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//////////////////////////////////////////////////////////////////////
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//// ////
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//// cavlc_read_total_coeffs ////
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//// ////
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//// Description ////
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//// decode total_coeffs and trailing ones ////
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//// ////
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//// Author(s): ////
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//// - bin qiu, qiubin@opencores.org ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//// ////
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//// Copyright (C) 2011 Authors and OPENCORES.ORG ////
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//// ////
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//// This source file may be used and distributed without ////
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//// restriction provided that this copyright statement is not ////
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//// removed from the file and that any derivative work contains ////
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//// the original copyright notice and the associated disclaimer. ////
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//// ////
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//// This source file is free software; you can redistribute it ////
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//// and/or modify it under the terms of the GNU Lesser General ////
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//// Public License as published by the Free Software Foundation; ////
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//// either version 2.1 of the License, or (at your option) any ////
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//// later version. ////
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//// ////
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//// This source is distributed in the hope that it will be ////
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//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
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//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
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//// PURPOSE. See the GNU Lesser General Public License for more ////
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//// details. ////
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//// ////
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//// You should have received a copy of the GNU Lesser General ////
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//// Public License along with this source; if not, download it ////
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//// from http://www.opencores.org/lgpl.shtml ////
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//// ////
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//////////////////////////////////////////////////////////////////////
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//2011-8-7 initial creation
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//2011-8-7 initial creation
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//2011-8-9 optimize output mux
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//2011-8-9 optimize output mux
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//2011-9-10 reduce nC to 5 bits
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`include "defines.v"
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`include "defines.v"
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module cavlc_read_total_coeffs(
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module cavlc_read_total_coeffs
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clk, rst_n,
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(
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clk,
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rst_n,
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ena,
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ena,
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start,
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start,
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sel,
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sel,
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rbsp, nC,
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rbsp, nC,
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TrailingOnes,
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TrailingOnes, TotalCoeff,
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TotalCoeff,
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TrailingOnes_comb, TotalCoeff_comb,
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TrailingOnes_comb,
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TotalCoeff_comb,
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len_comb
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len_comb
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);
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);
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//------------------------
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//------------------------
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//ports
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//ports
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//------------------------
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//------------------------
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input clk, rst_n;
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input clk;
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input rst_n;
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input ena;
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input ena;
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input start;
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input start;
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input sel;
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input sel;
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input [0:15] rbsp;
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input [0:15] rbsp;
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input signed [4:0] nC;
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input signed [5:0] nC;
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output [4:0] TotalCoeff; //range from 0 to 16
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output [4:0] TotalCoeff; //range from 0 to 16
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output [1:0] TrailingOnes; //range from 0 to 3
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output [1:0] TrailingOnes; //range from 0 to 3
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output [4:0] TotalCoeff_comb; //unsaved result of TotalCoeff_comb
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output [4:0] TotalCoeff_comb; //unsaved result of TotalCoeff_comb
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output [1:0] TrailingOnes_comb; //unsaved result of TrailingOnes_comb
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output [1:0] TrailingOnes_comb; //unsaved result of TrailingOnes_comb
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reg [1:0] TrailingOnes;
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reg [1:0] TrailingOnes;
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//------------------------
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//------------------------
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//input mux
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//input mux
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//------------------------
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//------------------------
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wire rbsp_refresh = ena && start;
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always @(posedge clk or negedge rst_n)
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always @(posedge clk or negedge rst_n)
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if (!rst_n)
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if (!rst_n)
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begin
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begin
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rbsp_1 <= 0;
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rbsp_1 <= 0;
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rbsp_2 <= 0;
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rbsp_2 <= 0;
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rbsp_3 <= 0;
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rbsp_3 <= 0;
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rbsp_4 <= 0;
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rbsp_4 <= 0;
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rbsp_5 <= 0;
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rbsp_5 <= 0;
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end
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end
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else if (rbsp_refresh)
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else if (ena && start)
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begin
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begin
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if (nC[4])
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if (nC[5])
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rbsp_5 <= rbsp[0:7];
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rbsp_5 <= rbsp[0:7];
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else if (nC[3])
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else if ( nC[4] || nC[3])
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rbsp_4 <= rbsp[0:5];
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rbsp_4 <= rbsp[0:5];
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else if (nC[2])
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else if (nC[2])
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rbsp_3 <= rbsp[0:9];
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rbsp_3 <= rbsp[0:9];
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else if (nC[1])
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else if (nC[1])
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rbsp_2 <= rbsp[0:13];
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rbsp_2 <= rbsp[0:13];
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TrailingOnes_3 <= 0;
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TrailingOnes_3 <= 0;
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TotalCoeff_3 <= 16;
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TotalCoeff_3 <= 16;
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end
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end
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endcase
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endcase
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//------------------ Colum 4 : nC >= 8---------------------
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//------------------------
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// nC > 8
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//------------------------
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always @(rbsp_4)
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always @(rbsp_4)
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begin
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begin
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len_4 <= 6;
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len_4 <= 6;
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if (rbsp_4[0:4] == 5'b00001) begin
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if (rbsp_4[0:4] == 5'b00001) begin
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TrailingOnes_4 <= 0;
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TrailingOnes_4 <= 0;
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if (nC == -1) begin
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if (nC == -1) begin
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TrailingOnes_comb <= TrailingOnes_5;
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TrailingOnes_comb <= TrailingOnes_5;
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TotalCoeff_comb <= TotalCoeff_5;
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TotalCoeff_comb <= TotalCoeff_5;
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len_comb <= len_5;
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len_comb <= len_5;
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end
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end
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else if (nC[3]) begin
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else if (nC[4] | nC[3]) begin
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TrailingOnes_comb <= TrailingOnes_4;
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TrailingOnes_comb <= TrailingOnes_4;
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TotalCoeff_comb <= TotalCoeff_4;
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TotalCoeff_comb <= TotalCoeff_4;
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len_comb <= len_4;
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len_comb <= len_4;
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end
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end
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else if (nC[2]) begin
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else if (nC[2]) begin
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TrailingOnes_comb <= TrailingOnes_1;
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TrailingOnes_comb <= TrailingOnes_1;
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TotalCoeff_comb <= TotalCoeff_1;
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TotalCoeff_comb <= TotalCoeff_1;
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len_comb <= len_1;
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len_comb <= len_1;
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end
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end
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end
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end
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//------------------------
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//------------------------
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//TrailingOnes & TotalCoeff
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//TrailingOnes & TotalCoeff
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//------------------------
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//------------------------
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wire output_refresh = ena && sel;
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always @(posedge clk or negedge rst_n)
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always @(posedge clk or negedge rst_n)
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if (~rst_n) begin
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if (!rst_n) begin
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TrailingOnes <= 0;
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TrailingOnes <= 0;
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TotalCoeff <= 0;
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TotalCoeff <= 0;
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end
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end
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else if (output_refresh) begin
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else if (ena && sel) begin
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TrailingOnes <= TrailingOnes_comb;
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TrailingOnes <= TrailingOnes_comb;
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TotalCoeff <= TotalCoeff_comb;
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TotalCoeff <= TotalCoeff_comb;
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end
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end
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endmodule
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endmodule
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