 |
|
|
TrailingOnes <= 2'd2;
|
| 284 |
|
|
else
|
| 285 |
|
|
TrailingOnes <= 2'd3;
|
| 286 |
|
|
end
|
| 287 |
|
|
else
|
| 288 |
|
|
begin
|
| 289 |
|
|
if ((heading_one_pos == 4'd9 && BitStream_buffer_output[4:3] == 2'b11) ||
|
| 290 |
|
|
(heading_one_pos == 4'd10 && (BitStream_buffer_output[4:3] == 2'b11 || BitStream_buffer_output[4:2] == 3'b001)) ||
|
| 291 |
|
|
(heading_one_pos == 4'd11 && BitStream_buffer_output[3:2] == 2'b11))
|
| 292 |
|
|
TrailingOnes <= 2'd0;
|
| 293 |
|
|
else if ((heading_one_pos == 4'd9 && BitStream_buffer_output[4:3] == 2'b10) ||
|
| 294 |
|
|
(heading_one_pos == 4'd10 && (BitStream_buffer_output[4:2] == 3'b000 || BitStream_buffer_output[4:2] == 3'b011)) ||
|
| 295 |
|
|
(heading_one_pos == 4'd11 && BitStream_buffer_output[3:2] == 2'b10))
|
| 296 |
|
|
TrailingOnes <= 2'd1;
|
| 297 |
|
|
else if ((heading_one_pos == 4'd9 && BitStream_buffer_output[4:3] == 2'b01) ||
|
| 298 |
|
|
(heading_one_pos == 4'd10 && (BitStream_buffer_output[4:3] == 2'b10 || BitStream_buffer_output[4:2] == 3'b010)) ||
|
| 299 |
|
|
(heading_one_pos == 4'd11 && BitStream_buffer_output[3:2] == 2'b01))
|
| 300 |
|
|
TrailingOnes <= 2'd2;
|
| 301 |
|
|
else
|
| 302 |
|
|
TrailingOnes <= 2'd3;
|
| 303 |
|
|
end
|
| 304 |
|
|
end
|
| 305 |
|
|
else if (nC_n1)
|
| 306 |
|
|
begin
|
| 307 |
|
|
if (nC_n1_t0)
|
| 308 |
|
|
begin
|
| 309 |
|
|
if (BitStream_buffer_output[15]) TrailingOnes <= 2'd1;
|
| 310 |
|
|
else if (BitStream_buffer_output[14]) TrailingOnes <= 2'd0;
|
| 311 |
|
|
else TrailingOnes <= 2'd2;
|
| 312 |
|
|
end
|
| 313 |
|
|
else
|
| 314 |
|
|
begin
|
| 315 |
|
|
if ((heading_one_pos == 4'd3 && (BitStream_buffer_output[11:10] == 2'b00 || BitStream_buffer_output[11:10] == 2'b11)) ||
|
| 316 |
|
|
heading_one_pos == 4'd4)
|
| 317 |
|
|
TrailingOnes <= 2'd0;
|
| 318 |
|
|
else if ((heading_one_pos == 4'd3 && BitStream_buffer_output[11:10] == 2'b10) ||
|
| 319 |
|
|
(heading_one_pos == 4'd5 && BitStream_buffer_output[9]) ||
|
| 320 |
|
|
(heading_one_pos == 4'd6 && BitStream_buffer_output[8]))
|
| 321 |
|
|
TrailingOnes <= 2'd1;
|
| 322 |
|
|
else if ((heading_one_pos == 4'd5 && !BitStream_buffer_output[9]) ||
|
| 323 |
|
|
(heading_one_pos == 4'd6 && !BitStream_buffer_output[8]))
|
| 324 |
|
|
TrailingOnes <= 2'd2;
|
| 325 |
|
|
else
|
| 326 |
|
|
TrailingOnes <= 2'd3;
|
| 327 |
|
|
end
|
| 328 |
|
|
end
|
| 329 |
|
|
else if (nC_4to8)
|
| 330 |
|
|
begin
|
| 331 |
