|
//////////////////////////////////////////////////////////////////////
|
|
//// ////
|
|
//// cavlc_read_run_befores ////
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|
//// ////
|
|
//// Description ////
|
|
//// decode runs and combine them with levels ////
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//// ////
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//// Author(s): ////
|
|
//// - bin qiu, qiubin@opencores.org ////
|
|
//// ////
|
|
//////////////////////////////////////////////////////////////////////
|
|
//// ////
|
|
//// Copyright (C) 2011 Authors and OPENCORES.ORG ////
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|
//// ////
|
|
//// 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 ////
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//// and/or modify it under the terms of the GNU Lesser General ////
|
|
//// 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 ////
|
|
//// 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 ////
|
|
//// ////
|
|
//////////////////////////////////////////////////////////////////////
|
|
|
//2011-8-16 initiial revision
|
//2011-8-16 initiial revision
|
|
|
`include "defines.v"
|
`include "defines.v"
|
|
|
module cavlc_read_run_befores(
|
module cavlc_read_run_befores
|
|
(
|
clk,
|
clk,
|
rst_n,
|
rst_n,
|
ena,
|
ena,
|
sel,
|
sel,
|
clr,
|
clr,
|
ZeroLeft_init,
|
ZeroLeft_init,
|
|
|
rbsp,
|
rbsp,
|
i,
|
i,
|
TotalZeros_comb,
|
TotalZeros_comb,
|
|
|
level_0,
|
level_0,
|
level_1,
|
level_1,
|
level_2,
|
level_2,
|
level_3,
|
level_3,
|
level_4,
|
level_4,
|
level_5,
|
level_5,
|
level_6,
|
level_6,
|
level_7,
|
level_7,
|
level_8,
|
level_8,
|
level_9,
|
level_9,
|
level_10,
|
level_10,
|
level_11,
|
level_11,
|
level_12,
|
level_12,
|
level_13,
|
level_13,
|
level_14,
|
level_14,
|
level_15,
|
level_15,
|
|
|
coeff_0,
|
coeff_0,
|
coeff_1,
|
coeff_1,
|
coeff_2,
|
coeff_2,
|
coeff_3,
|
coeff_3,
|
coeff_4,
|
coeff_4,
|
coeff_5,
|
coeff_5,
|
coeff_6,
|
coeff_6,
|
coeff_7,
|
coeff_7,
|
coeff_8,
|
coeff_8,
|
coeff_9,
|
coeff_9,
|
coeff_10,
|
coeff_10,
|
coeff_11,
|
coeff_11,
|
coeff_12,
|
coeff_12,
|
coeff_13,
|
coeff_13,
|
coeff_14,
|
coeff_14,
|
coeff_15,
|
coeff_15,
|
ZeroLeft,
|
ZeroLeft,
|
len_comb
|
len_comb
|
);
|
);
|
//----------------------
|
//----------------------
|
//ports
|
//ports
|
//----------------------
|
//----------------------
|
input clk;
|
input clk;
|
input rst_n;
|
input rst_n;
|
input ena;
|
input ena;
|
input sel;
|
input sel;
|
input clr;
|
input clr;
|
input ZeroLeft_init;
|
input ZeroLeft_init;
|
|
|
input [0:10] rbsp;
|
input [0:10] rbsp;
|
input [3:0] i; //range from TotalCoeff-1 to 0
|
input [3:0] i; //range from TotalCoeff-1 to 0
|
input [3:0] TotalZeros_comb;
|
input [3:0] TotalZeros_comb;
|
|
|
input [8:0] level_0;
|
input [8:0] level_0;
|
input [8:0] level_1;
|
input [8:0] level_1;
