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[/] [cavlc/] [trunk/] [rtl/] [cavlc_read_total_coeffs.v] - Blame information for rev 6

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//2011-8-7      initial creation
//2011-8-9      optimize output mux
//2011-9-10     reduce nC to 5 bits
 
 
`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, rst_n;
input   ena;
 
input   start;
input   sel;
 
 
input   [0:15]   rbsp;
input   signed  [4:0]    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
//------------------------
wire rbsp_refresh =  ena && start;
 
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 (rbsp_refresh)
begin
        if (nC[4])
                rbsp_5 <=  rbsp[0:7];
        else if (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
 
//------------------ Colum 4 : 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[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
//------------------------
wire output_refresh =  ena && sel;
 
always @(posedge clk or negedge rst_n)
if (~rst_n) begin
        TrailingOnes    <= 0;
        TotalCoeff              <= 0;
end
else if (output_refresh) begin
        TrailingOnes    <= TrailingOnes_comb;
        TotalCoeff              <= TotalCoeff_comb;
end
 
endmodule
 
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[/] [cavlc/] [trunk/] [rtl/] [cavlc_read_total_coeffs.v] - Blame information for rev 6

Line No.	Rev	Author	Line
1	6	qiubin	`//2011-8-7 initial creation`
2			`//2011-8-9 optimize output mux`
3			`//2011-9-10 reduce nC to 5 bits`
4
5
6			`include "defines.v"
7
8			`module cavlc_read_total_coeffs(`
9			`clk, rst_n,`
10			`ena,`
11
12			`start,`
13			`sel,`
14			`rbsp, nC,`
15
16			`TrailingOnes, TotalCoeff,`
17			`TrailingOnes_comb, TotalCoeff_comb,`
18			`len_comb`
19			`);`
20			`//------------------------`
21			`//ports`
22			`//------------------------`
23			`input clk, rst_n;`
24			`input ena;`
25
26			`input start;`
27			`input sel;`
28
29
30			`input [0:15] rbsp;`
31			`input signed [4:0] nC;`
32
33			`output [4:0] TotalCoeff; //range from 0 to 16`
34			`output [1:0] TrailingOnes; //range from 0 to 3`
35			`output [4:0] TotalCoeff_comb; //unsaved result of TotalCoeff_comb`
36			`output [1:0] TrailingOnes_comb; //unsaved result of TrailingOnes_comb`
37			`output [4:0] len_comb; //indicate how many rbsp bit consumed, range from 0 to 16`
38
39
40			`//------------------------`