|
|
if (nC_4to8_t0)
|
| 332 |
|
|
begin
|
| 333 |
|
|
if (BitStream_buffer_output[14:12] == 3'b111) TrailingOnes <= 2'd0;
|
| 334 |
|
|
else if (BitStream_buffer_output[14:12] == 3'b110) TrailingOnes <= 2'd1;
|
| 335 |
|
|
else if (BitStream_buffer_output[14:12] == 3'b101) TrailingOnes <= 2'd2;
|
| 336 |
|
|
else TrailingOnes <= 2'd3;
|
| 337 |
|
|
end
|
| 338 |
|
|
else if (nC_4to8_t1)
|
| 339 |
|
|
begin
|
| 340 |
|
|
if ((heading_one_pos == 4'd1 &&
|
| 341 |
|
|
(BitStream_buffer_output[13:11] == 3'b000 || BitStream_buffer_output[13:11] == 3'b010 ||
|
| 342 |
|
|
BitStream_buffer_output[13:11] == 3'b100 || BitStream_buffer_output[13:11] == 3'b111)) ||
|
| 343 |
|
|
(heading_one_pos == 4'd2 && BitStream_buffer_output[11:10] == 2'b10 ) ||
|
| 344 |
|
|
(heading_one_pos == 4'd3 && BitStream_buffer_output[11:9] == 3'b110) ||
|
| 345 |
|
|
(heading_one_pos == 4'd4 && BitStream_buffer_output[9:8] == 2'b10 ))
|
| 346 |
|
|
TrailingOnes <= 2'd1;
|
| 347 |
|
|
else if (
|
| 348 |
|
|
(heading_one_pos == 4'd1 && (BitStream_buffer_output[13:11] == 3'b001 || BitStream_buffer_output[13:11] == 3'b011 || BitStream_buffer_output[13:11] == 3'b110))||
|
| 349 |
|
|
(heading_one_pos == 4'd2 && BitStream_buffer_output[11:10] == 2'b01) ||
|
| 350 |
|
|
(heading_one_pos == 4'd3 && (BitStream_buffer_output[11:9] == 3'b010 || BitStream_buffer_output[11:9] == 3'b101))||
|
| 351 |
|
|
(heading_one_pos == 4'd4 && BitStream_buffer_output[9:8] == 2'b01))
|
| 352 |
|
|
TrailingOnes <= 2'd2;
|
| 353 |
|
|
else if (
|
| 354 |
|
|
(heading_one_pos == 4'd1 && BitStream_buffer_output[13:11] == 3'b101) ||
|
| 355 |
|
|
(heading_one_pos == 4'd2 && BitStream_buffer_output[12:10] == 3'b100) ||
|
| 356 |
|
|
(heading_one_pos == 4'd3 && BitStream_buffer_output[11:9] == 3'b100) ||
|
| 357 |
|
|
(heading_one_pos == 4'd4 && BitStream_buffer_output[9:8] == 2'b00))
|
| 358 |
|
|
TrailingOnes <= 2'd3;
|
| 359 |
|
|
else
|
| 360 |
|
|
TrailingOnes <= 2'd0;
|
| 361 |
|
|
end
|
| 362 |
|
|
else
|
| 363 |
|
|
begin
|
| 364 |
|
|
if ((heading_one_pos == 4'd5 && BitStream_buffer_output[8:7] == 2'b10) ||
|
| 365 |
|
|
(heading_one_pos == 4'd6 && (BitStream_buffer_output[8:7] == 2'b11 || BitStream_buffer_output[7:6] == 2'b00)) ||
|
| 366 |
|
|
(heading_one_pos == 4'd7 && BitStream_buffer_output[7:6] == 2'b00))
|
| 367 |
|
|
TrailingOnes <= 2'd1;
|
| 368 |
|
|
else if (
|
| 369 |
|
|
(heading_one_pos == 4'd5 && BitStream_buffer_output[8:7] == 2'b01) ||
