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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
 

Line No.	Rev	Author	Line
1	7	qiubin	`//////////////////////////////////////////////////////////////////////`
2			`//// ////`
3			`//// cavlc_read_total_coeffs ////`
4			`//// ////`
5			`//// Description ////`
6			`//// decode total_coeffs and trailing ones ////`
7			`//// ////`
8			`//// Author(s): ////`
9			`//// - bin qiu, qiubin@opencores.org ////`
10			`//// ////`
11			`//////////////////////////////////////////////////////////////////////`
12			`//// ////`
13			`//// Copyright (C) 2011 Authors and OPENCORES.ORG ////`
14			`//// ////`
15			`//// This source file may be used and distributed without ////`
16			`//// restriction provided that this copyright statement is not ////`
17			`//// removed from the file and that any derivative work contains ////`
18			`//// the original copyright notice and the associated disclaimer. ////`
19			`//// ////`
20			`//// This source file is free software; you can redistribute it ////`
21			`//// and/or modify it under the terms of the GNU Lesser General ////`
22			`//// Public License as published by the Free Software Foundation; ////`
23			`//// either version 2.1 of the License, or (at your option) any ////`
24			`//// later version. ////`
25			`//// ////`
26			`//// This source is distributed in the hope that it will be ////`
27			`//// useful, but WITHOUT ANY WARRANTY; without even the implied ////`
28			`//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////`
29			`//// PURPOSE. See the GNU Lesser General Public License for more ////`
30			`//// details. ////`
31			`//// ////`
32			`//// You should have received a copy of the GNU Lesser General ////`
33			`//// Public License along with this source; if not, download it ////`
34			`//// from http://www.opencores.org/lgpl.shtml ////`
35			`//// ////`
36			`//////////////////////////////////////////////////////////////////////`
37	6	qiubin
38	7	qiubin	`//2011-8-7 initial creation`
39			`//2011-8-9 optimize output mux`
40	6	qiubin
41	7	qiubin
42	6	qiubin	`include "defines.v"
43
44	7	qiubin	`module cavlc_read_total_coeffs`
45			`(`
46			`clk,`
47			`rst_n,`
48			`ena,`
49			`start,`
50			`sel,`
51			`rbsp, nC,`
52			`TrailingOnes,`
53			`TotalCoeff,`
54			`TrailingOnes_comb,`
55			`TotalCoeff_comb,`
56			`len_comb`
57	6	qiubin	`);`
58			`//------------------------`
59			`//ports`
60			`//------------------------`
61	7	qiubin	`input clk;`
62			`input rst_n;`
63			`input ena;`
64			`input start;`
65			`input sel;`
66	6	qiubin
67	7	qiubin	`input [0:15] rbsp;`
68			`input signed [5:0] nC;`
69	6	qiubin
70	7	qiubin	`output [4:0] TotalCoeff; //range from 0 to 16`
71			`output [1:0] TrailingOnes; //range from 0 to 3`
72			`output [4:0] TotalCoeff_comb; //unsaved result of TotalCoeff_comb`
73			`output [1:0] TrailingOnes_comb; //unsaved result of TrailingOnes_comb`
