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SOFA/BENCHMARK/cavlc_top/rtl/cavlc_read_total_coeffs.v

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31 KiB
Verilog
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//////////////////////////////////////////////////////////////////////
//// ////
//// cavlc_read_total_coeffs ////
//// ////
//// Description ////
//// decode total_coeffs and trailing ones ////
//// ////
//// 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//2011-8-7 initial creation
//2011-8-9 optimize output mux
`include "defines.v"
module cavlc_read_total_coeffs
(
clk,
rst_n,
ena,
start,
sel,
rbsp, nC,
TrailingOnes,
TotalCoeff,
TrailingOnes_comb,
TotalCoeff_comb,
len_comb
);
//------------------------
//ports
//------------------------
input clk;
input rst_n;
input ena;
input start;
input sel;
input [0:15] rbsp;
input signed [5:0] nC;
output [4:0] TotalCoeff; //range from 0 to 16
output [1:0] TrailingOnes; //range from 0 to 3
output [4:0] TotalCoeff_comb; //unsaved result of TotalCoeff_comb
output [1:0] TrailingOnes_comb; //unsaved result of TrailingOnes_comb
output [4:0] len_comb; //indicate how many rbsp bit consumed, range from 0 to 16
//------------------------
//regs
//------------------------
reg [4:0] TotalCoeff_comb;
reg [1:0] TrailingOnes_comb;
reg [4:0] len_comb;
//for nC >= 0 && nC < 2
reg [4:0] TotalCoeff_1;
reg [1:0] TrailingOnes_1;
reg [4:0] len_1;
//for nC >= 2 && nC < 4
reg [4:0] TotalCoeff_2;
reg [1:0] TrailingOnes_2;
reg [4:0] len_2;
//for nC >= 4 && nC < 8
reg [4:0] TotalCoeff_3;
reg [1:0] TrailingOnes_3;
reg [4:0] len_3;
//for nC >= 8
reg [4:0] TotalCoeff_4;
reg [1:0] TrailingOnes_4;
reg [4:0] len_4;
//for nC == -1
reg [4:0] TotalCoeff_5;
reg [1:0] TrailingOnes_5;
reg [4:0] len_5;
//------------------------
//FFs
//------------------------
//len is not necessary to be saved
//TotalCoeff & TrailingOnes should be valid when cavlc_state == `cavlc_read_total_coeffs_s
//to do that,combinational result "TotalCoeff_comb & TrailingOnes_comb" are outputed
reg [0:15] rbsp_1;
reg [0:13] rbsp_2;
reg [0:9] rbsp_3;
reg [0:5] rbsp_4;
reg [0:7] rbsp_5;
reg [4:0] TotalCoeff;
reg [1:0] TrailingOnes;
//------------------------
//input mux
//------------------------
always @(posedge clk or negedge rst_n)
if (!rst_n)
begin
rbsp_1 <= 0;
rbsp_2 <= 0;
rbsp_3 <= 0;
rbsp_4 <= 0;
rbsp_5 <= 0;
end
else if (ena && start)
begin
if (nC[5])
rbsp_5 <= rbsp[0:7];
else if ( nC[4] || nC[3])
rbsp_4 <= rbsp[0:5];
else if (nC[2])
rbsp_3 <= rbsp[0:9];
else if (nC[1])
rbsp_2 <= rbsp[0:13];
else
rbsp_1 <= rbsp;
end
//------------------------
//nC >= 0 && nC < 2
//------------------------
always @(rbsp_1)
case (1'b1)
rbsp_1[0] : begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 0;
len_1 <= 1;
end
rbsp_1[1] : begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 1;
len_1 <= 2;
end
rbsp_1[2] : begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 2;
len_1 <= 3;
end
rbsp_1[3] : begin
if (rbsp_1[4] == 'b1) begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 3;
len_1 <= 5;
end
else if (rbsp_1[5] == 'b1) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 1;
len_1 <= 6;
end
else begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 2;
len_1 <= 6;
end
end
rbsp_1[4] : begin
if (rbsp_1[5] == 'b1) begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 4;
len_1 <= 6;
end
else if (rbsp_1[6] == 'b1) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 3;
len_1 <= 7;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 5;
len_1 <= 7;
end
end
rbsp_1[5] : begin
len_1 <= 8;
if (rbsp_1[6:7] == 'b11) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 2;
end
else if (rbsp_1[6:7] == 'b10) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 3;
end
else if (rbsp_1[6:7] == 'b01) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 4;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 6;
end
end
rbsp_1[6] : begin
len_1 <= 9;
if (rbsp_1[7:8] == 2'b11) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 3;
end
else if (rbsp_1[7:8] == 2'b10) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 4;
end
else if (rbsp_1[7:8] == 2'b01) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 5;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 7;
end
end
rbsp_1[7] : begin
len_1 <= 10;
if (rbsp_1[8:9] == 2'b11) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 4;
end
