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[/] [cavlc/] [trunk/] [rtl/] [cavlc_read_total_zeros.v] - Rev 6

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//2011-8-14 initial version
 
`include "defines.v"
 
module cavlc_read_total_zeros(
	ena,
	sel,
	chroma_DC_sel,
	rbsp,
	TotalCoeff,
	TotalZeros_comb,
	len_comb
);
//------------------------
//ports
//------------------------
input	ena;
input	sel;
input	chroma_DC_sel;
input	[0:8]	rbsp;
input	[3:0]	TotalCoeff;
 
output	[3:0]	TotalZeros_comb;
output	[3:0]	len_comb;
 
//-------------------------
//rregs
//-------------------------
reg		[3:0]	TotalZeros_comb;	//TotalZeros will be saved as ZeroLeft in module cavlc_read_run_befores 
reg		[3:0]	len_comb;
 
 
//for  chroma_DC
reg		[0:2]	rbsp_chroma_DC;  		
reg		[1:0]	TotalZeros_chroma_DC;
reg		[1:0]	len_chroma_DC;
 
//for TotalCoeff <= 3
reg		[0:8]	rbsp_LE3;  		
reg		[3:0]	TotalZeros_LE3;
reg		[3:0]	len_LE3;
 
//for TotalCoeff > 3
reg		[0:5]	rbsp_G3;  		
reg		[3:0]	TotalZeros_G3;
reg		[2:0]	len_G3;
 
 
//----------------------------------------
//input mux
//----------------------------------------
always @(*)
if (ena && sel && chroma_DC_sel) begin
	rbsp_chroma_DC	<= rbsp[0:2];
	rbsp_LE3		<= 'hffff;
	rbsp_G3			<= 'hffff;
end
else if (ena && sel && TotalCoeff[3:2] == 2'b00) begin
	rbsp_chroma_DC	<= 'hffff;
	rbsp_LE3		<= rbsp[0:8];
	rbsp_G3			<= 'hffff;
end
else if (ena && sel)begin
	rbsp_chroma_DC	<= 'hffff;
	rbsp_LE3		<= 'hffff;
	rbsp_G3			<= rbsp[0:5];
end
else begin
	rbsp_chroma_DC	<= 'hffff;
	rbsp_LE3		<= 'hffff;
	rbsp_G3			<= 'hffff;
end
 
//----------------------------------------
//TotalZeros_chroma_DC & len_chroma_DC
//----------------------------------------
always @(*)
if ( TotalCoeff == 1 && rbsp_chroma_DC[0] ) begin
	TotalZeros_chroma_DC	<= 0;
	len_chroma_DC			<= 1;
end
else if ( TotalCoeff == 1 && rbsp_chroma_DC[1] ) begin
	TotalZeros_chroma_DC	<= 1;
	len_chroma_DC			<= 2;
end
else if ( TotalCoeff == 1 && rbsp_chroma_DC[2] ) begin
	TotalZeros_chroma_DC	<= 2;
	len_chroma_DC			<= 3;
end
else if ( TotalCoeff == 1 ) begin
	TotalZeros_chroma_DC	<= 3;
	len_chroma_DC			<= 3;
end
else if ( TotalCoeff == 2 && rbsp_chroma_DC[0] ) begin
	TotalZeros_chroma_DC	<= 0;
	len_chroma_DC			<= 1;
end
else if ( TotalCoeff == 2 && rbsp_chroma_DC[1] ) begin
	TotalZeros_chroma_DC	<= 1;
	len_chroma_DC			<= 2;
end
else if ( TotalCoeff == 2 ) begin
	TotalZeros_chroma_DC	<= 2;
	len_chroma_DC			<= 2;
end
else if ( rbsp_chroma_DC[0] ) begin
	TotalZeros_chroma_DC	<= 0;
	len_chroma_DC			<= 1;
end
else begin
	TotalZeros_chroma_DC	<= 1;
	len_chroma_DC			<= 1;
end
 