|
input [8:0] level_2;
|
input [8:0] level_2;
|
input [8:0] level_3;
|
input [8:0] level_3;
|
input [8:0] level_4;
|
input [8:0] level_4;
|
input [8:0] level_5;
|
input [8:0] level_5;
|
input [8:0] level_6;
|
input [8:0] level_6;
|
input [8:0] level_7;
|
input [8:0] level_7;
|
input [8:0] level_8;
|
input [8:0] level_8;
|
input [8:0] level_9;
|
input [8:0] level_9;
|
input [8:0] level_10;
|
input [8:0] level_10;
|
input [8:0] level_11;
|
input [8:0] level_11;
|
input [8:0] level_12;
|
input [8:0] level_12;
|
input [8:0] level_13;
|
input [8:0] level_13;
|
input [8:0] level_14;
|
input [8:0] level_14;
|
input [8:0] level_15;
|
input [8:0] level_15;
|
|
|
output [8:0] coeff_0;
|
output [8:0] coeff_0;
|
output [8:0] coeff_1;
|
output [8:0] coeff_1;
|
output [8:0] coeff_2;
|
output [8:0] coeff_2;
|
output [8:0] coeff_3;
|
output [8:0] coeff_3;
|
output [8:0] coeff_4;
|
output [8:0] coeff_4;
|
output [8:0] coeff_5;
|
output [8:0] coeff_5;
|
output [8:0] coeff_6;
|
output [8:0] coeff_6;
|
output [8:0] coeff_7;
|
output [8:0] coeff_7;
|
output [8:0] coeff_8;
|
output [8:0] coeff_8;
|
output [8:0] coeff_9;
|
output [8:0] coeff_9;
|
output [8:0] coeff_10;
|
output [8:0] coeff_10;
|
output [8:0] coeff_11;
|
output [8:0] coeff_11;
|
output [8:0] coeff_12;
|
output [8:0] coeff_12;
|
output [8:0] coeff_13;
|
output [8:0] coeff_13;
|
output [8:0] coeff_14;
|
output [8:0] coeff_14;
|
output [8:0] coeff_15;
|
output [8:0] coeff_15;
|
|
|
output [3:0] ZeroLeft;
|
output [3:0] ZeroLeft;
|
|
|
output [3:0] len_comb;
|
output [3:0] len_comb;
|
|
|
//----------------------
|
//----------------------
|
//regs
|
//regs
|
//----------------------
|
//----------------------
|
reg [3:0] run;
|
reg [3:0] run;
|
reg [3:0] len;
|
reg [3:0] len;
|
reg [8:0] coeff;
|
reg [8:0] coeff;
|
|
|
|
|
reg [3:0] len_comb;
|
reg [3:0] len_comb;
|
|
|
//----------------------
|
//----------------------
|
//FFs
|
//FFs
|
//----------------------
|
//----------------------
|
reg [3:0] ZeroLeft;
|
reg [3:0] ZeroLeft;
|
|
|
reg [8:0] coeff_0;
|
reg [8:0] coeff_0;
|
reg [8:0] coeff_1;
|
reg [8:0] coeff_1;
|
reg [8:0] coeff_2;
|
reg [8:0] coeff_2;
|
reg [8:0] coeff_3;
|
reg [8:0] coeff_3;
|
reg [8:0] coeff_4;
|
reg [8:0] coeff_4;
|
reg [8:0] coeff_5;
|
reg [8:0] coeff_5;
|
reg [8:0] coeff_6;
|
reg [8:0] coeff_6;
|
reg [8:0] coeff_7;
|
reg [8:0] coeff_7;
|
reg [8:0] coeff_8;
|
reg [8:0] coeff_8;
|
reg [8:0] coeff_9;
|
reg [8:0] coeff_9;
|
reg [8:0] coeff_10;
|
reg [8:0] coeff_10;
|
reg [8:0] coeff_11;
|
reg [8:0] coeff_11;
|
reg [8:0] coeff_12;
|
reg [8:0] coeff_12;
|
reg [8:0] coeff_13;
|
reg [8:0] coeff_13;
|
reg [8:0] coeff_14;
|
reg [8:0] coeff_14;
|
reg [8:0] coeff_15;
|
reg [8:0] coeff_15;
|
|
|
//----------------------
|
//----------------------
|
//run & len
|
//run & len
|
//----------------------
|
//----------------------
|