else if (rbsp_1[8:9] == 2'b10) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 5;
end
else if (rbsp_1[8:9] == 2'b01) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 6;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 8;
end
end
rbsp_1[8] : begin
len_1 <= 11;
if (rbsp_1[9:10] == 2'b11) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 5;
end
else if (rbsp_1[9:10] == 2'b10) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 6;
end
else if (rbsp_1[9:10] == 2'b01) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 7;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 9;
end
end
rbsp_1[9] : begin
len_1 <= 13;
if (rbsp_1[10:12] == 3'b111) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 6;
end
else if (rbsp_1[10:12] == 3'b011) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 7;
end
else if (rbsp_1[10:12] == 3'b110) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 7;
end
else if (rbsp_1[10:12] == 3'b000) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 8;
end
else if (rbsp_1[10:12] == 3'b010) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 8;
end
else if (rbsp_1[10:12] == 3'b101) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 8;
end
else if (rbsp_1[10:12] == 3'b001) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 9;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 10;
end
end
rbsp_1[10] : begin
len_1 <= 14;
if (rbsp_1[11:13] == 3'b111) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 9;
end
else if (rbsp_1[11:13] == 3'b110) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 9;
end
else if (rbsp_1[11:13] == 3'b011) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 10;
end
else if (rbsp_1[11:13] == 3'b010) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 10;
end
else if (rbsp_1[11:13] == 3'b101) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 10;
end
else if (rbsp_1[11:13] == 3'b001) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 11;
end
else if (rbsp_1[11:13] == 3'b100) begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 11;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 12;
end
end
rbsp_1[11] : begin
len_1 <= 15;
if (rbsp_1[12:14] == 3'b111) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 11;
end
else if (rbsp_1[12:14] == 3'b110) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 11;
end
else if (rbsp_1[12:14] == 3'b011) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 12;
end
else if (rbsp_1[12:14] == 3'b010) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 12;
end
else if (rbsp_1[12:14] == 3'b101) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 12;
end
else if (rbsp_1[12:14] == 3'b001) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 13;
end
else if (rbsp_1[12:14] == 3'b100) begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 13;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 14;
end
end
rbsp_1[12] : begin
len_1 <= 16;
if (rbsp_1[13:15] == 3'b111) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 13;
end
else if (rbsp_1[13:15] == 3'b011) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 14;
end
else if (rbsp_1[13:15] == 3'b110) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 14;
end
else if (rbsp_1[13:15] == 3'b101) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 14;
end
else if (rbsp_1[13:15] == 3'b010) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 15;
end
else if (rbsp_1[13:15] == 3'b001) begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 15;
end
else if (rbsp_1[13:15] == 3'b100) begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 15;
end
else begin
TrailingOnes_1 <= 3;
TotalCoeff_1 <= 16;
end
end
rbsp_1[13] : begin
len_1 <= 16;
if (rbsp_1[14:15] == 2'b11) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 15;
end
else if (rbsp_1[14:15] == 2'b00) begin
TrailingOnes_1 <= 0;
TotalCoeff_1 <= 16;
end
else if (rbsp_1[14:15] == 2'b10) begin
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 16;
end
else begin
TrailingOnes_1 <= 2;
TotalCoeff_1 <= 16;
end
end
default : begin
len_1 <= 15;
TrailingOnes_1 <= 1;
TotalCoeff_1 <= 13;
end
endcase
//------------------------
//nC >= 2 && nC < 4
//------------------------
always @(rbsp_2)
case (1'b1)
rbsp_2[0] : begin
len_2 <= 2;
if (rbsp_2[1] == 'b1) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 0;
end
else begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 1;
end
end
rbsp_2[1] : begin