|
| 370 |
|
|
(heading_one_pos == 4'd6 && BitStream_buffer_output[8:6] == 3'b011) ||
|
| 371 |
|
|
(heading_one_pos == 4'd7 && BitStream_buffer_output[7:6] == 2'b11) ||
|
| 372 |
|
|
(heading_one_pos == 4'd8 && BitStream_buffer_output[6]))
|
| 373 |
|
|
TrailingOnes <= 2'd2;
|
| 374 |
|
|
else if (
|
| 375 |
|
|
(heading_one_pos == 4'd5 && BitStream_buffer_output[9:7] == 3'b100) ||
|
| 376 |
|
|
(heading_one_pos == 4'd6 && BitStream_buffer_output[8:6] == 3'b010) ||
|
| 377 |
|
|
(heading_one_pos == 4'd7 && BitStream_buffer_output[7:6] == 2'b10) ||
|
| 378 |
|
|
(heading_one_pos == 4'd8 && !BitStream_buffer_output[6]))
|
| 379 |
|
|
TrailingOnes <= 2'd3;
|
| 380 |
|
|
else
|
| 381 |
|
|
TrailingOnes <= 2'd0;
|
| 382 |
|
|
end
|
| 383 |
|
|
end
|
| 384 |
|
|
else if (nC_GE8)
|
| 385 |
|
|
begin
|
| 386 |
|
|
if (BitStream_buffer_output[15:10] == 6'b0 || heading_one_pos == 4'd4)
|
| 387 |
|
|
TrailingOnes <= 2'd0;
|
| 388 |
|
|
else if (heading_one_pos == 4'd5)
|
| 389 |
|
|
TrailingOnes <= 2'd1;
|
| 390 |
|
|
else
|
| 391 |
|
|
TrailingOnes <= BitStream_buffer_output[11:10];
|
| 392 |
|
|
end
|
| 393 |
|
|
else
|
| 394 |
|
|
TrailingOnes <= TrailingOnes_reg;
|
| 395 |
|
|
|
| 396 |
|
|
//TotalCoeff
|
| 397 |
|
|
always @ (posedge clk)
|
| 398 |
|
|
if (reset_n == 0)
|
| 399 |
|
|
TotalCoeff_reg <= 0;
|
| 400 |
|
|
else if (cavlc_decoder_state == `NumCoeffTrailingOnes_LUT)
|
| 401 |
|
|
TotalCoeff_reg <= TotalCoeff;
|
| 402 |
|
|
|
| 403 |
|
|
always @ (nC_0to2 or nC_2to4 or nC_4to8 or nC_n1 or nC_GE8
|
| 404 |
|
|
or nC_0to2_t0 or nC_0to2_t1 or nC_0to2_t2 or nC_0to2_t3
|
| 405 |
|
|
or nC_2to4_t0 or nC_2to4_t1 or nC_2to4_t2 or nC_2to4_t3
|
| 406 |
|
|
or nC_4to8_t0 or nC_4to8_t1 or nC_n1_t0
|
| 407 |
|
|
or TotalCoeff_reg or heading_one_pos or BitStream_buffer_output)
|
| 408 |
|
|
if (nC_0to2)
|
| 409 |
|
|
begin
|
| 410 |
|
|
if (nC_0to2_t0)
|
| 411 |
|
|
TotalCoeff <= {3'b0,heading_one_pos[1:0]};
|
| 412 |
|
|
else if (nC_0to2_t1)
|
| 413 |
|
|
begin
|
| 414 |
|
|
if (heading_one_pos == 4'd3)
|
| 415 |
|
|
case (BitStream_buffer_output[11:10])
|
| 416 |
|
|
2'b00 :TotalCoeff <= 5'd2;
|
| 417 |
|
|
2'b01 :TotalCoeff <= 5'd1;
|
| 418 |
|
|
default:TotalCoeff <= 5'd3;
|
| 419 |
|
|
endcase
|
| 420 |
|
|
else
|
| 421 |
|
|
case (BitStream_buffer_output[10:9])
|
| 422 |
|
|
2'b00 :TotalCoeff <= 5'd5;
|
| 423 |
|
|
2'b01 :TotalCoeff <= 5'd3;
|
| 424 |
|
|
