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qiubin |
//////////////////////////////////////////////////////////////////////
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//// ////
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//// cavlc_read_levels ////
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//// ////
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//// Description ////
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//// decode levels for coeffs ////
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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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6 |
qiubin |
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7 |
qiubin |
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//2011-8-6 initiial revision
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//2011-8-19 reverse the order of level
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6 |
qiubin |
// include TrailingOnes
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`include "defines.v"
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module cavlc_read_levels (
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qiubin |
clk,
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rst_n,
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ena,
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t1s_sel,
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prefix_sel,
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suffix_sel,
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calc_sel,
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TrailingOnes,
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TotalCoeff,
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rbsp,
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i,
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level_0,
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level_1,
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level_2,
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level_3,
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level_4,
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level_5,
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level_6,
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level_7,
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level_8,
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level_9,
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level_10,
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level_11,
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level_12,
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level_13,
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level_14,
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level_15,
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len_comb
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qiubin |
);
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//------------------------
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// ports
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//------------------------
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qiubin |
input clk;
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input rst_n;
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qiubin |
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qiubin |
input ena;
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input t1s_sel;
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input prefix_sel;
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input suffix_sel;
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input calc_sel;
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6 |
qiubin |
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7 |
qiubin |
input [1:0] TrailingOnes;
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input [4:0] TotalCoeff;
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input [0:15] rbsp;
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input [3:0] i;
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qiubin |
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qiubin |
output [8:0] level_0;
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output [8:0] level_1;
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output [8:0] level_2;
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output [8:0] level_3;
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output [8:0] level_4;
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output [8:0] level_5;
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output [8:0] level_6;
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output [8:0] level_7;
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output [8:0] level_8;
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output [8:0] level_9;
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output [8:0] level_10;
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output [8:0] level_11;
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output [8:0] level_12;
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output [8:0] level_13;
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output [8:0] level_14;
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output [8:0] level_15;
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qiubin |
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qiubin |
output [4:0] len_comb;
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qiubin |
//------------------------
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// regs
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//------------------------
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qiubin |
reg [0:15] rbsp_internal; // reduce toggle rate
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reg [3:0] level_prefix_comb;
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reg [8:0] level_suffix;
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reg [4:0] len_comb;
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6 |
qiubin |
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//------------------------
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// FFs
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//------------------------
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qiubin |
reg [3:0] level_prefix;
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reg [2:0] suffixLength; // range from 0 to 6
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reg [8:0] level;
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reg [8:0] level_abs;
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reg [8:0] level_code_tmp;
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reg [8:0] level_0, level_1, level_2, level_3, level_4, level_5, level_6, level_7;
