| Line 1... |
Line 1... |
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//////////////////////////////////////////////////////////////////////
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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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//2011-8-6 initiial revision
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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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//2011-8-19 reverse the order of level
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// include TrailingOnes
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// include TrailingOnes
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| Line 15... |
Line 53... |
calc_sel,
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calc_sel,
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TrailingOnes,
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TrailingOnes,
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TotalCoeff,
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TotalCoeff,
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rbsp,
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rbsp,
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i,
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i,
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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_0,
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level_8, level_9, level_10, level_11, level_12, level_13, level_14, level_15,
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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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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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| Line 36... |
Line 88... |
input [1:0] TrailingOnes;
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input [1:0] TrailingOnes;
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input [4:0] TotalCoeff;
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input [4:0] TotalCoeff;
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input [0:15] rbsp;
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input [0:15] rbsp;
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input [3:0] i;
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input [3:0] i;
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output [8:0] level_0, level_1, level_2, level_3, level_4, level_5, level_6, level_7;
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output [8:0] level_0;
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output [8:0] level_8, level_9, level_10, level_11, level_12, level_13, level_14, level_15;
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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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output [4:0] len_comb;
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output [4:0] len_comb;
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//------------------------
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//------------------------
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// regs
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// regs
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//------------------------
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//------------------------
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reg [0:15] rbsp_prefix; //for level_prefix_comb
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reg [0:15] rbsp_internal; // reduce toggle rate
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reg [3:0] level_prefix_comb;
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reg [3:0] level_prefix_comb;
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reg [8:0] level_suffix;
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reg [8:0] level_suffix;
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reg [4:0] len_comb;
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reg [4:0] len_comb;
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//------------------------
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//------------------------
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| Line 62... |
Line 129... |
reg [8:0] level_8, level_9, level_10, level_11, level_12, level_13, level_14, level_15;
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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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//------------------------
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//------------------------
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// level_prefix_comb
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// level_prefix_comb
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//------------------------
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//------------------------
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wire level_prefix_refresh;
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always @(*)
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assign level_prefix_refresh = (prefix_sel && ena);
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if ((t1s_sel || prefix_sel || suffix_sel)&& ena)
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rbsp_internal <= rbsp;
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always @(level_prefix_refresh or rbsp)
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if (level_prefix_refresh)
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rbsp_prefix <= rbsp;
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else
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else
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rbsp_prefix <= 'hffff;
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rbsp_internal <= 'hffff;
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always @(*)
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always @(*)
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if (rbsp_prefix[0]) level_prefix_comb <= 0;
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if (rbsp_internal[0]) level_prefix_comb <= 0;
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else if (rbsp_prefix[1]) level_prefix_comb <= 1;
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else if (rbsp_internal[1]) level_prefix_comb <= 1;
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else if (rbsp_prefix[2]) level_prefix_comb <= 2;
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else if (rbsp_internal[2]) level_prefix_comb <= 2;
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else if (rbsp_prefix[3]) level_prefix_comb <= 3;
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else if (rbsp_internal[3]) level_prefix_comb <= 3;
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else if (rbsp_prefix[4]) level_prefix_comb <= 4;
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else if (rbsp_internal[4]) level_prefix_comb <= 4;
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else if (rbsp_prefix[5]) level_prefix_comb <= 5;
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else if (rbsp_internal[5]) level_prefix_comb <= 5;
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else if (rbsp_prefix[6]) level_prefix_comb <= 6;
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else if (rbsp_internal[6]) level_prefix_comb <= 6;
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else if (rbsp_prefix[7]) level_prefix_comb <= 7;
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else if (rbsp_internal[7]) level_prefix_comb <= 7;
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else if (rbsp_prefix[8]) level_prefix_comb <= 8;
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else if (rbsp_internal[8]) level_prefix_comb <= 8;
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else if (rbsp_prefix[9]) level_prefix_comb <= 9;
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else if (rbsp_internal[9]) level_prefix_comb <= 9;
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else if (rbsp_prefix[10]) level_prefix_comb <= 10;
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else if (rbsp_internal[10]) level_prefix_comb <= 10;
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else if (rbsp_prefix[11]) level_prefix_comb <= 11;