always @(rbsp or ZeroLeft or ena or sel)
|
always @(rbsp or ZeroLeft or ena or sel)
|
if (ena && sel)
|
if (ena && sel)
|
case(ZeroLeft)
|
case(ZeroLeft)
|
0 : begin len <= 0; run <= 0; end
|
0 : begin len <= 0; run <= 0; end
|
1 : begin len <= 1; run <= rbsp[0]? 0:1; end
|
1 : begin len <= 1; run <= rbsp[0]? 0:1; end
|
2 : begin if (rbsp[0]) begin
|
2 : begin if (rbsp[0]) begin
|
run <= 0;
|
run <= 0;
|
len <= 1;
|
len <= 1;
|
end
|
end
|
else if (rbsp[1]) begin
|
else if (rbsp[1]) begin
|
run <= 1;
|
run <= 1;
|
len <= 2;
|
len <= 2;
|
end
|
end
|
else begin
|
else begin
|
run <= 2;
|
run <= 2;
|
len <= 2;
|
len <= 2;
|
end
|
end
|
end
|
end
|
3 : begin
|
3 : begin
|
run <= 3 - rbsp[0:1];
|
run <= 3 - rbsp[0:1];
|
len <= 2;
|
len <= 2;
|
end
|
end
|
4 : begin
|
4 : begin
|
if (rbsp[0:1] != 0) begin
|
if (rbsp[0:1] != 0) begin
|
run <= 3 - rbsp[0:1];
|
run <= 3 - rbsp[0:1];
|
len <= 2;
|
len <= 2;
|
end
|
end
|
else begin
|
else begin
|
run <= rbsp[2]? 3:4;
|
run <= rbsp[2]? 3:4;
|
len <= 3;
|
len <= 3;
|
end
|
end
|
end
|
end
|
5 : begin
|
5 : begin
|
if (rbsp[0]) begin
|
if (rbsp[0]) begin
|
run <= rbsp[1]? 0:1;
|
run <= rbsp[1]? 0:1;
|
len <= 2;
|
len <= 2;
|
end
|
end
|
else if (rbsp[1]) begin
|
else if (rbsp[1]) begin
|
run <= rbsp[2]? 2:3;
|
run <= rbsp[2]? 2:3;
|
len <= 3;
|
len <= 3;
|
end
|
end
|
else begin
|
else begin
|
run <= rbsp[2]? 4:5;
|
run <= rbsp[2]? 4:5;
|
len <= 3;
|
len <= 3;
|
end
|
end
|
end
|
end
|
6 : begin
|
6 : begin
|
if (rbsp[0:1] == 2'b11) begin
|
if (rbsp[0:1] == 2'b11) begin
|
run <= 0;
|
run <= 0;
|
len <= 2;
|
len <= 2;
|
end
|
end
|
else begin
|
else begin
|
len <= 3;
|
len <= 3;
|
case(rbsp[0:2])
|
case(rbsp[0:2])
|
3'b000 : run <= 1;
|
3'b000 : run <= 1;
|
3'b001 : run <= 2;
|
3'b001 : run <= 2;
|
3'b011 : run <= 3;
|
3'b011 : run <= 3;
|
3'b010 : run <= 4;
|
3'b010 : run <= 4;
|
3'b101 : run <= 5;
|
3'b101 : run <= 5;
|
default: run <= 6;
|
default: run <= 6;
|
endcase
|
endcase
|
end
|
end
|
end
|
end
|
default : begin
|
default : begin
|
if (rbsp[0:2] != 0) begin
|
if (rbsp[0:2] != 0) begin
|
run <= 7 - rbsp[0:2];
|
run <= 7 - rbsp[0:2];
|
len <= 3;
|
len <= 3;
|
end
|
end
|
else begin
|
else begin
|
case (1'b1)
|
case (1'b1)
|
rbsp[3] : begin run <= 7; len <= 4; end
|
rbsp[3] : begin run <= 7; len <= 4; end
|
rbsp[4] : begin run <= 8; len <= 5; end
|
rbsp[4] : begin run <= 8; len <= 5; end
|
rbsp[5] : begin run <= 9; len <= 6; end
|
rbsp[5] : begin run <= 9; len <= 6; end
|
rbsp[6] : begin run <= 10; len <= 7; end
|
rbsp[6] : begin run <= 10; len <= 7; end
|
rbsp[7] : begin run <= 11; len <= 8; end
|
rbsp[7] : begin run <= 11; len <= 8; end
|
rbsp[8] : begin run <= 12; len <= 9; end
|
rbsp[8] : begin run <= 12; len <= 9; end
|
rbsp[9] : begin run <= 13; len <= 10;end
|
rbsp[9] : begin run <= 13; len <= 10;end
|
rbsp[10]: begin run <= 14; len <= 11;end
|
rbsp[10]: begin run <= 14; len <= 11;end
