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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 : run_decoding.v
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// Generated : June 11, 2005
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// Copyright (C) 2008 Ke Xu
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//-------------------------------------------------------------------------------------------------
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// Description
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// Decoding the all the remaining syntax for CAVLC
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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 run_decoding (clk,reset_n,cavlc_decoder_state,BitStream_buffer_output,total_zeros,
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level_0,level_1,level_2,level_3,level_4,level_5,level_6,level_7,
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level_8,level_9,level_10,level_11,level_12,level_13,level_14,level_15,
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TotalCoeff,i_run,i_TotalCoeff,coeffNum,IsRunLoop,
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run_of_zeros_len,zerosLeft,run,
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coeffLevel_0,coeffLevel_1,coeffLevel_2, coeffLevel_3, coeffLevel_4, coeffLevel_5, coeffLevel_6, coeffLevel_7,
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coeffLevel_8,coeffLevel_9,coeffLevel_10,coeffLevel_11,coeffLevel_12,coeffLevel_13,coeffLevel_14,coeffLevel_15);
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input clk,reset_n;
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input [3:0] cavlc_decoder_state;
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input [15:0] BitStream_buffer_output;
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input [3:0] total_zeros;
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input [8:0] level_0,level_1,level_2,level_3,level_4,level_5,level_6,level_7;
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input [8:0] level_8,level_9,level_10,level_11,level_12,level_13,level_14,level_15;
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input [4:0] TotalCoeff;
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input [3:0] i_run;
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input [3:0] i_TotalCoeff;
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input [3:0] coeffNum;
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input IsRunLoop;
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output [3:0] run_of_zeros_len;
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output [3:0] zerosLeft;
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output [3:0] run;
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output [8:0] coeffLevel_0, coeffLevel_1, coeffLevel_2,coeffLevel_3, coeffLevel_4, coeffLevel_5, coeffLevel_6;
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output [8:0] coeffLevel_7, coeffLevel_8, coeffLevel_9,coeffLevel_10,coeffLevel_11,coeffLevel_12,coeffLevel_13;
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output [8:0] coeffLevel_14,coeffLevel_15;
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reg [3:0] run_of_zeros_len;
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reg [3:0] zerosLeft;
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reg [3:0] run;
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reg [8:0] coeffLevel_0, coeffLevel_1, coeffLevel_2,coeffLevel_3, coeffLevel_4, coeffLevel_5, coeffLevel_6;
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reg [8:0] coeffLevel_7, coeffLevel_8, coeffLevel_9,coeffLevel_10,coeffLevel_11,coeffLevel_12,coeffLevel_13;
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reg [8:0] coeffLevel_14,coeffLevel_15;
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reg [3:0] run_before;
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reg [3:0] zerosLeft_reg;
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reg [3:0] run_0,run_1,run_2,run_3,run_4,run_5,run_6,run_7;
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reg [3:0] run_8,run_9,run_10,run_11,run_12,run_13,run_14,run_15;
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reg [8:0] level_output;
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//decoding Table 9-10
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always @ (cavlc_decoder_state or zerosLeft or BitStream_buffer_output)
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if (cavlc_decoder_state == `run_before_LUT)
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case (zerosLeft)
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0:run_of_zeros_len <= 0;//special case added for "total_zeros==0"
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1:run_of_zeros_len <= 1;
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2:run_of_zeros_len <= (BitStream_buffer_output[15] == 1)? 4'd1:4'd2;
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3:run_of_zeros_len <= 2;
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4:run_of_zeros_len <= (BitStream_buffer_output[15:14] == 2'b00)? 4'd3:4'd2;
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5:run_of_zeros_len <= (BitStream_buffer_output[15] == 1)? 4'd2:4'd3;
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6:run_of_zeros_len <= (BitStream_buffer_output[15:14] == 2'b11)? 4'd2:4'd3;
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default:
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if (BitStream_buffer_output[15] == 1 || BitStream_buffer_output[14] == 1 || BitStream_buffer_output[13] == 1)
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run_of_zeros_len <= 3;
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else if (BitStream_buffer_output[15:12] == 1) run_of_zeros_len <= 4;
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else if (BitStream_buffer_output[15:11] == 1) run_of_zeros_len <= 5;