if (rbsp_2[2] == 'b1) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 2;
len_2 <= 3;
end
else if (rbsp_2[3] == 'b1) begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 3;
len_2 <= 4;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 4;
len_2 <= 4;
end
end
rbsp_2[2] : begin
if (rbsp_2[3:4] == 'b11) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 2;
len_2 <= 5;
end
else if (rbsp_2[3:4] == 'b10) begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 5;
len_2 <= 5;
end
else if (rbsp_2[4:5] == 'b11) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 1;
len_2 <= 6;
end
else if (rbsp_2[4:5] == 'b10) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 3;
len_2 <= 6;
end
else if (rbsp_2[4:5] == 'b01) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 3;
len_2 <= 6;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 6;
len_2 <= 6;
end
end
rbsp_2[3] : begin
len_2 <= 6;
if (rbsp_2[4:5] == 'b11) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 2;
end
else if (rbsp_2[4:5] == 'b10) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 4;
end
else if (rbsp_2[4:5] == 'b01) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 4;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 7;
end
end
rbsp_2[4] : begin
len_2 <= 7;
if (rbsp_2[5:6] == 'b11) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 3;
end
else if (rbsp_2[5:6] == 'b10) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 5;
end
else if (rbsp_2[5:6] == 'b01) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 5;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 8;
end
end
rbsp_2[5] : begin
len_2 <= 8;
if (rbsp_2[6:7] == 'b11) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 4;
end
else if (rbsp_2[6:7] == 'b00) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 5;
end
else if (rbsp_2[6:7] == 'b10) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 6;
end
else begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 6;
end
end
rbsp_2[6] : begin
len_2 <= 9;
if (rbsp_2[7:8] == 'b11) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 6;
end
else if (rbsp_2[7:8] == 'b10) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 7;
end
else if (rbsp_2[7:8] == 'b01) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 7;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 9;
end
end
rbsp_2[7] : begin
len_2 <= 11;
if (rbsp_2[8:10] == 'b111) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 7;
end
else if (rbsp_2[8:10] == 'b011) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 8;
end
else if (rbsp_2[8:10] == 'b110) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 8;
end
else if (rbsp_2[8:10] == 'b101) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 8;
end
else if (rbsp_2[8:10] == 'b010) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 9;
end
else if (rbsp_2[8:10] == 'b001) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 9;
end
else if (rbsp_2[8:10] == 'b100) begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 10;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 11;
end
end
rbsp_2[8] : begin
len_2 <= 12;
if (rbsp_2[9:11] == 'b111) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 9;
end
else if (rbsp_2[9:11] == 'b011) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 10;
end
else if (rbsp_2[9:11] == 'b110) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 10;
end
else if (rbsp_2[9:11] == 'b101) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 10;
end
else if (rbsp_2[9:11] == 'b000) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 11;
end
else if (rbsp_2[9:11] == 'b010) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 11;
end
else if (rbsp_2[9:11] == 'b001) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 11;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 12;
end
end
rbsp_2[9] : begin
len_2 <= 13;
if (rbsp_2[10:12] == 'b111) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 12;
end
else if (rbsp_2[10:12] == 'b110) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 12;
end
else if (rbsp_2[10:12] == 'b101) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 12;
end
else if (rbsp_2[10:12] == 'b011) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 13;
end
else if (rbsp_2[10:12] == 'b010) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 13;
end
else if (rbsp_2[10:12] == 'b001) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 13;
end
