Subversion Repositories cavlc

//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