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reg [8:0] level_8, level_9, level_10, level_11, level_12, level_13, level_14, level_15;
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6 |
qiubin |
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//------------------------
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// level_prefix_comb
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//------------------------
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qiubin |
always @(*)
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if ((t1s_sel || prefix_sel || suffix_sel)&& ena)
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rbsp_internal <= rbsp;
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else
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rbsp_internal <= 'hffff;
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qiubin |
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always @(*)
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qiubin |
if (rbsp_internal[0]) level_prefix_comb <= 0;
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else if (rbsp_internal[1]) level_prefix_comb <= 1;
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else if (rbsp_internal[2]) level_prefix_comb <= 2;
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else if (rbsp_internal[3]) level_prefix_comb <= 3;
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else if (rbsp_internal[4]) level_prefix_comb <= 4;
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else if (rbsp_internal[5]) level_prefix_comb <= 5;
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else if (rbsp_internal[6]) level_prefix_comb <= 6;
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else if (rbsp_internal[7]) level_prefix_comb <= 7;
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else if (rbsp_internal[8]) level_prefix_comb <= 8;
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else if (rbsp_internal[9]) level_prefix_comb <= 9;
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else if (rbsp_internal[10]) level_prefix_comb <= 10;
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else if (rbsp_internal[11]) level_prefix_comb <= 11;
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else if (rbsp_internal[12]) level_prefix_comb <= 12;
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else if (rbsp_internal[13]) level_prefix_comb <= 13;
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else if (rbsp_internal[14]) level_prefix_comb <= 14;
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else if (rbsp_internal[15]) level_prefix_comb <= 15;
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else level_prefix_comb <= 'bx;
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6 |
qiubin |
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//------------------------
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// level_prefix
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//------------------------
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always @(posedge clk or negedge rst_n)
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qiubin |
if (!rst_n)
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level_prefix <= 0;
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else if (prefix_sel && ena)
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level_prefix <= level_prefix_comb;
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6 |
qiubin |
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//------------------------
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// suffixLength
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//------------------------
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wire first_level;
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assign first_level = (i == TotalCoeff - TrailingOnes - 1);
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always @(posedge clk or negedge rst_n)
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qiubin |
if (!rst_n)
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suffixLength <= 0;
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else if (prefix_sel && ena) begin
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if (TotalCoeff > 10 && TrailingOnes < 3 && first_level ) //initialize suffixLength before proceeding first level_suffix
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suffixLength <= 1;
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else if (first_level)
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suffixLength <= 0;
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else if (suffixLength == 0 && level_abs > 2'd3)
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suffixLength <= 2;
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else if (suffixLength == 0)
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suffixLength <= 1;
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else if ( level_abs > (2'd3 << (suffixLength - 1'b1) ) && suffixLength < 6)
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suffixLength <= suffixLength + 1'b1;
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6 |
qiubin |
end
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//------------------------
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// level_suffix
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//------------------------
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always @(*)
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7 |
qiubin |
if (suffixLength > 0 && level_prefix <= 14)
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level_suffix <= {3'b0, rbsp_internal[0:5] >> (3'd6 - suffixLength)};
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else if (level_prefix == 14) //level_prefix == 14 && suffixLength == 0
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level_suffix <= {3'b0, rbsp_internal[0:3] };
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else if (level_prefix == 15)
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level_suffix <= rbsp_internal[3:11];
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else
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level_suffix <= 0;
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6 |
qiubin |
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| 205 |
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//------------------------
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| 206 |
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// level_code_tmp
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//------------------------
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always @(posedge clk or negedge rst_n)
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7 |
qiubin |
if (!rst_n) begin
