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SOFA/BENCHMARK/cavlc_top/rtl/cavlc_read_total_zeros.v

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//////////////////////////////////////////////////////////////////////
//// ////
//// cavlc_read_total_zeros ////
//// ////
//// Description ////
//// decode total_zeros ////
//// ////
//// Author(s): ////
//// - bin qiu, qiubin@opencores.org ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2011 Authors and OPENCORES.ORG ////
//// ////
//// This source file may be used and distributed without ////
//// restriction provided that this copyright statement is not ////
//// removed from the file and that any derivative work contains ////
//// the original copyright notice and the associated disclaimer. ////
//// ////
//// This source file is free software; you can redistribute it ////
//// and/or modify it under the terms of the GNU Lesser General ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any ////
//// later version. ////
//// ////
//// This source is distributed in the hope that it will be ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
//// PURPOSE. See the GNU Lesser General Public License for more ////
//// details. ////
//// ////
//// You should have received a copy of the GNU Lesser General ////
//// Public License along with this source; if not, download it ////
//// from http://www.opencores.org/lgpl.shtml ////
//// ////
//////////////////////////////////////////////////////////////////////
//2011-8-14 initial version
`include "defines.v"
module cavlc_read_total_zeros
(
ena,
sel,
chroma_DC_sel,
rbsp,
TotalCoeff,
TotalZeros_comb,
len_comb
);
//------------------------
//ports
//------------------------
input ena;
input sel;
input chroma_DC_sel;
input [0:8] rbsp;
input [3:0] TotalCoeff;
output [3:0] TotalZeros_comb;
output [3:0] len_comb;
//-------------------------
//rregs
//-------------------------
reg [3:0] TotalZeros_comb; //TotalZeros will be saved as ZeroLeft in module cavlc_read_run_befores
reg [3:0] len_comb;
//for chroma_DC
reg [0:2] rbsp_chroma_DC;
reg [1:0] TotalZeros_chroma_DC;
reg [1:0] len_chroma_DC;
//for TotalCoeff <= 3
reg [0:8] rbsp_LE3;
reg [3:0] TotalZeros_LE3;
reg [3:0] len_LE3;
//for TotalCoeff > 3
reg [0:5] rbsp_G3;
reg [3:0] TotalZeros_G3;
reg [2:0] len_G3;
//----------------------------------------
//input mux
//----------------------------------------
always @(*)