74			`output [4:0] len_comb; //indicate how many rbsp bit consumed, range from 0 to 16`
75	6	qiubin
76
77			`//------------------------`
78			`//regs`
79			`//------------------------`
80	7	qiubin	`reg [4:0] TotalCoeff_comb;`
81			`reg [1:0] TrailingOnes_comb;`
82			`reg [4:0] len_comb;`
83	6	qiubin
84			`//for nC >= 0 && nC < 2`
85	7	qiubin	`reg [4:0] TotalCoeff_1;`
86			`reg [1:0] TrailingOnes_1;`
87			`reg [4:0] len_1;`
88	6	qiubin
89			`//for nC >= 2 && nC < 4`
90	7	qiubin	`reg [4:0] TotalCoeff_2;`
91			`reg [1:0] TrailingOnes_2;`
92			`reg [4:0] len_2;`
93	6	qiubin
94			`//for nC >= 4 && nC < 8`
95	7	qiubin	`reg [4:0] TotalCoeff_3;`
96			`reg [1:0] TrailingOnes_3;`
97			`reg [4:0] len_3;`
98	6	qiubin
99			`//for nC >= 8`
100	7	qiubin	`reg [4:0] TotalCoeff_4;`
101			`reg [1:0] TrailingOnes_4;`
102			`reg [4:0] len_4;`
103	6	qiubin
104			`//for nC == -1`
105	7	qiubin	`reg [4:0] TotalCoeff_5;`
106			`reg [1:0] TrailingOnes_5;`
107			`reg [4:0] len_5;`
108	6	qiubin
109
110			`//------------------------`
111			`//FFs`
112			`//------------------------`
113			`//len is not necessary to be saved`
114			//TotalCoeff & TrailingOnes should be valid when cavlc_state == `cavlc_read_total_coeffs_s
115			`//to do that,combinational result "TotalCoeff_comb & TrailingOnes_comb" are outputed`
116	7	qiubin	`reg [0:15] rbsp_1;`
117			`reg [0:13] rbsp_2;`
118			`reg [0:9] rbsp_3;`
119			`reg [0:5] rbsp_4;`
120			`reg [0:7] rbsp_5;`
121	6	qiubin
122	7	qiubin	`reg [4:0] TotalCoeff;`
123			`reg [1:0] TrailingOnes;`
124	6	qiubin
125			`//------------------------`
126			`//input mux`
127			`//------------------------`
128			`always @(posedge clk or negedge rst_n)`
129			`if (!rst_n)`
130			`begin`
131	7	qiubin	`rbsp_1 <= 0;`
132			`rbsp_2 <= 0;`
133			`rbsp_3 <= 0;`
134			`rbsp_4 <= 0;`
135			`rbsp_5 <= 0;`
136	6	qiubin
137			`end`
138	7	qiubin	`else if (ena && start)`
139	6	qiubin	`begin`
140	7	qiubin	`if (nC[5])`
141			`rbsp_5 <= rbsp[0:7];`
142			`else if ( nC[4] \|\| nC[3])`
143			`rbsp_4 <= rbsp[0:5];`
144			`else if (nC[2])`
145			`rbsp_3 <= rbsp[0:9];`
146			`else if (nC[1])`
147			`rbsp_2 <= rbsp[0:13];`
148			`else`
149			`rbsp_1 <= rbsp;`
150	6	qiubin	`end`
151			`//------------------------`
152	7	qiubin	`//nC >= 0 && nC < 2`
153	6	qiubin	`//------------------------`
154			`always @(rbsp_1)`
155	7	qiubin	`case (1'b1)`
156	6	qiubin	`rbsp_1[0] : begin`
157	7	qiubin	`TrailingOnes_1 <= 0;`
158			`TotalCoeff_1 <= 0;`
159			`len_1 <= 1;`
160	6	qiubin	`end`
161			`rbsp_1[1] : begin`
162	7	qiubin	`TrailingOnes_1 <= 1;`
163			`TotalCoeff_1 <= 1;`
164			`len_1 <= 2;`
165	6	qiubin	`end`
166			`rbsp_1[2] : begin`
167	7	qiubin	`TrailingOnes_1 <= 2;`
168			`TotalCoeff_1 <= 2;`
169			`len_1 <= 3;`
170	6	qiubin	`end`
171			`rbsp_1[3] : begin`
172	7	qiubin	`if (rbsp_1[4] == 'b1) begin`
173			`TrailingOnes_1 <= 3;`
174			`TotalCoeff_1 <= 3;`