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level_code_tmp <= 0;
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| 211 |
6 |
qiubin |
end
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| 212 |
7 |
qiubin |
else if (suffix_sel && ena) begin
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level_code_tmp <= (level_prefix << suffixLength) + level_suffix +
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((suffixLength == 0 && level_prefix == 15) ? 4'd15 : 0);
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6 |
qiubin |
end
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| 216 |
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| 217 |
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| 218 |
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//------------------------
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| 219 |
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// level
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| 220 |
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//------------------------
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| 221 |
7 |
qiubin |
wire [2:0] tmp1;
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| 222 |
6 |
qiubin |
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assign tmp1 = (first_level && TrailingOnes < 3)? 2'd2 : 2'd0;
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| 225 |
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always @(*)
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begin
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| 227 |
7 |
qiubin |
if (level_code_tmp % 2 == 0) begin
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| 228 |
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level <= ( level_code_tmp + tmp1 + 2 ) >> 1;
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end
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else begin
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level <= (-level_code_tmp - tmp1 - 1 ) >> 1;
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| 232 |
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end
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| 233 |
6 |
qiubin |
end
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| 234 |
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| 235 |
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//------------------------
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| 236 |
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// level_abs
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| 237 |
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//------------------------
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| 238 |
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wire level_abs_refresh;
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| 239 |
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assign level_abs_refresh = calc_sel && ena;
|
| 240 |
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| 241 |
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always @(posedge clk or negedge rst_n)
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| 242 |
7 |
qiubin |
if (!rst_n) begin
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| 243 |
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level_abs <= 0;
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| 244 |
6 |
qiubin |
end
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| 245 |
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else if (level_abs_refresh) begin
|
| 246 |
7 |
qiubin |
level_abs <= level[8] ? -level : level;
|
| 247 |
6 |
qiubin |
end
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| 248 |
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| 249 |
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//------------------------
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| 250 |
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// level regfile
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| 251 |
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//------------------------
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| 252 |
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always @ (posedge clk or negedge rst_n)
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| 253 |
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if (!rst_n) begin
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| 254 |
7 |
qiubin |
level_0 <= 0; level_1 <= 0; level_2 <= 0; level_3 <= 0;
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| 255 |
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level_4 <= 0; level_5 <= 0; level_6 <= 0; level_7 <= 0;
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| 256 |
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level_8 <= 0; level_9 <= 0; level_10<= 0; level_11<= 0;
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| 257 |
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level_12<= 0; level_13<= 0; level_14<= 0; level_15<= 0;
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| 258 |
6 |
qiubin |
end
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| 259 |
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else if (t1s_sel && ena)
|
| 260 |
7 |
qiubin |
case (i)
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| 261 |
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| 262 |
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1 : begin
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| 263 |
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level_1 <= rbsp_internal[0]? -1 : 1;
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| 264 |
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if (TrailingOnes[1])
|
| 265 |
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level_0 <= rbsp_internal[1]? -1 : 1;
|
| 266 |
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end
|
| 267 |
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2 : begin
|
| 268 |
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level_2 <= rbsp_internal[0]? -1 : 1;
|
| 269 |
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if (TrailingOnes[1])
|
| 270 |
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level_1 <= rbsp_internal[1]? -1 : 1;
|
| 271 |
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if (TrailingOnes == 3)
|
| 272 |
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level_0 <= rbsp_internal[2]? -1 : 1;
|
| 273 |
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end
|
| 274 |
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3 : begin
|
| 275 |
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level_3 <= rbsp_internal[0]? -1 : 1;
|
| 276 |
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if (TrailingOnes[1])
|
| 277 |