if (ena && sel && chroma_DC_sel) begin
rbsp_chroma_DC <= rbsp[0:2];
rbsp_LE3 <= 'hffff;
rbsp_G3 <= 'hffff;
end
else if (ena && sel && TotalCoeff[3:2] == 2'b00) begin
rbsp_chroma_DC <= 'hffff;
rbsp_LE3 <= rbsp[0:8];
rbsp_G3 <= 'hffff;
end
else if (ena && sel)begin
rbsp_chroma_DC <= 'hffff;
rbsp_LE3 <= 'hffff;
rbsp_G3 <= rbsp[0:5];
end
else begin
rbsp_chroma_DC <= 'hffff;
rbsp_LE3 <= 'hffff;
rbsp_G3 <= 'hffff;
end
//----------------------------------------
//TotalZeros_chroma_DC & len_chroma_DC
//----------------------------------------
always @(*)
if ( TotalCoeff == 1 && rbsp_chroma_DC[0] ) begin
TotalZeros_chroma_DC <= 0;
len_chroma_DC <= 1;
end
else if ( TotalCoeff == 1 && rbsp_chroma_DC[1] ) begin
TotalZeros_chroma_DC <= 1;
len_chroma_DC <= 2;
end
else if ( TotalCoeff == 1 && rbsp_chroma_DC[2] ) begin
TotalZeros_chroma_DC <= 2;
len_chroma_DC <= 3;
end
else if ( TotalCoeff == 1 ) begin
TotalZeros_chroma_DC <= 3;
len_chroma_DC <= 3;
end
else if ( TotalCoeff == 2 && rbsp_chroma_DC[0] ) begin
TotalZeros_chroma_DC <= 0;
len_chroma_DC <= 1;
end
else if ( TotalCoeff == 2 && rbsp_chroma_DC[1] ) begin
TotalZeros_chroma_DC <= 1;
len_chroma_DC <= 2;
end
else if ( TotalCoeff == 2 ) begin
TotalZeros_chroma_DC <= 2;
len_chroma_DC <= 2;
end
else if ( rbsp_chroma_DC[0] ) begin
TotalZeros_chroma_DC <= 0;
len_chroma_DC <= 1;
end
else begin
TotalZeros_chroma_DC <= 1;
len_chroma_DC <= 1;
end
//---------------------------------
//TotalZeros_LE3 & len_LE3
//---------------------------------
always @(rbsp_LE3 or TotalCoeff)
case (TotalCoeff[1:0])
1 :begin
case(1'b1)
rbsp_LE3[0] : begin
TotalZeros_LE3 <= 0;
len_LE3 <= 1;
end
rbsp_LE3[1] : begin
len_LE3 <= 3;
if (rbsp_LE3[2])
TotalZeros_LE3 <= 1;
else
TotalZeros_LE3 <= 2;
end
rbsp_LE3[2] : begin
len_LE3 <= 4;
if (rbsp_LE3[3])
TotalZeros_LE3 <= 3;
else
TotalZeros_LE3 <= 4;
end
rbsp_LE3[3] : begin
len_LE3 <= 5;
if (rbsp_LE3[4])
TotalZeros_LE3 <= 5;
else
TotalZeros_LE3 <= 6;
end
rbsp_LE3[4] : begin
len_LE3 <= 6;
if (rbsp_LE3[5])
TotalZeros_LE3 <= 7;
else
TotalZeros_LE3 <= 8;
end
rbsp_LE3[5] : begin
len_LE3 <= 7;
if (rbsp_LE3[6])
TotalZeros_LE3 <= 9;
else
TotalZeros_LE3 <= 10;
end
rbsp_LE3[6] : begin
len_LE3 <= 8;
if (rbsp_LE3[7])
TotalZeros_LE3 <= 11;
else
TotalZeros_LE3 <= 12;
end
rbsp_LE3[7] : begin
len_LE3 <= 9;
if (rbsp_LE3[8])
TotalZeros_LE3 <= 13;
else
TotalZeros_LE3 <= 14;
end
default : begin
len_LE3 <= 9;
TotalZeros_LE3 <= 15;
end