else if (rbsp_2[10:12] == 'b100) begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 13;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 14;
end
end
rbsp_2[10] : begin
if (rbsp_2[11:12] == 'b11) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 14;
len_2 <= 13;
end
else if (rbsp_2[11:12] == 'b10) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 14;
len_2 <= 13;
end
else if (rbsp_2[12:13] == 'b11) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 14;
len_2 <= 14;
end
else if (rbsp_2[12:13] == 'b01) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 15;
len_2 <= 14;
end
else if (rbsp_2[12:13] == 'b00) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 15;
len_2 <= 14;
end
else begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 15;
len_2 <= 14;
end
end
rbsp_2[11] : begin
len_2 <= 14;
if (rbsp_2[12:13] == 'b11) begin
TrailingOnes_2 <= 0;
TotalCoeff_2 <= 16;
end
else if (rbsp_2[12:13] == 'b10) begin
TrailingOnes_2 <= 1;
TotalCoeff_2 <= 16;
end
else if (rbsp_2[12:13] == 'b01) begin
TrailingOnes_2 <= 2;
TotalCoeff_2 <= 16;
end
else begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 16;
end
end
default : begin
TrailingOnes_2 <= 3;
TotalCoeff_2 <= 15;
len_2 <= 13;
end
endcase
//------------------------
// nC >= 4 && nC < 8
//------------------------
always @(rbsp_3)
case (1'b1)
rbsp_3[0] : begin
len_3 <= 4;
case (rbsp_3[1:3])
'b111 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 0;
end
'b110 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 1;
end
'b101 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 2;
end
'b100 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 3;
end
'b011 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 4;
end
'b010 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 5;
end
'b001 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 6;
end
'b000 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 7;
end
endcase
end
rbsp_3[1] : begin
len_3 <= 5;
case (rbsp_3[2:4])
'b111 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 2;
end
'b100 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 3;
end
'b110 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 3;
end
'b010 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 4;
end
'b011 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 4;
end
'b000 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 5;
end
'b001 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 5;
end
'b101 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 8;
end
endcase
end
rbsp_3[2] : begin
len_3 <= 6;
case (rbsp_3[3:5])
3'b111 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 1;
end
3'b011 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 2;
end
3'b000 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 3;
end
3'b110 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 6;
end
3'b101 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 6;
end
3'b010 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 7;
end
3'b001 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 7;
end
3'b100 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 9;
end
endcase
end
rbsp_3[3] : begin
len_3 <= 7;
case (rbsp_3[4:6])
'b111 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 4;
end
'b011 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 5;
end
'b001 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 6;
end
'b000 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 7;
end
'b110 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 8;
end
'b101 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 8;
end
'b010 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 9;
end
'b100 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 10;
end
endcase
end
rbsp_3[4] : begin
len_3 <= 8;
case (rbsp_3[5:7])
'b111 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 8;
end
'b011 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 9;
end
'b110 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 9;
end
'b010 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 10;
end
'b101 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 10;
end
'b001 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 11;
end
'b100 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 11;
end
'b000 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 12;
end
endcase
end
rbsp_3[5] : begin
len_3 <= 9;
case (rbsp_3[6:8])