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else if (rbsp_internal[11]) level_prefix_comb <= 11;
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else if (rbsp_prefix[12]) level_prefix_comb <= 12;
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else if (rbsp_internal[12]) level_prefix_comb <= 12;
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else if (rbsp_prefix[13]) level_prefix_comb <= 13;
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else if (rbsp_internal[13]) level_prefix_comb <= 13;
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else if (rbsp_prefix[14]) level_prefix_comb <= 14;
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else if (rbsp_internal[14]) level_prefix_comb <= 14;
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else if (rbsp_prefix[15]) level_prefix_comb <= 15;
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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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else level_prefix_comb <= 'bx;
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//------------------------
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//------------------------
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// level_prefix
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// level_prefix
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//------------------------
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//------------------------
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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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level_prefix <= 0;
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level_prefix <= 0;
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else if (level_prefix_refresh) begin
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else if (prefix_sel && ena)
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level_prefix <= level_prefix_comb;
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level_prefix <= level_prefix_comb;
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end
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//------------------------
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//------------------------
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// suffixLength
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// suffixLength
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//------------------------
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//------------------------
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wire first_level;
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wire first_level;
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assign first_level = (i == TotalCoeff - TrailingOnes - 1);
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assign first_level = (i == TotalCoeff - TrailingOnes - 1);
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wire suffixLength_refresh;
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assign suffixLength_refresh = prefix_sel && ena;
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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)
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suffixLength <= 0;
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suffixLength <= 0;
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end
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else if (prefix_sel && ena) begin
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else if (suffixLength_refresh) begin
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if (TotalCoeff > 10 && TrailingOnes < 3 && first_level ) //initialize suffixLength before proceeding first level_suffix
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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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suffixLength <= 1;
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else if (first_level)
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else if (first_level)
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suffixLength <= 0;
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suffixLength <= 0;
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else if (suffixLength == 0 && level_abs > 2'd3)
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else if (suffixLength == 0 && level_abs > 2'd3)
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| Line 131... |
Line 190... |
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//------------------------
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//------------------------
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// level_suffix
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// level_suffix
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//------------------------
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//------------------------
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wire level_suffix_refresh;
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assign level_suffix_refresh = suffix_sel && ena;
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always @(*)
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always @(*)
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if (level_suffix_refresh) begin
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if (suffixLength > 0 && level_prefix <= 14)
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if (suffixLength > 0 && level_prefix <= 14) begin
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level_suffix <= {3'b0, rbsp_internal[0:5] >> (3'd6 - suffixLength)};
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level_suffix <= {3'b0, rbsp[0:5] >> (3'd6 - suffixLength)};
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else if (level_prefix == 14) //level_prefix == 14 && suffixLength == 0
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end
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level_suffix <= {3'b0, rbsp_internal[0:3] };
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else if (level_prefix == 14) begin //level_prefix == 14 && suffixLength == 0
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else if (level_prefix == 15)
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level_suffix <= {3'b0, rbsp[0:3] };
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level_suffix <= rbsp_internal[3:11];
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end
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else
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else if (level_prefix == 15) begin
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level_suffix <= rbsp[3:11];
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end
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else begin
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level_suffix <= 0;
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end
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end
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else begin
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level_suffix <= 0;
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level_suffix <= 0;
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end
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//------------------------
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//------------------------
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// level_code_tmp
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// level_code_tmp
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//------------------------
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//------------------------
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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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level_code_tmp <= 0;
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level_code_tmp <= 0;
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end
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end
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else if (level_suffix_refresh) begin
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else if (suffix_sel && ena) begin
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level_code_tmp <= (level_prefix << suffixLength) + level_suffix +