endcase
end
2 : begin
case(1'b1)
rbsp_LE3[0] : begin
len_LE3 <= 3;
case(rbsp_LE3[1:2])
'b11 : TotalZeros_LE3 <= 0;
'b10 : TotalZeros_LE3 <= 1;
'b01 : TotalZeros_LE3 <= 2;
'b00 : TotalZeros_LE3 <= 3;
endcase
end
rbsp_LE3[1] : begin
if (rbsp_LE3[2]) begin
TotalZeros_LE3 <= 4;
len_LE3 <= 3;
end
else begin
len_LE3 <= 4;
if (rbsp_LE3[3])
TotalZeros_LE3 <= 5;
else
TotalZeros_LE3 <= 6;
end
end
rbsp_LE3[2] : begin
len_LE3 <= 4;
if (rbsp_LE3[3])
TotalZeros_LE3 <= 7;
else
TotalZeros_LE3 <= 8;
end
rbsp_LE3[3] : begin
len_LE3 <= 5;
if (rbsp_LE3[4])
TotalZeros_LE3 <= 9;
else
TotalZeros_LE3 <= 10;
end
default : begin
len_LE3 <= 6;
case(rbsp_LE3[4:5])
'b11 : TotalZeros_LE3 <= 11;
'b10 : TotalZeros_LE3 <= 12;
'b01 : TotalZeros_LE3 <= 13;
'b00 : TotalZeros_LE3 <= 14;
endcase
end
endcase
end
3 : begin
case(1'b1)
rbsp_LE3[0] : begin
len_LE3 <= 3;
case(rbsp_LE3[1:2])
'b11 : TotalZeros_LE3 <= 1;
'b10 : TotalZeros_LE3 <= 2;
'b01 : TotalZeros_LE3 <= 3;
'b00 : TotalZeros_LE3 <= 6;
endcase
end
rbsp_LE3[1] : begin
if (rbsp_LE3[2]) begin
TotalZeros_LE3 <= 7;
len_LE3 <= 3;
end
else begin
len_LE3 <= 4;
if (rbsp_LE3[3])
TotalZeros_LE3 <= 0;
else
TotalZeros_LE3 <= 4;
end
end
rbsp_LE3[2] : begin
len_LE3 <= 4;
if (rbsp_LE3[3])
TotalZeros_LE3 <= 5;
else
TotalZeros_LE3 <= 8;
end
rbsp_LE3[3] : begin
len_LE3 <= 5;
if (rbsp_LE3[4])
TotalZeros_LE3 <= 9;
else
TotalZeros_LE3 <= 10;
end
rbsp_LE3[4] : begin
len_LE3 <= 5;
TotalZeros_LE3 <= 12;
end
default : begin
len_LE3 <= 6;
if(rbsp_LE3[5])
TotalZeros_LE3 <= 11;
else
TotalZeros_LE3 <= 13;
end
endcase
end
default : begin
len_LE3 <= 'bx;
TotalZeros_LE3 <= 'bx;
end
endcase
//---------------------------------
//TotalZeros_G3 & len_G3
//---------------------------------
always @(rbsp_G3 or TotalCoeff)
case (TotalCoeff)
4 : begin
case(1'b1)
rbsp_G3[0] : begin
len_G3 <= 3;
case(rbsp_G3[1:2])
'b11 : TotalZeros_G3 <= 1;
'b10 : TotalZeros_G3 <= 4;
'b01 : TotalZeros_G3 <= 5;
'b00 : TotalZeros_G3 <= 6;
endcase
end
rbsp_G3[1] : begin
if (rbsp_G3[2]) begin
TotalZeros_G3 <= 8;
len_G3 <= 3;
end
else begin
len_G3 <= 4;
if (rbsp_G3[3])
TotalZeros_G3 <= 2;
else
TotalZeros_G3 <= 3;
end
end
rbsp_G3[2] : begin
len_G3 <= 4;
if (rbsp_G3[3])
TotalZeros_G3 <= 7;
else
TotalZeros_G3 <= 9;
end
default : begin
len_G3 <= 5;
case(rbsp_G3[3:4])
'b11 : TotalZeros_G3 <= 0;
'b10 : TotalZeros_G3 <= 10;
'b01 : TotalZeros_G3 <= 11;
'b00 : TotalZeros_G3 <= 12;
endcase
end
endcase
end
5 :begin
case(1'b1)