175			`len_1 <= 5;`
176			`end`
177			`else if (rbsp_1[5] == 'b1) begin`
178			`TrailingOnes_1 <= 0;`
179			`TotalCoeff_1 <= 1;`
180			`len_1 <= 6;`
181			`end`
182			`else begin`
183			`TrailingOnes_1 <= 1;`
184			`TotalCoeff_1 <= 2;`
185			`len_1 <= 6;`
186			`end`
187	6	qiubin	`end`
188			`rbsp_1[4] : begin`
189	7	qiubin	`if (rbsp_1[5] == 'b1) begin`
190			`TrailingOnes_1 <= 3;`
191			`TotalCoeff_1 <= 4;`
192			`len_1 <= 6;`
193			`end`
194			`else if (rbsp_1[6] == 'b1) begin`
195			`TrailingOnes_1 <= 2;`
196			`TotalCoeff_1 <= 3;`
197			`len_1 <= 7;`
198			`end`
199			`else begin`
200			`TrailingOnes_1 <= 3;`
201			`TotalCoeff_1 <= 5;`
202			`len_1 <= 7;`
203			`end`
204	6	qiubin	`end`
205			`rbsp_1[5] : begin`
206	7	qiubin	`len_1 <= 8;`
207			`if (rbsp_1[6:7] == 'b11) begin`
208			`TrailingOnes_1 <= 0;`
209			`TotalCoeff_1 <= 2;`
210			`end`
211			`else if (rbsp_1[6:7] == 'b10) begin`
212			`TrailingOnes_1 <= 1;`
213			`TotalCoeff_1 <= 3;`
214			`end`
215			`else if (rbsp_1[6:7] == 'b01) begin`
216			`TrailingOnes_1 <= 2;`
217			`TotalCoeff_1 <= 4;`
218			`end`
219			`else begin`
220			`TrailingOnes_1 <= 3;`
221			`TotalCoeff_1 <= 6;`
222			`end`
223	6	qiubin	`end`
224			`rbsp_1[6] : begin`
225	7	qiubin	`len_1 <= 9;`
226			`if (rbsp_1[7:8] == 2'b11) begin`
227			`TrailingOnes_1 <= 0;`
228			`TotalCoeff_1 <= 3;`
229			`end`
230			`else if (rbsp_1[7:8] == 2'b10) begin`
231			`TrailingOnes_1 <= 1;`
232			`TotalCoeff_1 <= 4;`
233			`end`
234			`else if (rbsp_1[7:8] == 2'b01) begin`
235			`TrailingOnes_1 <= 2;`
236			`TotalCoeff_1 <= 5;`
237			`end`
238			`else begin`
239			`TrailingOnes_1 <= 3;`
240			`TotalCoeff_1 <= 7;`
241			`end`
242	6	qiubin	`end`
243			`rbsp_1[7] : begin`
244	7	qiubin	`len_1 <= 10;`
245			`if (rbsp_1[8:9] == 2'b11) begin`
246			`TrailingOnes_1 <= 0;`
247			`TotalCoeff_1 <= 4;`
248			`end`
249			`else if (rbsp_1[8:9] == 2'b10) begin`
250			`TrailingOnes_1 <= 1;`
251			`TotalCoeff_1 <= 5;`
252			`end`
253			`else if (rbsp_1[8:9] == 2'b01) begin`
254			`TrailingOnes_1 <= 2;`
255			`TotalCoeff_1 <= 6;`
256			`end`
257			`else begin`
258			`TrailingOnes_1 <= 3;`
259			`TotalCoeff_1 <= 8;`
260			`end`
261	6	qiubin	`end`
262			`rbsp_1[8] : begin`
263	7	qiubin	`len_1 <= 11;`
264			`if (rbsp_1[9:10] == 2'b11) begin`
265			`TrailingOnes_1 <= 0;`
266			`TotalCoeff_1 <= 5;`
267			`end`
268			`else if (rbsp_1[9:10] == 2'b10) begin`
269			`TrailingOnes_1 <= 1;`
270			`TotalCoeff_1 <= 6;`
271			`end`
272			`else if (rbsp_1[9:10] == 2'b01) begin`
273			`TrailingOnes_1 <= 2;`
274			`TotalCoeff_1 <= 7;`
275			`end`
276			`else begin`
277			`TrailingOnes_1 <= 3;`
278			`TotalCoeff_1 <= 9;`
279			`end`
280	6	qiubin	`end`
281			`rbsp_1[9] : begin`
282	7	qiubin	`len_1 <= 13;`
283			`if (rbsp_1[10:12] == 3'b111) begin`
284			`TrailingOnes_1 <= 0;`
285			`TotalCoeff_1 <= 6;`
286			`end`
287			`else if (rbsp_1[10:12] == 3'b011) begin`