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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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((suffixLength == 0 && level_prefix == 15) ? 4'd15 : 0);
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end
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end
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| Line 190... |
Line 237... |
//------------------------
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//------------------------
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wire level_abs_refresh;
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wire level_abs_refresh;
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assign level_abs_refresh = calc_sel && ena;
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assign level_abs_refresh = calc_sel && ena;
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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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level_abs <= 0;
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level_abs <= 0;
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end
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end
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else if (level_abs_refresh) begin
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else if (level_abs_refresh) begin
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level_abs <= level[8] ? -level : level;
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level_abs <= level[8] ? -level : level;
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end
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end
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| Line 209... |
Line 256... |
level_8 <= 0; level_9 <= 0; level_10<= 0; level_11<= 0;
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level_8 <= 0; level_9 <= 0; level_10<= 0; level_11<= 0;
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level_12<= 0; level_13<= 0; level_14<= 0; level_15<= 0;
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level_12<= 0; level_13<= 0; level_14<= 0; level_15<= 0;
|
end
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end
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else if (t1s_sel && ena)
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else if (t1s_sel && ena)
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case (i)
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case (i)
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0 : level_0 <= rbsp[0]? -1 : 1;
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0 : level_0 <= rbsp_internal[0]? -1 : 1;
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1 : begin
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1 : begin
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level_1 <= rbsp[0]? -1 : 1;
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level_1 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_0 <= rbsp[1]? -1 : 1;
|
level_0 <= rbsp_internal[1]? -1 : 1;
|
end
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end
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2 : begin
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2 : begin
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level_2 <= rbsp[0]? -1 : 1;
|
level_2 <= rbsp_internal[0]? -1 : 1;
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if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_1 <= rbsp[1]? -1 : 1;
|
level_1 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_0 <= rbsp[2]? -1 : 1;
|
level_0 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
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3 : begin
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3 : begin
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level_3 <= rbsp[0]? -1 : 1;
|
level_3 <= rbsp_internal[0]? -1 : 1;
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if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_2 <= rbsp[1]? -1 : 1;
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level_2 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_1 <= rbsp[2]? -1 : 1;
|
level_1 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
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4 : begin
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4 : begin
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level_4 <= rbsp[0]? -1 : 1;
|
level_4 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_3 <= rbsp[1]? -1 : 1;
|
level_3 <= rbsp_internal[1]? -1 : 1;
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if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_2 <= rbsp[2]? -1 : 1;
|
level_2 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
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5 : begin
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5 : begin
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level_5 <= rbsp[0]? -1 : 1;
|
level_5 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_4 <= rbsp[1]? -1 : 1;
|
level_4 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_3 <= rbsp[2]? -1 : 1;
|
level_3 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
6 : begin
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6 : begin
|
level_6 <= rbsp[0]? -1 : 1;
|
level_6 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_5 <= rbsp[1]? -1 : 1;
|
level_5 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_4 <= rbsp[2]? -1 : 1;
|
level_4 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
7 : begin
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7 : begin
|
level_7 <= rbsp[0]? -1 : 1;
|
level_7 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_6 <= rbsp[1]? -1 : 1;
|
level_6 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_5 <= rbsp[2]? -1 : 1;
|
level_5 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
8 : begin
|
8 : begin
|
level_8 <= rbsp[0]? -1 : 1;
|
level_8 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_7 <= rbsp[1]? -1 : 1;
|
level_7 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_6 <= rbsp[2]? -1 : 1;
|
level_6 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
9 : begin
|
9 : begin
|
level_9 <= rbsp[0]? -1 : 1;
|
level_9 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_8 <= rbsp[1]? -1 : 1;
|
level_8 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_7 <= rbsp[2]? -1 : 1;
|
level_7 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
10: begin
|
10: begin
|
level_10 <= rbsp[0]? -1 : 1;
|
level_10 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_9 <= rbsp[1]? -1 : 1;
|
level_9 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_8 <= rbsp[2]? -1 : 1;
|
level_8 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
11: begin
|
11: begin
|
level_11 <= rbsp[0]? -1 : 1;
|
level_11 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_10 <= rbsp[1]? -1 : 1;
|
level_10 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_9 <= rbsp[2]? -1 : 1;
|
level_9 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
12: begin
|
12: begin
|
level_12 <= rbsp[0]? -1 : 1;
|
level_12 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_11 <= rbsp[1]? -1 : 1;
|
level_11 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_10 <= rbsp[2]? -1 : 1;
|
level_10 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
13: begin
|
13: begin
|
level_13 <= rbsp[0]? -1 : 1;
|
level_13 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_12 <= rbsp[1]? -1 : 1;
|
level_12 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_11 <= rbsp[2]? -1 : 1;
|
level_11 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
14: begin
|
14: begin
|
level_14 <= rbsp[0]? -1 : 1;
|
level_14 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_13 <= rbsp[1]? -1 : 1;
|
level_13 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_12 <= rbsp[2]? -1 : 1;
|
level_12 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
15: begin
|
15: begin
|
level_15 <= rbsp[0]? -1 : 1;
|
level_15 <= rbsp_internal[0]? -1 : 1;
|
if (TrailingOnes[1])
|
if (TrailingOnes[1])
|
level_14 <= rbsp[1]? -1 : 1;
|
level_14 <= rbsp_internal[1]? -1 : 1;
|
if (TrailingOnes == 3)
|
if (TrailingOnes == 3)
|
level_13 <= rbsp[2]? -1 : 1;
|
level_13 <= rbsp_internal[2]? -1 : 1;
|
end
|
end
|
endcase
|
endcase
|
else if (calc_sel && ena)
|
else if (calc_sel && ena)
|
case (i)
|
case (i)
|
0 :level_0 <= level;
|
0 :level_0 <= level;
|