default:TotalCoeff <= 5'd4;
|
| 425 |
|
|
endcase
|
| 426 |
|
|
end
|
| 427 |
|
|
else if (nC_0to2_t2)
|
| 428 |
|
|
begin
|
| 429 |
|
|
if (heading_one_pos == 4'd5)
|
| 430 |
|
|
case (BitStream_buffer_output[9:8])
|
| 431 |
|
|
2'b00:TotalCoeff <= 5'd6;
|
| 432 |
|
|
2'b01:TotalCoeff <= 5'd4;
|
| 433 |
|
|
2'b10:TotalCoeff <= 5'd3;
|
| 434 |
|
|
2'b11:TotalCoeff <= 5'd2;
|
| 435 |
|
|
endcase
|
| 436 |
|
|
else if (heading_one_pos == 4'd6)
|
| 437 |
|
|
case (BitStream_buffer_output[8:7])
|
| 438 |
|
|
2'b00:TotalCoeff <= 5'd7;
|
| 439 |
|
|
2'b01:TotalCoeff <= 5'd5;
|
| 440 |
|
|
2'b10:TotalCoeff <= 5'd4;
|
| 441 |
|
|
2'b11:TotalCoeff <= 5'd3;
|
| 442 |
|
|
endcase
|
| 443 |
|
|
else if (heading_one_pos == 4'd7)
|
| 444 |
|
|
case (BitStream_buffer_output[7:6])
|
| 445 |
|
|
2'b00:TotalCoeff <= 5'd8;
|
| 446 |
|
|
2'b01:TotalCoeff <= 5'd6;
|
| 447 |
|
|
2'b10:TotalCoeff <= 5'd5;
|
| 448 |
|
|
2'b11:TotalCoeff <= 5'd4;
|
| 449 |
|
|
endcase
|
| 450 |
|
|
else
|
| 451 |
|
|
case (BitStream_buffer_output[6:5])
|
| 452 |
|
|
2'b00:TotalCoeff <= 5'd9;
|
| 453 |
|
|
2'b01:TotalCoeff <= 5'd7;
|
| 454 |
|
|
2'b10:TotalCoeff <= 5'd6;
|
| 455 |
|
|
2'b11:TotalCoeff <= 5'd5;
|
| 456 |
|
|
endcase
|
| 457 |
|
|
end
|
| 458 |
|
|
else if (nC_0to2_t3)
|
| 459 |
|
|
begin
|
| 460 |
|
|
if (heading_one_pos == 4'd9)
|
| 461 |
|
|
case (BitStream_buffer_output[5:3])
|
| 462 |
|
|
3'b001 :TotalCoeff <= 5'd9;
|
| 463 |
|
|
3'b011,3'b110:TotalCoeff <= 5'd7;
|
| 464 |
|
|
3'b100 :TotalCoeff <= 5'd10;
|
| 465 |
|
|
3'b111 :TotalCoeff <= 5'd6;
|
| 466 |
|
|
default :TotalCoeff <= 5'd8;
|
| 467 |
|
|
endcase
|
| 468 |
|
|
else
|
| 469 |
|
|
case (BitStream_buffer_output[4:2])
|
| 470 |
|
|
3'b000 :TotalCoeff <= 5'd12;
|
| 471 |
|
|
3'b001,3'b100:TotalCoeff <= 5'd11;
|
| 472 |
|
|
3'b110,3'b111:TotalCoeff <= 5'd9;
|
| 473 |
|
|
default :TotalCoeff <= 5'd10;
|
| 474 |
|
|
endcase
|
| 475 |
|
|
end
|
| 476 |
|
|
else
|
| 477 |
|
|
begin
|
| 478 |
|
|
if (heading_one_pos == 4'd11)
|
| 479 |
|
|
case (BitStream_buffer_output[3:1])
|
| 480 |
|
|
3'b000 :TotalCoeff <= 5'd14;
|
| 481 |
|
|
3'b001,3'b100:TotalCoeff <= 5'd13;
|
| 482 |
|
|
3'b110,3'b111:TotalCoeff <= 5'd11;
|
| 483 |
|
|
default :TotalCoeff <= 5'd12;
|
| 484 |
|
|
endcase
|
| 485 |
|
|
else if (heading_one_pos == 4'd12)
|
| 486 |
|
|
case (BitStream_buffer_output[2:0])
|
| 487 |
|
|
3'b000 :TotalCoeff <= 5'd16;
|
| 488 |
|
|