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else if (BitStream_buffer_output[15:10] == 1) run_of_zeros_len <= 6;
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else if (BitStream_buffer_output[15:9] == 1) run_of_zeros_len <= 7;
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else if (BitStream_buffer_output[15:8] == 1) run_of_zeros_len <= 4'd8;
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else if (BitStream_buffer_output[15:7] == 1) run_of_zeros_len <= 4'd9;
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else if (BitStream_buffer_output[15:6] == 1) run_of_zeros_len <= 4'd10;
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else if (BitStream_buffer_output[15:5] == 1) run_of_zeros_len <= 4'd11;
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else run_of_zeros_len <= 0;
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endcase
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else
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run_of_zeros_len <= 0;
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always @ (posedge clk)
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if (reset_n == 0)
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run_before <= 0;
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else if (cavlc_decoder_state == `run_before_LUT)
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case (zerosLeft)
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0:run_before <= 0;//special case added for "total_zeros==0"
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1:run_before <= (BitStream_buffer_output[15] == 0)? 4'd1:4'd0;
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2:if (BitStream_buffer_output[15] == 1) run_before <= 0;
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else if (BitStream_buffer_output[15:14] == 2'b01) run_before <= 1;
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else run_before <= 2;
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3:case (BitStream_buffer_output[15:14])
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2'b00:run_before <= 3;
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2'b01:run_before <= 2;
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2'b10:run_before <= 1;
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2'b11:run_before <= 0;
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endcase
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4:case (BitStream_buffer_output[15:14])
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2'b00:run_before <= (BitStream_buffer_output[13] == 1)? 4'd3:4'd4;
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2'b01:run_before <= 2;
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2'b10:run_before <= 1;
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2'b11:run_before <= 0;
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endcase
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5:case (BitStream_buffer_output[15:14])
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2'b00:run_before <= (BitStream_buffer_output[13] == 1)? 4'd4:4'd5;
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2'b01:run_before <= (BitStream_buffer_output[13] == 1)? 4'd2:4'd3;
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2'b10:run_before <= 1;
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2'b11:run_before <= 0;
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endcase
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6:casex (BitStream_buffer_output[15:13])
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3'b11x:run_before <= 0;
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3'b000:run_before <= 1;
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3'b001:run_before <= 2;
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3'b011:run_before <= 3;
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3'b010:run_before <= 4;
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3'b101:run_before <= 5;
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3'b100:run_before <= 6;
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endcase
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default:
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case (BitStream_buffer_output[15:13])
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3'b000:run_before <= run_of_zeros_len + 3;
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3'b111:run_before <= 0;
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3'b110:run_before <= 1;
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3'b101:run_before <= 2;
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3'b100:run_before <= 3;
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3'b011:run_before <= 4;
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3'b010:run_before <= 5;
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3'b001:run_before <= 6;
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endcase
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endcase
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always @ (cavlc_decoder_state or total_zeros or run_before or zerosLeft_reg or IsRunLoop)
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if (cavlc_decoder_state == `run_before_LUT)
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zerosLeft <= (IsRunLoop == 0)? total_zeros:zerosLeft_reg;
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else if (cavlc_decoder_state == `RunOfZeros)
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zerosLeft <= zerosLeft_reg - run_before;
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else
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zerosLeft <= 0;
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always @ (posedge clk)
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if (reset_n == 0)
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zerosLeft_reg <= 0;