rbsp_G3[0] : begin
len_G3 <= 3;
case(rbsp_G3[1:2])
'b11 : TotalZeros_G3 <= 3;
'b10 : TotalZeros_G3 <= 4;
'b01 : TotalZeros_G3 <= 5;
'b00 : TotalZeros_G3 <= 6;
endcase
end
rbsp_G3[1] : begin
if (rbsp_G3[2]) begin
TotalZeros_G3 <= 7;
len_G3 <= 3;
end
else begin
len_G3 <= 4;
if (rbsp_G3[3])
TotalZeros_G3 <= 0;
else
TotalZeros_G3 <= 1;
end
end
rbsp_G3[2] : begin
len_G3 <= 4;
if (rbsp_G3[3])
TotalZeros_G3 <= 2;
else
TotalZeros_G3 <= 8;
end
rbsp_G3[3] : begin
len_G3 <= 4;
TotalZeros_G3 <= 10;
end
default : begin
len_G3 <= 5;
if (rbsp_G3[4])
TotalZeros_G3 <= 9;
else
TotalZeros_G3 <= 11;
end
endcase
end
6 : begin
case(1'b1)
rbsp_G3[0] : begin
len_G3 <= 3;
case(rbsp_G3[1:2])
'b11 : TotalZeros_G3 <= 2;
'b10 : TotalZeros_G3 <= 3;
'b01 : TotalZeros_G3 <= 4;
'b00 : TotalZeros_G3 <= 5;
endcase
end
rbsp_G3[1] : begin
len_G3 <= 3;
if (rbsp_G3[2])
TotalZeros_G3 <= 6;
else
TotalZeros_G3 <= 7;
end
rbsp_G3[2] : begin
len_G3 <= 3;
TotalZeros_G3 <= 9;
end
rbsp_G3[3] : begin
len_G3 <= 4;
TotalZeros_G3 <= 8;
end
rbsp_G3[4] : begin
len_G3 <= 5;
TotalZeros_G3 <= 1;
end
default : begin
len_G3 <= 6;
if (rbsp_G3[5])
TotalZeros_G3 <= 0;
else
TotalZeros_G3 <= 10;
end
endcase
end
7 :begin
case(1'b1)
rbsp_G3[0] : begin
if (rbsp_G3[1]) begin
TotalZeros_G3 <= 5;
len_G3 <= 2;
end
else begin
len_G3 <= 3;
if (rbsp_G3[2])
TotalZeros_G3 <= 2;
else
TotalZeros_G3 <= 3;
end
end
rbsp_G3[1] : begin
len_G3 <= 3;
if (rbsp_G3[2])
TotalZeros_G3 <= 4;
else
TotalZeros_G3 <= 6;
end
rbsp_G3[2] : begin
len_G3 <= 3;
TotalZeros_G3 <= 8;
end
rbsp_G3[3] : begin
len_G3 <= 4;
TotalZeros_G3 <= 7;
end
rbsp_G3[4] : begin
len_G3 <= 5;
TotalZeros_G3 <= 1;
end
default : begin
len_G3 <= 6;
if (rbsp_G3[5])
TotalZeros_G3 <= 0;
else
TotalZeros_G3 <= 9;
end
endcase
end
8 :begin
case(1'b1)
rbsp_G3[0] : begin
len_G3 <= 2;
if (rbsp_G3[1])
TotalZeros_G3 <= 4;
else
TotalZeros_G3 <= 5;
end
rbsp_G3[1] : begin
len_G3 <= 3;
if (rbsp_G3[2])
TotalZeros_G3 <= 3;
else
TotalZeros_G3 <= 6;
end
rbsp_G3[2] : begin
len_G3 <= 3;
TotalZeros_G3 <= 7;
end
rbsp_G3[3] : begin
len_G3 <= 4;
TotalZeros_G3 <= 1;
end
rbsp_G3[4] : begin
len_G3 <= 5;
TotalZeros_G3 <= 2;
end
default : begin
len_G3 <= 6;
if (rbsp_G3[5])
TotalZeros_G3 <= 0;
else
TotalZeros_G3 <= 8;
end
endcase
end
9 : begin
case(1'b1)
rbsp_G3[0] : begin
len_G3 <= 2;
if (rbsp_G3[1])
TotalZeros_G3 <= 3;
else
TotalZeros_G3 <= 4;
end
rbsp_G3[1] : begin
len_G3 <= 2;
TotalZeros_G3 <= 6;
end
rbsp_G3[2] : begin