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level_2 <= rbsp_internal[1]? -1 : 1;
|
| 278 |
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if (TrailingOnes == 3)
|
| 279 |
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level_1 <= rbsp_internal[2]? -1 : 1;
|
| 280 |
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end
|
| 281 |
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4 : begin
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| 282 |
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level_4 <= rbsp_internal[0]? -1 : 1;
|
| 283 |
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if (TrailingOnes[1])
|
| 284 |
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level_3 <= rbsp_internal[1]? -1 : 1;
|
| 285 |
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if (TrailingOnes == 3)
|
| 286 |
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level_2 <= rbsp_internal[2]? -1 : 1;
|
| 287 |
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end
|
| 288 |
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5 : begin
|
| 289 |
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level_5 <= rbsp_internal[0]? -1 : 1;
|
| 290 |
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if (TrailingOnes[1])
|
| 291 |
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level_4 <= rbsp_internal[1]? -1 : 1;
|
| 292 |
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if (TrailingOnes == 3)
|
| 293 |
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level_3 <= rbsp_internal[2]? -1 : 1;
|
| 294 |
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end
|
| 295 |
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6 : begin
|
| 296 |
|
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level_6 <= rbsp_internal[0]? -1 : 1;
|
| 297 |
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if (TrailingOnes[1])
|
| 298 |
|
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level_5 <= rbsp_internal[1]? -1 : 1;
|
| 299 |
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if (TrailingOnes == 3)
|
| 300 |
|
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level_4 <= rbsp_internal[2]? -1 : 1;
|
| 301 |
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end
|
| 302 |
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7 : begin
|
| 303 |
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level_7 <= rbsp_internal[0]? -1 : 1;
|
| 304 |
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if (TrailingOnes[1])
|
| 305 |
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level_6 <= rbsp_internal[1]? -1 : 1;
|
| 306 |
|
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if (TrailingOnes == 3)
|
| 307 |
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level_5 <= rbsp_internal[2]? -1 : 1;
|
| 308 |
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end
|
| 309 |
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8 : begin
|
| 310 |
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level_8 <= rbsp_internal[0]? -1 : 1;
|
| 311 |
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if (TrailingOnes[1])
|
| 312 |
|
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level_7 <= rbsp_internal[1]? -1 : 1;
|
| 313 |
|
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if (TrailingOnes == 3)
|
| 314 |
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level_6 <= rbsp_internal[2]? -1 : 1;
|
| 315 |
|
|
end
|
| 316 |
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9 : begin
|
| 317 |
|
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level_9 <= rbsp_internal[0]? -1 : 1;
|
| 318 |
|
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if (TrailingOnes[1])
|
| 319 |
|
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level_8 <= rbsp_internal[1]? -1 : 1;
|
| 320 |
|
|
if (TrailingOnes == 3)
|
| 321 |
|
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level_7 <= rbsp_internal[2]? -1 : 1;
|
| 322 |
|
|
end
|
| 323 |
|
|
10: begin
|
| 324 |
|
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level_10 <= rbsp_internal[0]? -1 : 1;
|
| 325 |
|
|
if (TrailingOnes[1])
|
| 326 |
|
|
level_9 <= rbsp_internal[1]? -1 : 1;
|
| 327 |
|
|
if (TrailingOnes == 3)
|
| 328 |
|
|
level_8 <= rbsp_internal[2]? -1 : 1;
|
| 329 |
|
|
end
|
| 330 |
|
|
11: begin
|
| 331 |
|
|
level_11 <= rbsp_internal[0]? -1 : 1;
|
| 332 |
|
|
if (TrailingOnes[1])
|
| 333 |
|
|
level_10 <= rbsp_internal[1]? -1 : 1;
|
| 334 |
|
|
if (TrailingOnes == 3)
|
| 335 |
|
|
level_9 <= rbsp_internal[2]? -1 : 1;
|
| 336 |
|
|
end
|
| 337 |
|
|
12: begin
|
| 338 |
|
|
level_12 <= rbsp_internal[0]? -1 : 1;
|
| 339 |
|
|
if (TrailingOnes[1])
|
| 340 |
|
|
level_11 <= rbsp_internal[1]? -1 : 1;
|
| 341 |
|
|
if (TrailingOnes == 3)
|
| 342 |
|
|
level_10 <= rbsp_internal[2]? -1 : 1;
|
| 343 |
|
|
end
|
| 344 |
|
|
13: begin
|
| 345 |
|
|
level_13 <= rbsp_internal[0]? -1 : 1;
|
| 346 |
|
|
if (TrailingOnes[1])
|
| 347 |
|
|
level_12 <= rbsp_internal[1]? -1 : 1;
|
| 348 |
|
|
if (TrailingOnes == 3)
|
| 349 |
|
|
level_11 <= rbsp_internal[2]? -1 : 1;
|
| 350 |
|
|
end
|
| 351 |
|
|
14: begin
|
| 352 |
|
|
level_14 <= rbsp_internal[0]? -1 : 1;
|
| 353 |
|
|
if (TrailingOnes[1])
|
| 354 |
|
|
level_13 <= rbsp_internal[1]? -1 : 1;
|
| 355 |
|
|
if (TrailingOnes == 3)
|
| 356 |
|
|
level_12 <= rbsp_internal[2]? -1 : 1;
|
| 357 |
|
|
end
|
| 358 |
|
|
15: begin
|
| 359 |
|
|
level_15 <= rbsp_internal[0]? -1 : 1;
|
| 360 |
|
|
if (TrailingOnes[1])
|
| 361 |
|
|
level_14 <= rbsp_internal[1]? -1 : 1;
|
| 362 |
|
|
if (TrailingOnes == 3)
|
| 363 |
|
|
level_13 <= rbsp_internal[2]? -1 : 1;
|
| 364 |
|
|
end
|
| 365 |
6 |
qiubin |
endcase
|
| 366 |
|
|
else if (calc_sel && ena)
|
| 367 |
|
|
case (i)
|
| 368 |
7 |
qiubin |
|
| 369 |
|
|
1 :level_1 <= level;
|
| 370 |
|
|
2 :level_2 <= level;
|
| 371 |
|
|
3 :level_3 <= level;
|
| 372 |
|
|
4 :level_4 <= level;
|
| 373 |
|
|
5 :level_5 <= level;
|
| 374 |
|
|
6 :level_6 <= level;
|
| 375 |
|
|
7 :level_7 <= level;
|
| 376 |
|
|
8 :level_8 <= level;
|
| 377 |
|
|
9 :level_9 <= level;
|
| 378 |
|
|
10:level_10<= level;
|
| 379 |
|
|
11:level_11<= level;
|
| 380 |
|
|
12:level_12<= level;
|
| 381 |
|
|
13:level_13<= level;
|
| 382 |
|
|
14:level_14<= level;
|
| 383 |
|
|
15:level_15<= level;
|
| 384 |
6 |
qiubin |
endcase
|
| 385 |
|
|
|
| 386 |
|
|
always @(*)
|
| 387 |
|
|
if(t1s_sel)
|
| 388 |
7 |
qiubin |
len_comb <= TrailingOnes;
|
| 389 |
6 |
qiubin |
else if(prefix_sel)
|
| 390 |
7 |
qiubin |
len_comb <= level_prefix_comb + 1;
|
| 391 |
6 |
qiubin |
else if(suffix_sel && suffixLength > 0 && level_prefix <= 14)
|
| 392 |
7 |
qiubin |
len_comb <= suffixLength;
|
| 393 |
6 |
qiubin |
else if(suffix_sel && level_prefix == 14)
|
| 394 |
7 |
qiubin |
len_comb <= 4;
|
| 395 |
6 |
qiubin |
else if(suffix_sel && level_prefix == 15)
|
| 396 |
7 |
qiubin |
len_comb <= 12;
|
| 397 |
6 |
qiubin |
else
|
| 398 |
7 |
qiubin |
len_comb <= 0;
|
| 399 |
6 |
qiubin |
|
| 400 |
|
|
endmodule
|