 
//---------------------------------
//TotalZeros_LE3 & len_LE3
//---------------------------------
always @(rbsp_LE3 or TotalCoeff)
case (TotalCoeff[1:0])
1 :begin
	case(1'b1)
	rbsp_LE3[0] : begin
		TotalZeros_LE3	<= 0;
		len_LE3			<= 1;	
	end
	rbsp_LE3[1] : begin
		len_LE3			<= 3;
		if (rbsp_LE3[2])
			TotalZeros_LE3	<= 1;
		else
			TotalZeros_LE3	<= 2;
	end
	rbsp_LE3[2] : begin
		len_LE3			<= 4;
		if (rbsp_LE3[3])
			TotalZeros_LE3	<= 3;
		else
			TotalZeros_LE3	<= 4;
	end
	rbsp_LE3[3] : begin
		len_LE3			<= 5;
		if (rbsp_LE3[4])
			TotalZeros_LE3	<= 5;
		else
			TotalZeros_LE3	<= 6;
	end
	rbsp_LE3[4] : begin
		len_LE3			<= 6;
		if (rbsp_LE3[5])
			TotalZeros_LE3	<= 7;
		else
			TotalZeros_LE3	<= 8;
	end
	rbsp_LE3[5] : begin
		len_LE3			<= 7;
		if (rbsp_LE3[6])
			TotalZeros_LE3	<= 9;
		else
			TotalZeros_LE3	<= 10;
	end
	rbsp_LE3[6] : begin
		len_LE3			<= 8;
		if (rbsp_LE3[7])
			TotalZeros_LE3	<= 11;
		else
			TotalZeros_LE3	<= 12;
	end
	rbsp_LE3[7] : begin
		len_LE3			<= 9;
		if (rbsp_LE3[8])
			TotalZeros_LE3	<= 13;
		else
			TotalZeros_LE3	<= 14;
	end
	default : begin
		len_LE3			<= 9;
		TotalZeros_LE3	<= 15;
	end
	endcase
end
2 : begin
	case(1'b1)
	rbsp_LE3[0] : begin
		len_LE3	<= 3;
		case(rbsp_LE3[1:2])
		'b11 :	TotalZeros_LE3	<= 0;
		'b10 :	TotalZeros_LE3	<= 1;
		'b01 :	TotalZeros_LE3	<= 2;
		'b00 :	TotalZeros_LE3	<= 3;
		endcase
	end
	rbsp_LE3[1] : begin
		if (rbsp_LE3[2]) begin
			TotalZeros_LE3	<= 4;
			len_LE3			<= 3;
		end
		else begin
			len_LE3			<= 4;
			if (rbsp_LE3[3])
				TotalZeros_LE3	<= 5;
			else
				TotalZeros_LE3	<= 6;
		end
	end
	rbsp_LE3[2] : begin
		len_LE3			<= 4;
		if (rbsp_LE3[3])
			TotalZeros_LE3	<= 7;
		else
			TotalZeros_LE3	<= 8;
	end
	rbsp_LE3[3] : begin
		len_LE3			<= 5;
		if (rbsp_LE3[4])
			TotalZeros_LE3	<= 9;
		else
			TotalZeros_LE3	<= 10;
	end
	default : begin
		len_LE3	<= 6;
		case(rbsp_LE3[4:5])
		'b11 :	TotalZeros_LE3	<= 11;
		'b10 :	TotalZeros_LE3	<= 12;
		'b01 :	TotalZeros_LE3	<= 13;
		'b00 :	TotalZeros_LE3	<= 14;
		endcase
	end
	endcase
end
3 : begin
	case(1'b1)
	rbsp_LE3[0] : begin
		len_LE3	<= 3;
		case(rbsp_LE3[1:2])
		'b11 :	TotalZeros_LE3	<= 1;
		'b10 :	TotalZeros_LE3	<= 2;
		'b01 :	TotalZeros_LE3	<= 3;
		'b00 :	TotalZeros_LE3	<= 6;
		endcase
	end
	rbsp_LE3[1] : begin
		if (rbsp_LE3[2]) begin
			TotalZeros_LE3	<= 7;
			len_LE3			<= 3;
		end
		else begin
			len_LE3			<= 4;
			if (rbsp_LE3[3])
				TotalZeros_LE3	<= 0;
			else
				TotalZeros_LE3	<= 4;
		end
	end
	rbsp_LE3[2] : begin
		len_LE3			<= 4;
		if (rbsp_LE3[3])
			TotalZeros_LE3	<= 5;
		else
			TotalZeros_LE3	<= 8;
	end
	rbsp_LE3[3] : begin
		len_LE3			<= 5;
		if (rbsp_LE3[4])
			TotalZeros_LE3	<= 9;
		else
			TotalZeros_LE3	<= 10;
	end
	rbsp_LE3[4] : begin
		len_LE3			<= 5;
		TotalZeros_LE3	<= 12;
	end
	default : begin
		len_LE3	<= 6;
		if(rbsp_LE3[5])
			TotalZeros_LE3	<= 11;
		else
			TotalZeros_LE3	<= 13;		
	end
	endcase
end
default	: begin
	len_LE3			<= 'bx;
	TotalZeros_LE3	<= 'bx;
end
endcase
 