|
default : begin run <= 'bx; len <='bx;end
|
default : begin run <= 'bx; len <='bx;end
|
endcase
|
endcase
|
end
|
end
|
end
|
end
|
endcase
|
endcase
|
else begin
|
else begin
|
len <= 0;
|
len <= 0;
|
run <= 0;
|
run <= 0;
|
end
|
end
|
|
|
//----------------------
|
//----------------------
|
//len_comb
|
//len_comb
|
//----------------------
|
//----------------------
|
always @(*)
|
always @(*)
|
if (i > 0)
|
if (i > 0)
|
len_comb <= len;
|
len_comb <= len;
|
else
|
else
|
len_comb <= 0;
|
len_comb <= 0;
|
|
|
|
|
//----------------------
|
//----------------------
|
//ZeroLeft
|
//ZeroLeft
|
//----------------------
|
//----------------------
|
always @(posedge clk or negedge rst_n)
|
always @(posedge clk or negedge rst_n)
|
if (!rst_n)
|
if (!rst_n)
|
ZeroLeft <= 0;
|
ZeroLeft <= 0;
|
else if (ena && clr) //in case TotalCoeff >= max_coeff_num
|
else if (ena && clr) //in case TotalCoeff >= max_coeff_num
|
ZeroLeft <= 0;
|
ZeroLeft <= 0;
|
else if (ena && ZeroLeft_init)
|
else if (ena && ZeroLeft_init)
|
ZeroLeft <= TotalZeros_comb;
|
ZeroLeft <= TotalZeros_comb;
|
else if (ena && sel )//if ZeroLeft == 0, run will be 0
|
else if (ena && sel )//if ZeroLeft == 0, run will be 0
|
ZeroLeft <= ZeroLeft - run;
|
ZeroLeft <= ZeroLeft - run;
|
|
|
//----------------------
|
//----------------------
|
//coeff
|
//coeff
|
//----------------------
|
//----------------------
|
always @(*)
|
always @(*)
|
if (ena && sel)
|
if (ena && sel)
|
case (i)
|
case (i)
|
0 :coeff <= level_0;
|
0 :coeff <= level_0;
|
1 :coeff <= level_1;
|
1 :coeff <= level_1;
|
2 :coeff <= level_2;
|
2 :coeff <= level_2;
|
3 :coeff <= level_3;
|
3 :coeff <= level_3;
|
4 :coeff <= level_4;
|
4 :coeff <= level_4;
|
5 :coeff <= level_5;
|
5 :coeff <= level_5;
|
6 :coeff <= level_6;
|
6 :coeff <= level_6;
|
7 :coeff <= level_7;
|
7 :coeff <= level_7;
|
8 :coeff <= level_8;
|
8 :coeff <= level_8;
|
9 :coeff <= level_9;
|
9 :coeff <= level_9;
|
10:coeff <= level_10;
|
10:coeff <= level_10;
|
11:coeff <= level_11;
|
11:coeff <= level_11;
|
12:coeff <= level_12;
|
12:coeff <= level_12;
|
13:coeff <= level_13;
|
13:coeff <= level_13;
|
14:coeff <= level_14;
|
14:coeff <= level_14;
|
15:coeff <= level_15;
|
15:coeff <= level_15;
|
endcase
|
endcase
|
else
|
else
|
coeff <= 0;
|
coeff <= 0;
|
|
|
//----------------------
|
//----------------------
|
//coeff_0 to coeff_15
|
//coeff_0 to coeff_15
|
//----------------------
|
//----------------------
|
always @(posedge clk or negedge rst_n)
|
always @(posedge clk or negedge rst_n)
|
if (!rst_n) begin
|
if (!rst_n) begin
|
coeff_0 <= 0; coeff_1 <= 0; coeff_2 <= 0; coeff_3 <= 0;
|
coeff_0 <= 0; coeff_1 <= 0; coeff_2 <= 0; coeff_3 <= 0;
|
coeff_4 <= 0; coeff_5 <= 0; coeff_6 <= 0; coeff_7 <= 0;
|
coeff_4 <= 0; coeff_5 <= 0; coeff_6 <= 0; coeff_7 <= 0;
|
coeff_8 <= 0; coeff_9 <= 0; coeff_10<= 0; coeff_11<= 0;