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else if (cavlc_decoder_state == `run_before_LUT || cavlc_decoder_state == `RunOfZeros)
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zerosLeft_reg <= zerosLeft;
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always @ (posedge clk)
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if (reset_n == 0)
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begin
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run_0 <= 0; run_1 <= 0; run_2 <= 0; run_3 <= 0;
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run_4 <= 0; run_5 <= 0; run_6 <= 0; run_7 <= 0;
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run_8 <= 0; run_9 <= 0; run_10 <= 0; run_11 <= 0;
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run_12 <= 0; run_13 <= 0; run_14 <= 0; run_15 <= 0;
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end
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//reset run0 ~ run15 for each 4x4 CAVLC as early as nAnB_decoding_s stage
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else if (cavlc_decoder_state == `nAnB_decoding_s)
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begin
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run_0 <= 0; run_1 <= 0; run_2 <= 0; run_3 <= 0;
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run_4 <= 0; run_5 <= 0; run_6 <= 0; run_7 <= 0;
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run_8 <= 0; run_9 <= 0; run_10 <= 0; run_11 <= 0;
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run_12 <= 0; run_13 <= 0; run_14 <= 0; run_15 <= 0;
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end
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else if (cavlc_decoder_state == `RunOfZeros)
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begin
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if (TotalCoeff == 1)
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run_0 <= total_zeros;
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else if (total_zeros == 0)
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begin
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run_0 <= 0; run_1 <= 0; run_2 <= 0; run_3 <= 0;
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run_4 <= 0; run_5 <= 0; run_6 <= 0; run_7 <= 0;
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run_8 <= 0; run_9 <= 0; run_10 <= 0; run_11 <= 0;
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run_12 <= 0; run_13 <= 0; run_14 <= 0; run_15 <= 0;
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end
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else if ({1'b0,i_run} == TotalCoeff - 2)
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case (i_run)
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1 :begin run_1 <= run_before; run_2 <= zerosLeft; end
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2 :begin run_2 <= run_before; run_3 <= zerosLeft; end
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3 :begin run_3 <= run_before; run_4 <= zerosLeft; end
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4 :begin run_4 <= run_before; run_5 <= zerosLeft; end
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5 :begin run_5 <= run_before; run_6 <= zerosLeft; end
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6 :begin run_6 <= run_before; run_7 <= zerosLeft; end
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7 :begin run_7 <= run_before; run_8 <= zerosLeft; end
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8 :begin run_8 <= run_before; run_9 <= zerosLeft; end
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9 :begin run_9 <= run_before; run_10<= zerosLeft; end
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10:begin run_10<= run_before; run_11<= zerosLeft; end
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11:begin run_11<= run_before; run_12<= zerosLeft; end
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12:begin run_12<= run_before; run_13<= zerosLeft; end
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13:begin run_13<= run_before; run_14<= zerosLeft; end
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endcase
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else
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case (i_run)
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1 :run_1 <= run_before;
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2 :run_2 <= run_before;
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3 :run_3 <= run_before;
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4 :run_4 <= run_before;
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5 :run_5 <= run_before;
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6 :run_6 <= run_before;
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7 :run_7 <= run_before;
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8 :run_8 <= run_before;
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9 :run_9 <= run_before;
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10:run_10<= run_before;
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11:run_11<= run_before;
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12:run_12<= run_before;
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13:run_13<= run_before;
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endcase
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end
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always @ (cavlc_decoder_state or i_TotalCoeff or run_0 or run_1 or run_2 or run_3 or run_4 or
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run_5 or run_6 or run_7 or run_8 or run_9 or run_10 or run_11 or run_12 or run_13 or run_14)
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if (cavlc_decoder_state == `LevelRunCombination)
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case (i_TotalCoeff) //coeffNum = coeffNum + run[i_TotalCoeff-1] + 1;