//---------------------------------
//TotalZeros_G3 & len_G3
//---------------------------------
always @(rbsp_G3 or TotalCoeff)
case (TotalCoeff)
4 : begin
	case(1'b1)
	rbsp_G3[0] : begin
		len_G3	<= 3;
		case(rbsp_G3[1:2])
		'b11 :	TotalZeros_G3	<= 1;
		'b10 :	TotalZeros_G3	<= 4;
		'b01 :	TotalZeros_G3	<= 5;
		'b00 :	TotalZeros_G3	<= 6;
		endcase
	end
	rbsp_G3[1] : begin
		if (rbsp_G3[2]) begin
			TotalZeros_G3	<= 8;
			len_G3			<= 3;
		end
		else begin
			len_G3			<= 4;
			if (rbsp_G3[3])
				TotalZeros_G3	<= 2;
			else
				TotalZeros_G3	<= 3;
		end
	end
	rbsp_G3[2] : begin
		len_G3			<= 4;
		if (rbsp_G3[3])
			TotalZeros_G3	<= 7;
		else
			TotalZeros_G3	<= 9;
	end
	default : begin
		len_G3	<= 5;
		case(rbsp_G3[3:4])
		'b11 :	TotalZeros_G3	<= 0;
		'b10 :	TotalZeros_G3	<= 10;
		'b01 :	TotalZeros_G3	<= 11;
		'b00 :	TotalZeros_G3	<= 12;
		endcase
	end
	endcase
end
5 :begin
	case(1'b1)
	rbsp_G3[0] : begin
		len_G3	<= 3;
		case(rbsp_G3[1:2])
		'b11 :	TotalZeros_G3	<= 3;
		'b10 :	TotalZeros_G3	<= 4;
		'b01 :	TotalZeros_G3	<= 5;
		'b00 :	TotalZeros_G3	<= 6;
		endcase
	end
	rbsp_G3[1] : begin
		if (rbsp_G3[2]) begin
			TotalZeros_G3	<= 7;
			len_G3			<= 3;
		end
		else begin
			len_G3			<= 4;
			if (rbsp_G3[3])
				TotalZeros_G3	<= 0;
			else
				TotalZeros_G3	<= 1;
		end
	end
	rbsp_G3[2] : begin
		len_G3			<= 4;
		if (rbsp_G3[3])
			TotalZeros_G3	<= 2;
		else
			TotalZeros_G3	<= 8;
	end
	rbsp_G3[3] : begin
		len_G3			<= 4;
		TotalZeros_G3	<= 10;
	end
	default : begin
		len_G3	<= 5;
		if (rbsp_G3[4])
			TotalZeros_G3	<= 9;
		else
			TotalZeros_G3	<= 11;
	end
	endcase
end
6 : begin
	case(1'b1)
	rbsp_G3[0] : begin
		len_G3	<= 3;
		case(rbsp_G3[1:2])
		'b11 :	TotalZeros_G3	<= 2;
		'b10 :	TotalZeros_G3	<= 3;
		'b01 :	TotalZeros_G3	<= 4;
		'b00 :	TotalZeros_G3	<= 5;
		endcase
	end
	rbsp_G3[1] : begin
		len_G3			<= 3;
		if (rbsp_G3[2])
			TotalZeros_G3	<= 6;
		else
			TotalZeros_G3	<= 7;
	end
	rbsp_G3[2] : begin
		len_G3			<= 3;
		TotalZeros_G3	<= 9;
	end
	rbsp_G3[3] : begin
		len_G3			<= 4;
		TotalZeros_G3	<= 8;
	end
	rbsp_G3[4] : begin
		len_G3			<= 5;
		TotalZeros_G3	<= 1;
	end
	default : begin