|
coeff_8 <= 0; coeff_9 <= 0; coeff_10<= 0; coeff_11<= 0;
|
coeff_12<= 0; coeff_13<= 0; coeff_14<= 0; coeff_15<= 0;
|
coeff_12<= 0; coeff_13<= 0; coeff_14<= 0; coeff_15<= 0;
|
end
|
end
|
else if (ena && clr) begin
|
else if (ena && clr) begin
|
coeff_0 <= 0; coeff_1 <= 0; coeff_2 <= 0; coeff_3 <= 0;
|
coeff_0 <= 0; coeff_1 <= 0; coeff_2 <= 0; coeff_3 <= 0;
|
coeff_4 <= 0; coeff_5 <= 0; coeff_6 <= 0; coeff_7 <= 0;
|
coeff_4 <= 0; coeff_5 <= 0; coeff_6 <= 0; coeff_7 <= 0;
|
coeff_8 <= 0; coeff_9 <= 0; coeff_10<= 0; coeff_11<= 0;
|
coeff_8 <= 0; coeff_9 <= 0; coeff_10<= 0; coeff_11<= 0;
|
coeff_12<= 0; coeff_13<= 0; coeff_14<= 0; coeff_15<= 0;
|
coeff_12<= 0; coeff_13<= 0; coeff_14<= 0; coeff_15<= 0;
|
end
|
end
|
else if (ena && sel && ZeroLeft > 0)
|
else if (ena && sel && ZeroLeft > 0)
|
case (ZeroLeft+i)
|
case (ZeroLeft+i)
|
1 :coeff_1 <= coeff;
|
1 :coeff_1 <= coeff;
|
2 :coeff_2 <= coeff;
|
2 :coeff_2 <= coeff;
|
3 :coeff_3 <= coeff;
|
3 :coeff_3 <= coeff;
|
4 :coeff_4 <= coeff;
|
4 :coeff_4 <= coeff;
|
5 :coeff_5 <= coeff;
|
5 :coeff_5 <= coeff;
|
6 :coeff_6 <= coeff;
|
6 :coeff_6 <= coeff;
|
7 :coeff_7 <= coeff;
|
7 :coeff_7 <= coeff;
|
8 :coeff_8 <= coeff;
|
8 :coeff_8 <= coeff;
|
9 :coeff_9 <= coeff;
|
9 :coeff_9 <= coeff;
|
10:coeff_10 <= coeff;
|
10:coeff_10 <= coeff;
|
11:coeff_11 <= coeff;
|
11:coeff_11 <= coeff;
|
12:coeff_12 <= coeff;
|
12:coeff_12 <= coeff;
|
13:coeff_13 <= coeff;
|
13:coeff_13 <= coeff;
|
14:coeff_14 <= coeff;
|
14:coeff_14 <= coeff;
|
default:
|
default:
|
coeff_15 <= coeff;
|
coeff_15 <= coeff;
|
endcase
|
endcase
|
else if (ena && sel) begin
|
else if (ena && sel) begin
|
if (i >= 0) coeff_0 <= level_0;
|
if (i >= 0) coeff_0 <= level_0;
|
if (i >= 1) coeff_1 <= level_1;
|
if (i >= 1) coeff_1 <= level_1;
|
if (i >= 2) coeff_2 <= level_2;
|
if (i >= 2) coeff_2 <= level_2;
|
if (i >= 3) coeff_3 <= level_3;
|
if (i >= 3) coeff_3 <= level_3;
|
if (i >= 4) coeff_4 <= level_4;
|
if (i >= 4) coeff_4 <= level_4;
|
if (i >= 5) coeff_5 <= level_5;
|
if (i >= 5) coeff_5 <= level_5;
|
if (i >= 6) coeff_6 <= level_6;
|
if (i >= 6) coeff_6 <= level_6;
|
if (i >= 7) coeff_7 <= level_7;
|
if (i >= 7) coeff_7 <= level_7;
|
if (i >= 8) coeff_8 <= level_8;
|
if (i >= 8) coeff_8 <= level_8;
|
if (i >= 9) coeff_9 <= level_9;
|
if (i >= 9) coeff_9 <= level_9;
|
if (i >= 10)coeff_10 <= level_10;
|
if (i >= 10)coeff_10 <= level_10;
|
if (i >= 11)coeff_11 <= level_11;
|
if (i >= 11)coeff_11 <= level_11;
|
if (i >= 12)coeff_12 <= level_12;
|
if (i >= 12)coeff_12 <= level_12;
|
if (i >= 13)coeff_13 <= level_13;
|
if (i >= 13)coeff_13 <= level_13;
|
if (i >= 14)coeff_14 <= level_14;
|
if (i >= 14)coeff_14 <= level_14;
|
if (i == 15)coeff_15 <= level_15;
|
if (i == 15)coeff_15 <= level_15;
|
end
|
end
|
endmodule
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endmodule
|
|
|