3'b011,3'b101,3'b110:TotalCoeff <= 5'd14;
|
| 489 |
|
|
3'b111 :TotalCoeff <= 5'd13;
|
| 490 |
|
|
default :TotalCoeff <= 5'd15;
|
| 491 |
|
|
endcase
|
| 492 |
|
|
else if (heading_one_pos == 4'd13)
|
| 493 |
|
|
TotalCoeff <= (BitStream_buffer_output[1:0] == 2'b11)? 5'd15:5'd16;
|
| 494 |
|
|
else
|
| 495 |
|
|
TotalCoeff <= 5'd13;
|
| 496 |
|
|
end
|
| 497 |
|
|
end
|
| 498 |
|
|
else if (nC_2to4)
|
| 499 |
|
|
begin
|
| 500 |
|
|
if (nC_2to4_t0)
|
| 501 |
|
|
begin
|
| 502 |
|
|
if (heading_one_pos == 4'd0)
|
| 503 |
|
|
TotalCoeff <= {4'b0,~BitStream_buffer_output[14]};
|
| 504 |
|
|
else
|
| 505 |
|
|
case (BitStream_buffer_output[13:12])
|
| 506 |
|
|
2'b00 :TotalCoeff <= 5'd4;
|
| 507 |
|
|
2'b01 :TotalCoeff <= 5'd3;
|
| 508 |
|
|
default:TotalCoeff <= 5'd2;
|
| 509 |
|
|
endcase
|
| 510 |
|
|
end
|
| 511 |
|
|
else if (nC_2to4_t1)
|
| 512 |
|
|
begin
|
| 513 |
|
|
if (heading_one_pos == 4'd2)
|
| 514 |
|
|
case (BitStream_buffer_output[12:11])
|
| 515 |
|
|
2'b00:TotalCoeff <= (BitStream_buffer_output[10])? 5'd3:5'd6;
|
| 516 |
|
|
2'b01:TotalCoeff <= (BitStream_buffer_output[10])? 5'd1:5'd3;
|
| 517 |
|
|
2'b10:TotalCoeff <= 5'd5;
|
| 518 |
|
|
2'b11:TotalCoeff <= 5'd2;
|
| 519 |
|
|
endcase
|
| 520 |
|
|
else
|
| 521 |
|
|
case (BitStream_buffer_output[11:10])
|
| 522 |
|
|
2'b00 :TotalCoeff <= 5'd7;
|
| 523 |
|
|
2'b11 :TotalCoeff <= 5'd2;
|
| 524 |
|
|
default:TotalCoeff <= 5'd4;
|
| 525 |
|
|
endcase
|
| 526 |
|
|
end
|
| 527 |
|
|
else if (nC_2to4_t2)
|
| 528 |
|
|
begin
|
| 529 |
|
|
if (heading_one_pos == 4'd4)
|
| 530 |
|
|
case (BitStream_buffer_output[10:9])
|
| 531 |
|
|
2'b00 :TotalCoeff <= 5'd8;
|
| 532 |
|
|
2'b11 :TotalCoeff <= 5'd3;
|
| 533 |
|
|
default:TotalCoeff <= 5'd5;
|
| 534 |
|
|
endcase
|
| 535 |
|
|
else if (heading_one_pos == 4'd5)
|
| 536 |
|
|
case (BitStream_buffer_output[9:8])
|
| 537 |
|
|
2'b00 :TotalCoeff <= 5'd5;
|
| 538 |
|
|
2'b11 :TotalCoeff <= 5'd4;
|
| 539 |
|
|
default:TotalCoeff <= 5'd6;
|
| 540 |
|
|
endcase
|
| 541 |
|
|
else
|
| 542 |
|
|
case (BitStream_buffer_output[8:7])
|
| 543 |
|
|
2'b00 :TotalCoeff <= 5'd9;
|
| 544 |
|
|
2'b11 :TotalCoeff <= 5'd6;
|
| 545 |
|
|
default:TotalCoeff <= 5'd7;
|
| 546 |
|
|
endcase
|
| 547 |
|
|
end
|
| 548 |
|
|
else if (nC_2to4_t3)
|
| 549 |
|
|
begin
|
| 550 |
|
|
if (heading_one_pos == 4'd7)
|
| 551 |
|
|
case (BitStream_buffer_output[7:5])
|
| 552 |
|
|
3'b000 :TotalCoeff <= 5'd11;
|
| 553 |
|
|