288			`TrailingOnes_1 <= 0;`
289			`TotalCoeff_1 <= 7;`
290			`end`
291			`else if (rbsp_1[10:12] == 3'b110) begin`
292			`TrailingOnes_1 <= 1;`
293			`TotalCoeff_1 <= 7;`
294			`end`
295			`else if (rbsp_1[10:12] == 3'b000) begin`
296			`TrailingOnes_1 <= 0;`
297			`TotalCoeff_1 <= 8;`
298			`end`
299			`else if (rbsp_1[10:12] == 3'b010) begin`
300			`TrailingOnes_1 <= 1;`
301			`TotalCoeff_1 <= 8;`
302			`end`
303			`else if (rbsp_1[10:12] == 3'b101) begin`
304			`TrailingOnes_1 <= 2;`
305			`TotalCoeff_1 <= 8;`
306			`end`
307			`else if (rbsp_1[10:12] == 3'b001) begin`
308			`TrailingOnes_1 <= 2;`
309			`TotalCoeff_1 <= 9;`
310			`end`
311			`else begin`
312			`TrailingOnes_1 <= 3;`
313			`TotalCoeff_1 <= 10;`
314			`end`
315	6	qiubin	`end`
316			`rbsp_1[10] : begin`
317	7	qiubin	`len_1 <= 14;`
318			`if (rbsp_1[11:13] == 3'b111) begin`
319			`TrailingOnes_1 <= 0;`
320			`TotalCoeff_1 <= 9;`
321			`end`
322			`else if (rbsp_1[11:13] == 3'b110) begin`
323			`TrailingOnes_1 <= 1;`
324			`TotalCoeff_1 <= 9;`
325			`end`
326			`else if (rbsp_1[11:13] == 3'b011) begin`
327			`TrailingOnes_1 <= 0;`
328			`TotalCoeff_1 <= 10;`
329			`end`
330			`else if (rbsp_1[11:13] == 3'b010) begin`
331			`TrailingOnes_1 <= 1;`
332			`TotalCoeff_1 <= 10;`
333			`end`
334			`else if (rbsp_1[11:13] == 3'b101) begin`
335			`TrailingOnes_1 <= 2;`
336			`TotalCoeff_1 <= 10;`
337			`end`
338			`else if (rbsp_1[11:13] == 3'b001) begin`
339			`TrailingOnes_1 <= 2;`
340			`TotalCoeff_1 <= 11;`
341			`end`
342			`else if (rbsp_1[11:13] == 3'b100) begin`
343			`TrailingOnes_1 <= 3;`
344			`TotalCoeff_1 <= 11;`
345			`end`
346			`else begin`
347			`TrailingOnes_1 <= 3;`
348			`TotalCoeff_1 <= 12;`
349			`end`
350	6	qiubin	`end`
351			`rbsp_1[11] : begin`
352	7	qiubin	`len_1 <= 15;`
353			`if (rbsp_1[12:14] == 3'b111) begin`
354			`TrailingOnes_1 <= 0;`
355			`TotalCoeff_1 <= 11;`
356			`end`
357			`else if (rbsp_1[12:14] == 3'b110) begin`
358			`TrailingOnes_1 <= 1;`
359			`TotalCoeff_1 <= 11;`
360			`end`
361			`else if (rbsp_1[12:14] == 3'b011) begin`
362			`TrailingOnes_1 <= 0;`
363			`TotalCoeff_1 <= 12;`
364			`end`
365			`else if (rbsp_1[12:14] == 3'b010) begin`
366			`TrailingOnes_1 <= 1;`
367			`TotalCoeff_1 <= 12;`
368			`end`
369			`else if (rbsp_1[12:14] == 3'b101) begin`
370			`TrailingOnes_1 <= 2;`
371			`TotalCoeff_1 <= 12;`
372			`end`
373			`else if (rbsp_1[12:14] == 3'b001) begin`
374			`TrailingOnes_1 <= 2;`
375			`TotalCoeff_1 <= 13;`
376			`end`
377			`else if (rbsp_1[12:14] == 3'b100) begin`
378			`TrailingOnes_1 <= 3;`
379			`TotalCoeff_1 <= 13;`
380			`end`
381			`else begin`
382			`TrailingOnes_1 <= 3;`
383			`TotalCoeff_1 <= 14;`
384			`end`
385	6	qiubin	`end`
386			`rbsp_1[12] : begin`
387	7	qiubin	`len_1 <= 16;`
388			`if (rbsp_1[13:15] == 3'b111) begin`
389			`TrailingOnes_1 <= 0;`
390			`TotalCoeff_1 <= 13;`
391			`end`