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1 :run <= run_1;
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2 :run <= run_2;
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3 :run <= run_3;
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4 :run <= run_4;
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5 :run <= run_5;
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6 :run <= run_6;
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7 :run <= run_7;
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8 :run <= run_8;
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9 :run <= run_9;
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10:run <= run_10;
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11:run <= run_11;
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12:run <= run_12;
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13:run <= run_13;
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14:run <= run_14;
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default:run <= 0;
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endcase
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else
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run <= 0;
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always @ (i_TotalCoeff or level_0 or level_1 or level_2 or level_3 or level_4 or level_5 or level_6 or
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level_7 or level_8 or level_9 or level_10 or level_11 or level_12 or level_13 or level_14 or level_15)
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case (i_TotalCoeff)
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1 :level_output <= level_1;
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2 :level_output <= level_2;
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3 :level_output <= level_3;
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4 :level_output <= level_4;
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5 :level_output <= level_5;
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6 :level_output <= level_6;
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7 :level_output <= level_7;
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8 :level_output <= level_8;
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9 :level_output <= level_9;
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10:level_output <= level_10;
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11:level_output <= level_11;
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12:level_output <= level_12;
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13:level_output <= level_13;
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14:level_output <= level_14;
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15:level_output <= level_15;
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endcase
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always @ (posedge clk)
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if (reset_n == 0)
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begin
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coeffLevel_0 <= 0; coeffLevel_1 <= 0; coeffLevel_2 <= 0; coeffLevel_3 <= 0;
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coeffLevel_4 <= 0; coeffLevel_5 <= 0; coeffLevel_6 <= 0; coeffLevel_7 <= 0;
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coeffLevel_8 <= 0; coeffLevel_9 <= 0; coeffLevel_10 <= 0; coeffLevel_11 <= 0;
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coeffLevel_12 <= 0; coeffLevel_13 <= 0; coeffLevel_14 <= 0; coeffLevel_15 <= 0;
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end
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//Revise log: March 24,2006
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//change reset coeffLevel_0 ~ 14 at total_zeros_LUT stage
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| 266 |
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//else if (cavlc_decoder_state == RunOfZeros && //reset coeffLevel_0 ~ 14 only at last RunOfZeros
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// (i_run == TotalCoeff - 1 || i_run == TotalCoeff - 2 || zerosLeft == 0))
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else if (cavlc_decoder_state == `total_zeros_LUT)
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begin
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coeffLevel_0 <= 0; coeffLevel_1 <= 0; coeffLevel_2 <= 0; coeffLevel_3 <= 0;
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coeffLevel_4 <= 0; coeffLevel_5 <= 0; coeffLevel_6 <= 0; coeffLevel_7 <= 0;
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| 272 |
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coeffLevel_8 <= 0; coeffLevel_9 <= 0; coeffLevel_10 <= 0; coeffLevel_11 <= 0;
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| 273 |
|
|
coeffLevel_12 <= 0; coeffLevel_13 <= 0; coeffLevel_14 <= 0; coeffLevel_15 <= 0;
|
| 274 |
|
|
end
|
| 275 |
|
|
else if (cavlc_decoder_state == `LevelRunCombination)
|
| 276 |
|
|
begin
|
| 277 |
|
|
case (coeffNum)
|
| 278 |
|
|
|
| 279 |
|
|
1 :coeffLevel_1 <= level_output;
|
| 280 |
|
|
2 :coeffLevel_2 <= level_output;
|
| 281 |
|
|
3 :coeffLevel_3 <= level_output;
|
| 282 |
|
|
4 :coeffLevel_4 <= level_output;
|
| 283 |
|
|
5 :coeffLevel_5 <= level_output;
|
| 284 |
|
|
6 :coeffLevel_6 <= level_output;
|
| 285 |
|
|
7 :coeffLevel_7 <= level_output;
|
| 286 |
|
|
8 :coeffLevel_8 <= level_output;
|
| 287 |
|
|
9 :coeffLevel_9 <= level_output;
|
| 288 |
|
|
10:coeffLevel_10<= level_output;
|
| 289 |
|
|
11:coeffLevel_11<= level_output;
|
| 290 |
|
|
12:coeffLevel_12<= level_output;
|
| 291 |
|
|
13:coeffLevel_13<= level_output;
|
| 292 |
|
|
14:coeffLevel_14<= level_output;
|
| 293 |
|
|
15:coeffLevel_15<= level_output;
|
| 294 |
|
|
endcase
|
| 295 |
|
|
end
|
| 296 |
|
|
endmodule
|
| 297 |
|
|
|
| 298 |
|
|
|
| 299 |
|
|
|