3'b001,3'b010:TotalCoeff <= 5'd9;
|
| 554 |
|
|
3'b100 :TotalCoeff <= 5'd10;
|
| 555 |
|
|
3'b111 :TotalCoeff <= 5'd7;
|
| 556 |
|
|
default :TotalCoeff <= 5'd8;
|
| 557 |
|
|
endcase
|
| 558 |
|
|
else
|
| 559 |
|
|
case (BitStream_buffer_output[6:4])
|
| 560 |
|
|
3'b000,3'b001,3'b010:TotalCoeff <= 5'd11;
|
| 561 |
|
|
3'b100 :TotalCoeff <= 5'd12;
|
| 562 |
|
|
3'b111 :TotalCoeff <= 5'd9;
|
| 563 |
|
|
default :TotalCoeff <= 5'd10;
|
| 564 |
|
|
endcase
|
| 565 |
|
|
end
|
| 566 |
|
|
else
|
| 567 |
|
|
begin
|
| 568 |
|
|
if (heading_one_pos == 4'd9)
|
| 569 |
|
|
case (BitStream_buffer_output[5:3])
|
| 570 |
|
|
3'b000 :TotalCoeff <= 5'd14;
|
| 571 |
|
|
3'b101,3'b110,3'b111:TotalCoeff <= 5'd12;
|
| 572 |
|
|
default :TotalCoeff <= 5'd13;
|
| 573 |
|
|
endcase
|
| 574 |
|
|
else if (heading_one_pos == 4'd10)
|
| 575 |
|
|
TotalCoeff <= (BitStream_buffer_output[4:2] == 3'b0 || BitStream_buffer_output[4:2] == 3'b001 || BitStream_buffer_output[4:2] == 3'b010)? 5'd15:5'd14;
|
| 576 |
|
|
else if (heading_one_pos == 4'd11)
|
| 577 |
|
|
TotalCoeff <= 5'd16;
|
| 578 |
|
|
else
|
| 579 |
|
|
TotalCoeff <= 5'd15;
|
| 580 |
|
|
end
|
| 581 |
|
|
end
|
| 582 |
|
|
else if (nC_n1)
|
| 583 |
|
|
begin
|
| 584 |
|
|
if (nC_n1_t0)
|
| 585 |
|
|
begin
|
| 586 |
|
|
if (BitStream_buffer_output[15]) TotalCoeff <= 5'd1;
|
| 587 |
|
|
else if (BitStream_buffer_output[14]) TotalCoeff <= 5'd0;
|
| 588 |
|
|
else TotalCoeff <= 5'd2;
|
| 589 |
|
|
end
|
| 590 |
|
|
else
|
| 591 |
|
|
begin
|
| 592 |
|
|
if (heading_one_pos == 4'd3)
|
| 593 |
|
|
case (BitStream_buffer_output[11:10])
|
| 594 |
|
|
2'b01 :TotalCoeff <= 5'd3;
|
| 595 |
|
|
2'b11 :TotalCoeff <= 5'd1;
|
| 596 |
|
|
default:TotalCoeff <= 5'd2;
|
| 597 |
|
|
endcase
|
| 598 |
|
|
else if (heading_one_pos == 4'd4)
|
| 599 |
|
|
TotalCoeff <= (BitStream_buffer_output[10])? 5'd3:5'd4;
|
| 600 |
|
|
else if (heading_one_pos == 4'd5)
|
| 601 |
|
|
TotalCoeff <= 5'd3;
|
| 602 |
|
|
else
|
| 603 |
|
|
TotalCoeff <= 5'd4;
|
| 604 |
|
|
end
|
| 605 |
|
|
end
|
| 606 |
|
|
else if (nC_4to8)
|
| 607 |
|
|
begin
|
| 608 |
|
|
if (nC_4to8_t0)
|
| 609 |
|
|
TotalCoeff <= {2'b0,~BitStream_buffer_output[14:12]};
|
| 610 |
|
|
else if (nC_4to8_t1)
|
| 611 |
|
|
begin
|
| 612 |
|
|
if (heading_one_pos == 4'd1)
|
| 613 |
|
|
case (BitStream_buffer_output[13:11])
|
| 614 |
|
|
3'b000,3'b001:TotalCoeff <= 5'd5;
|
| 615 |
|
|
3'b010,3'b011:TotalCoeff <= 5'd4;
|