392			`else if (rbsp_1[13:15] == 3'b011) begin`
393			`TrailingOnes_1 <= 0;`
394			`TotalCoeff_1 <= 14;`
395			`end`
396			`else if (rbsp_1[13:15] == 3'b110) begin`
397			`TrailingOnes_1 <= 1;`
398			`TotalCoeff_1 <= 14;`
399			`end`
400			`else if (rbsp_1[13:15] == 3'b101) begin`
401			`TrailingOnes_1 <= 2;`
402			`TotalCoeff_1 <= 14;`
403			`end`
404			`else if (rbsp_1[13:15] == 3'b010) begin`
405			`TrailingOnes_1 <= 1;`
406			`TotalCoeff_1 <= 15;`
407			`end`
408			`else if (rbsp_1[13:15] == 3'b001) begin`
409			`TrailingOnes_1 <= 2;`
410			`TotalCoeff_1 <= 15;`
411			`end`
412			`else if (rbsp_1[13:15] == 3'b100) begin`
413			`TrailingOnes_1 <= 3;`
414			`TotalCoeff_1 <= 15;`
415			`end`
416			`else begin`
417			`TrailingOnes_1 <= 3;`
418			`TotalCoeff_1 <= 16;`
419			`end`
420	6	qiubin	`end`
421			`rbsp_1[13] : begin`
422	7	qiubin	`len_1 <= 16;`
423			`if (rbsp_1[14:15] == 2'b11) begin`
424			`TrailingOnes_1 <= 0;`
425			`TotalCoeff_1 <= 15;`
426			`end`
427			`else if (rbsp_1[14:15] == 2'b00) begin`
428			`TrailingOnes_1 <= 0;`
429			`TotalCoeff_1 <= 16;`
430			`end`
431			`else if (rbsp_1[14:15] == 2'b10) begin`
432			`TrailingOnes_1 <= 1;`
433			`TotalCoeff_1 <= 16;`
434			`end`
435			`else begin`
436			`TrailingOnes_1 <= 2;`
437			`TotalCoeff_1 <= 16;`
438			`end`
439	6	qiubin	`end`
440			`default : begin`
441	7	qiubin	`len_1 <= 15;`
442			`TrailingOnes_1 <= 1;`
443			`TotalCoeff_1 <= 13;`
444	6	qiubin	`end`
445			`endcase`
446
447			`//------------------------`
448			`//nC >= 2 && nC < 4`
449			`//------------------------`
450			`always @(rbsp_2)`
451	7	qiubin	`case (1'b1)`
452	6	qiubin	`rbsp_2[0] : begin`
453	7	qiubin	`len_2 <= 2;`
454			`if (rbsp_2[1] == 'b1) begin`
455			`TrailingOnes_2 <= 0;`
456			`TotalCoeff_2 <= 0;`
457			`end`
458			`else begin`
459			`TrailingOnes_2 <= 1;`
460			`TotalCoeff_2 <= 1;`
461			`end`
462	6	qiubin	`end`
463			`rbsp_2[1] : begin`
464	7	qiubin	`if (rbsp_2[2] == 'b1) begin`
465			`TrailingOnes_2 <= 2;`
466			`TotalCoeff_2 <= 2;`
467			`len_2 <= 3;`
468			`end`
469			`else if (rbsp_2[3] == 'b1) begin`
470			`TrailingOnes_2 <= 3;`
471			`TotalCoeff_2 <= 3;`
472			`len_2 <= 4;`
473			`end`
474			`else begin`
475			`TrailingOnes_2 <= 3;`
476			`TotalCoeff_2 <= 4;`
477			`len_2 <= 4;`
478			`end`
479	6	qiubin	`end`
480			`rbsp_2[2] : begin`
481	7	qiubin	`if (rbsp_2[3:4] == 'b11) begin`
482			`TrailingOnes_2 <= 1;`
483			`TotalCoeff_2 <= 2;`
484			`len_2 <= 5;`
485			`end`
486			`else if (rbsp_2[3:4] == 'b10) begin`
487			`TrailingOnes_2 <= 3;`
488			`TotalCoeff_2 <= 5;`
489			`len_2 <= 5;`
490			`end`
491			`else if (rbsp_2[4:5] == 'b11) begin`
492			`TrailingOnes_2 <= 0;`
493			`TotalCoeff_2 <= 1;`
494			`len_2 <= 6;`
495			`end`
496			`else if (rbsp_2[4:5] == 'b10) begin`
497			`TrailingOnes_2 <= 1;`
498			`TotalCoeff_2 <= 3;`
499			`len_2 <= 6;`
500			`end`

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