'b111 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 10;
end
'b011 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 11;
end
'b110 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 11;
end
'b000 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 12;
end
'b010 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 12;
end
'b101 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 12;
end
'b001 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 13;
end
'b100 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 13;
end
endcase
end
rbsp_3[6] : begin
if (rbsp_3[7:8] == 'b11)begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 13;
len_3 <= 9;
end
else if (rbsp_3[7:9] == 'b101)begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 13;
len_3 <= 10;
end
else if (rbsp_3[7:9] == 'b001)begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 14;
len_3 <= 10;
end
else if (rbsp_3[7:9] == 'b100)begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 14;
len_3 <= 10;
end
else if (rbsp_3[7:9] == 'b011)begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 14;
len_3 <= 10;
end
else if (rbsp_3[7:9] == 'b010)begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 14;
len_3 <= 10;
end
else begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 15;
len_3 <= 10;
end
end
rbsp_3[7] : begin
len_3 <= 10;
case (rbsp_3[8:9])
'b01 : begin
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 15;
end
'b11 : begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 15;
end
'b10 : begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 15;
end
'b00 : begin
TrailingOnes_3 <= 1;
TotalCoeff_3 <= 16;
end
endcase
end
rbsp_3[8] : begin
len_3 <= 10;
if (rbsp_3[9] == 'b1)begin
TrailingOnes_3 <= 2;
TotalCoeff_3 <= 16;
end
else begin
TrailingOnes_3 <= 3;
TotalCoeff_3 <= 16;
end
end
default : begin
len_3 <= 10;
TrailingOnes_3 <= 0;
TotalCoeff_3 <= 16;
end
endcase
//------------------------
// nC > 8
//------------------------
always @(rbsp_4)
begin
len_4 <= 6;
if (rbsp_4[0:4] == 5'b00001) begin
TrailingOnes_4 <= 0;
TotalCoeff_4 <= 0;
end
else begin
TrailingOnes_4 <= rbsp_4[4:5];
TotalCoeff_4 <= rbsp_4[0:3] + 1'b1;
end
end
//------------------------
// nC == -1
//------------------------
always @(rbsp_5)
case (1'b1)
rbsp_5[0] : begin
TrailingOnes_5 <= 1;
TotalCoeff_5 <= 1;
len_5 <= 1;
end
rbsp_5[1] : begin
TrailingOnes_5 <= 0;
TotalCoeff_5 <= 0;
len_5 <= 2;
end
rbsp_5[2] : begin
TrailingOnes_5 <= 2;
TotalCoeff_5 <= 2;
len_5 <= 3;
end
rbsp_5[3] : begin
len_5 <= 6;
if (rbsp_5[4:5] == 'b11) begin
TrailingOnes_5 <= 0;
TotalCoeff_5 <= 1;
end
else if (rbsp_5[4:5] == 'b00) begin
TrailingOnes_5 <= 0;
TotalCoeff_5 <= 2;
end
else if (rbsp_5[4:5] == 'b10) begin
TrailingOnes_5 <= 1;
TotalCoeff_5 <= 2;
end
else begin
TrailingOnes_5 <= 3;
TotalCoeff_5 <= 3;
end
end
rbsp_5[4] : begin
len_5 <= 6;
if (rbsp_5[5] == 'b1) begin
TrailingOnes_5 <= 0;
TotalCoeff_5 <= 3;
end
else begin
TrailingOnes_5 <= 0;
TotalCoeff_5 <= 4;
end
end
rbsp_5[5] : begin
len_5 <= 7;
if (rbsp_5[6] == 'b1) begin
TrailingOnes_5 <= 1;
TotalCoeff_5 <= 3;
end
else begin
TrailingOnes_5 <= 2;
TotalCoeff_5 <= 3;
end
end
rbsp_5[6] : begin
len_5 <= 8;
if (rbsp_5[7] == 'b1) begin
TrailingOnes_5 <= 1;
TotalCoeff_5 <= 4;
end
else begin
TrailingOnes_5 <= 2;
TotalCoeff_5 <= 4;
end
end
default : begin
len_5 <= 7;
TrailingOnes_5 <= 3;
TotalCoeff_5 <= 4;
end
endcase
//------------------------
//output mux
//------------------------
//startect a colum according to nC
always @(*)
begin
if (nC == -1) begin
TrailingOnes_comb <= TrailingOnes_5;
TotalCoeff_comb <= TotalCoeff_5;
len_comb <= len_5;
end
else if (nC[4] | nC[3]) begin
TrailingOnes_comb <= TrailingOnes_4;
TotalCoeff_comb <= TotalCoeff_4;
len_comb <= len_4;
end
else if (nC[2]) begin
TrailingOnes_comb <= TrailingOnes_3;
TotalCoeff_comb <= TotalCoeff_3;
len_comb <= len_3;
end
else if (nC[1]) begin
TrailingOnes_comb <= TrailingOnes_2;
TotalCoeff_comb <= TotalCoeff_2;
len_comb <= len_2;
end
else begin
TrailingOnes_comb <= TrailingOnes_1;
TotalCoeff_comb <= TotalCoeff_1;
len_comb <= len_1;
end
end
//------------------------
//TrailingOnes & TotalCoeff
//------------------------
always @(posedge clk or negedge rst_n)
if (!rst_n) begin
TrailingOnes <= 0;
TotalCoeff <= 0;
end
else if (ena && sel) begin
TrailingOnes <= TrailingOnes_comb;
TotalCoeff <= TotalCoeff_comb;
end
endmodule
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