| 616 |
|
|
3'b101 :TotalCoeff <= 5'd8;
|
| 617 |
|
|
3'b111 :TotalCoeff <= 5'd2;
|
| 618 |
|
|
default :TotalCoeff <= 5'd3;
|
| 619 |
|
|
endcase
|
| 620 |
|
|
else if (heading_one_pos == 4'd2)
|
| 621 |
|
|
case (BitStream_buffer_output[12:10])
|
| 622 |
|
|
3'b000 :TotalCoeff <= 5'd3;
|
| 623 |
|
|
3'b001,3'b010:TotalCoeff <= 5'd7;
|
| 624 |
|
|
3'b011 :TotalCoeff <= 5'd2;
|
| 625 |
|
|
3'b100 :TotalCoeff <= 5'd9;
|
| 626 |
|
|
3'b111 :TotalCoeff <= 5'd1;
|
| 627 |
|
|
default :TotalCoeff <= 5'd6;
|
| 628 |
|
|
endcase
|
| 629 |
|
|
else if (heading_one_pos == 4'd3)
|
| 630 |
|
|
case (BitStream_buffer_output[11:9])
|
| 631 |
|
|
3'b000 :TotalCoeff <= 5'd7;
|
| 632 |
|
|
3'b001 :TotalCoeff <= 5'd6;
|
| 633 |
|
|
3'b010 :TotalCoeff <= 5'd9;
|
| 634 |
|
|
3'b011 :TotalCoeff <= 5'd5;
|
| 635 |
|
|
3'b100 :TotalCoeff <= 5'd10;
|
| 636 |
|
|
3'b111 :TotalCoeff <= 5'd4;
|
| 637 |
|
|
default:TotalCoeff <= 5'd8;
|
| 638 |
|
|
endcase
|
| 639 |
|
|
else
|
| 640 |
|
|
case (BitStream_buffer_output[10:8])
|
| 641 |
|
|
3'b000 :TotalCoeff <= 5'd12;
|
| 642 |
|
|
3'b001,3'b100:TotalCoeff <= 5'd11;
|
| 643 |
|
|
3'b010,3'b101:TotalCoeff <= 5'd10;
|
| 644 |
|
|
3'b111 :TotalCoeff <= 5'd8;
|
| 645 |
|
|
default :TotalCoeff <= 5'd9;
|
| 646 |
|
|
endcase
|
| 647 |
|
|
end
|
| 648 |
|
|
else
|
| 649 |
|
|
begin
|
| 650 |
|
|
if (heading_one_pos == 4'd5)
|
| 651 |
|
|
case (BitStream_buffer_output[9:7])
|
| 652 |
|
|
3'b001,3'b100 :TotalCoeff <= 5'd13;
|
| 653 |
|
|
3'b011,3'b110 :TotalCoeff <= 5'd11;
|
| 654 |
|
|
3'b111 :TotalCoeff <= 5'd10;
|
| 655 |
|
|
default :TotalCoeff <= 5'd12;
|
| 656 |
|
|
endcase
|
| 657 |
|
|
else if (heading_one_pos == 4'd6)
|
| 658 |
|
|
case (BitStream_buffer_output[8:6])
|
| 659 |
|
|
3'b000 :TotalCoeff <= 5'd15;
|
| 660 |
|
|
3'b101,3'b110,3'b111:TotalCoeff <= 5'd13;
|
| 661 |
|
|
default :TotalCoeff <= 5'd14;
|
| 662 |
|
|
endcase
|
| 663 |
|
|
else if (heading_one_pos == 4'd7)
|
| 664 |
|
|
TotalCoeff <= (BitStream_buffer_output[7:6] == 2'b00)? 5'd16:5'd15;
|
| 665 |
|
|
else
|
| 666 |
|
|
TotalCoeff <= 5'd16;
|
| 667 |
|
|
end
|
| 668 |
|
|
end
|
| 669 |
|
|
else if (nC_GE8)
|
| 670 |
|
|
begin
|
| 671 |
|
|
if (heading_one_pos == 4'd4)
|
| 672 |
|
|
TotalCoeff <= 5'd0;
|
| 673 |
|
|
else
|
| 674 |
|
|
TotalCoeff <= BitStream_buffer_output[15:12] + 1;
|
| 675 |
|
|
end
|
| 676 |
|
|
else
|
| 677 |
|
|
TotalCoeff <= TotalCoeff_reg;
|
| 678 |
|
|
endmodule
|