		len_G3	<= 6;
		if (rbsp_G3[5])
			TotalZeros_G3	<= 0;
		else
			TotalZeros_G3	<= 10;
	end
	endcase
end
7 :begin
	case(1'b1)
	rbsp_G3[0] : begin
		if (rbsp_G3[1]) begin
			TotalZeros_G3	<= 5;
			len_G3			<= 2;
		end
		else begin
			len_G3			<= 3;
			if (rbsp_G3[2])
				TotalZeros_G3	<= 2;
			else
				TotalZeros_G3	<= 3;
		end
	end
	rbsp_G3[1] : begin
		len_G3	<= 3;
		if (rbsp_G3[2])
			TotalZeros_G3	<= 4;
		else
			TotalZeros_G3	<= 6;
	end
	rbsp_G3[2] : begin
		len_G3			<= 3;
		TotalZeros_G3	<= 8;
	end
	rbsp_G3[3] : begin
		len_G3			<= 4;
		TotalZeros_G3	<= 7;
	end
	rbsp_G3[4] : begin
		len_G3			<= 5;
		TotalZeros_G3	<= 1;
	end
	default : begin
		len_G3			<= 6;
		if (rbsp_G3[5])
			TotalZeros_G3	<= 0;
		else
			TotalZeros_G3	<= 9;
	end
	endcase
end
8 :begin
	case(1'b1)
	rbsp_G3[0] : begin
		len_G3			<= 2;
		if (rbsp_G3[1]) 
			TotalZeros_G3	<= 4;
		else 
			TotalZeros_G3	<= 5;
	end
	rbsp_G3[1] : begin
		len_G3			<= 3;
		if (rbsp_G3[2]) 
			TotalZeros_G3	<= 3;
		else 
			TotalZeros_G3	<= 6;
	end
	rbsp_G3[2] : begin
		len_G3			<= 3;
		TotalZeros_G3	<= 7;
	end
	rbsp_G3[3] : begin
		len_G3			<= 4;
		TotalZeros_G3	<= 1;
	end
	rbsp_G3[4] : begin
		len_G3			<= 5;
		TotalZeros_G3	<= 2;
	end
	default : begin
		len_G3			<= 6;
		if (rbsp_G3[5])
			TotalZeros_G3	<= 0;
		else
			TotalZeros_G3	<= 8;
	end
	endcase
end
9 : begin
	case(1'b1)
	rbsp_G3[0] : begin
		len_G3			<= 2;
		if (rbsp_G3[1]) 
			TotalZeros_G3	<= 3;
		else 
			TotalZeros_G3	<= 4;
	end
	rbsp_G3[1] : begin
		len_G3			<= 2;
		TotalZeros_G3	<= 6;
	end
	rbsp_G3[2] : begin
		len_G3			<= 3;
		TotalZeros_G3	<= 5;
	end
	rbsp_G3[3] : begin
		len_G3			<= 4;
		TotalZeros_G3	<= 2;
	end
	rbsp_G3[4] : begin
		len_G3			<= 5;
		TotalZeros_G3	<= 7;
	end
	default : begin
		len_G3			<= 6;
		if (rbsp_G3[5])
			TotalZeros_G3	<= 0;
		else
			TotalZeros_G3	<= 1;
	end
	endcase
end
10 : begin
	case(1'b1)
	rbsp_G3[0] : begin
		len_G3			<= 2;
		if (rbsp_G3[1]) 
			TotalZeros_G3	<= 3;
		else 
			TotalZeros_G3	<= 4;
	end
	rbsp_G3[1] : begin
		len_G3			<= 2;
		TotalZeros_G3	<= 5;
	end
	rbsp_G3[2] : begin
		len_G3			<= 3;
		TotalZeros_G3	<= 2;
	end
	rbsp_G3[3] : begin