len_G3 <= 3;
TotalZeros_G3 <= 5;
end
rbsp_G3[3] : begin
len_G3 <= 4;
TotalZeros_G3 <= 2;
end
rbsp_G3[4] : begin
len_G3 <= 5;
TotalZeros_G3 <= 7;
end
default : begin
len_G3 <= 6;
if (rbsp_G3[5])
TotalZeros_G3 <= 0;
else
TotalZeros_G3 <= 1;
end
endcase
end
10 : begin
case(1'b1)
rbsp_G3[0] : begin
len_G3 <= 2;
if (rbsp_G3[1])
TotalZeros_G3 <= 3;
else
TotalZeros_G3 <= 4;
end
rbsp_G3[1] : begin
len_G3 <= 2;
TotalZeros_G3 <= 5;
end
rbsp_G3[2] : begin
len_G3 <= 3;
TotalZeros_G3 <= 2;
end
rbsp_G3[3] : begin
len_G3 <= 4;
TotalZeros_G3 <= 6;
end
default : begin
len_G3 <= 5;
if (rbsp_G3[4])
TotalZeros_G3 <= 0;
else
TotalZeros_G3 <= 1;
end
endcase
end
11 : begin
case(1'b1)
rbsp_G3[0] : begin
len_G3 <= 1;
TotalZeros_G3 <= 4;
end
rbsp_G3[1] : begin
len_G3 <= 3;
if (rbsp_G3[2])
TotalZeros_G3 <= 5;
else
TotalZeros_G3 <= 3;
end
rbsp_G3[2] : begin
len_G3 <= 3;
TotalZeros_G3 <= 2;
end
default : begin
len_G3 <= 4;
if (rbsp_G3[3])
TotalZeros_G3 <= 1;
else
TotalZeros_G3 <= 0;
end
endcase
end
12 : begin
case(1'b1)
rbsp_G3[0] : begin
len_G3 <= 1;
TotalZeros_G3 <= 3;
end
rbsp_G3[1] : begin
len_G3 <= 2;
TotalZeros_G3 <= 2;
end
rbsp_G3[2] : begin
len_G3 <= 3;
TotalZeros_G3 <= 4;
end
default : begin
len_G3 <= 4;
if (rbsp_G3[3])
TotalZeros_G3 <= 1;
else
TotalZeros_G3 <= 0;
end
endcase
end
13 :begin
if (rbsp_G3[0]) begin
TotalZeros_G3 <= 2;
len_G3 <= 1;
end
else if (rbsp_G3[1]) begin
TotalZeros_G3 <= 3;
len_G3 <= 2;
end
else if (rbsp_G3[2]) begin
TotalZeros_G3 <= 1;
len_G3 <= 3;
end
else begin
TotalZeros_G3 <= 0;
len_G3 <= 3;
end
end
14 : begin
if (rbsp_G3[0]) begin
TotalZeros_G3 <= 2;
len_G3 <= 1;
end
else if (rbsp_G3[1]) begin
TotalZeros_G3 <= 1;
len_G3 <= 2;
end
else begin
TotalZeros_G3 <= 0;
len_G3 <= 2;
end
end
15 : begin
len_G3 <= 1;
if (rbsp_G3[0])
TotalZeros_G3 <= 1;
else
TotalZeros_G3 <= 0;
end
default : begin
len_G3 <= 'bx;
TotalZeros_G3 <= 'bx;
end
endcase
//---------------------------------
//TotalZeros_comb & len_comb
//---------------------------------
always @(*)
if (ena && sel && chroma_DC_sel) begin
TotalZeros_comb <= TotalZeros_chroma_DC;
len_comb <= len_chroma_DC;
end
else if (ena && sel && TotalCoeff[3:2] == 2'b00) begin
TotalZeros_comb <= TotalZeros_LE3;
len_comb <= len_LE3;
end
else if (ena && sel)begin
TotalZeros_comb <= TotalZeros_G3;
len_comb <= len_G3;
end
else begin
TotalZeros_comb <= 0;
len_comb <= 0;
end
endmodule
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