		len_G3			<= 4;
		TotalZeros_G3	<= 6;
	end
	default : begin
		len_G3			<= 5;
		if (rbsp_G3[4])
			TotalZeros_G3	<= 0;
		else
			TotalZeros_G3	<= 1;
	end
	endcase
end
11 : begin
	case(1'b1)
	rbsp_G3[0] : begin
		len_G3			<= 1;
		TotalZeros_G3	<= 4;
	end
	rbsp_G3[1] : begin
		len_G3			<= 3;
		if (rbsp_G3[2]) 
			TotalZeros_G3	<= 5;
		else 
			TotalZeros_G3	<= 3;
	end
	rbsp_G3[2] : begin
		len_G3			<= 3;
		TotalZeros_G3	<= 2;
	end
	default : begin
		len_G3			<= 4;
		if (rbsp_G3[3])
			TotalZeros_G3	<= 1;
		else
			TotalZeros_G3	<= 0;
	end
	endcase
end
12 : begin
	case(1'b1)
	rbsp_G3[0] : begin
		len_G3			<= 1;
		TotalZeros_G3	<= 3;
	end
	rbsp_G3[1] : begin
		len_G3			<= 2;
		TotalZeros_G3	<= 2;
	end
	rbsp_G3[2] : begin
		len_G3			<= 3;
		TotalZeros_G3	<= 4;
	end
	default : begin
		len_G3			<= 4;
		if (rbsp_G3[3])
			TotalZeros_G3	<= 1;
		else
			TotalZeros_G3	<= 0;
	end
	endcase
end
13	:begin
	if (rbsp_G3[0]) begin
		TotalZeros_G3	<= 2;
		len_G3			<= 1;		
	end
	else if (rbsp_G3[1]) begin
		TotalZeros_G3	<= 3;
		len_G3			<= 2;	
	end
	else if (rbsp_G3[2]) begin
		TotalZeros_G3	<= 1;
		len_G3			<= 3;	
	end
	else begin
		TotalZeros_G3	<= 0;
		len_G3			<= 3;		
	end
end
14	: begin
	if (rbsp_G3[0]) begin
		TotalZeros_G3	<= 2;
		len_G3			<= 1;		
	end
	else if (rbsp_G3[1]) begin
		TotalZeros_G3	<= 1;
		len_G3			<= 2;	
	end
	else begin
		TotalZeros_G3	<= 0;
		len_G3			<= 2;		
	end
end
15	: begin
	len_G3	<= 1;
	if (rbsp_G3[0])
		TotalZeros_G3	<= 1;
	else
		TotalZeros_G3	<= 0;
end
default	: begin
	len_G3			<= 'bx;
	TotalZeros_G3	<= 'bx;
end
endcase
 
//---------------------------------
//TotalZeros_comb & len_comb
//---------------------------------
always @(*)
if (ena && sel && chroma_DC_sel) begin
	TotalZeros_comb 	<= TotalZeros_chroma_DC;
	len_comb			<= len_chroma_DC;
end
else if (ena && sel && TotalCoeff[3:2] == 2'b00) begin
	TotalZeros_comb 	<= TotalZeros_LE3;
	len_comb			<= len_LE3;
end
else if (ena && sel)begin
	TotalZeros_comb 	<= TotalZeros_G3;
	len_comb			<= len_G3;
end
else begin
	TotalZeros_comb 	<= 0;
	len_comb			<= 0;
end
 
 
endmodule
 

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