Subversion Repositories cavlc

//2011-8-16 initiial revision
 
`include "defines.v"
 
module cavlc_read_run_befores(
	clk,
	rst_n,
	ena,
	sel,
	clr,
	ZeroLeft_init,
 
	rbsp,
	i,
	TotalZeros_comb,
 
	level_0,
	level_1,
	level_2,
	level_3,
	level_4,
	level_5,
	level_6,
	level_7,
	level_8,
	level_9,
	level_10,
	level_11,
	level_12,
	level_13,
	level_14,
	level_15,
 
	coeff_0,
	coeff_1,
	coeff_2,
	coeff_3,
	coeff_4,
	coeff_5,
	coeff_6,
	coeff_7,
	coeff_8,
	coeff_9,
	coeff_10,
	coeff_11,
	coeff_12,
	coeff_13,
	coeff_14,
	coeff_15,
	ZeroLeft,
	len_comb
);	
//----------------------
//ports
//----------------------
input	clk;
input	rst_n;
input	ena;
input	sel;
input	clr;
input	ZeroLeft_init;
 
input	[0:10]	rbsp;
input	[3:0]	i;			//range from TotalCoeff-1 to 0
input	[3:0]	TotalZeros_comb;
 
input	[8:0]	level_0;
input	[8:0]	level_1;
input	[8:0]	level_2;
input	[8:0]	level_3;
input	[8:0]	level_4;
input	[8:0]	level_5;
input	[8:0]	level_6;
input	[8:0]	level_7;
input	[8:0]	level_8;
input	[8:0]	level_9;
input	[8:0]	level_10;
input	[8:0]	level_11;
input	[8:0]	level_12;
input	[8:0]	level_13;
input	[8:0]	level_14;
input	[8:0]	level_15;
 
output	[8:0]	coeff_0;
output	[8:0]	coeff_1;
output	[8:0]	coeff_2;
output	[8:0]	coeff_3;
output	[8:0]	coeff_4;
output	[8:0]	coeff_5;
output	[8:0]	coeff_6;
output	[8:0]	coeff_7;
output	[8:0]	coeff_8;
output	[8:0]	coeff_9;
output	[8:0]	coeff_10;
output	[8:0]	coeff_11;
output	[8:0]	coeff_12;
output	[8:0]	coeff_13;
output	[8:0]	coeff_14;
output	[8:0]	coeff_15;
 
output	[3:0]	ZeroLeft;
 
output	[3:0]	len_comb;
 
//----------------------
//regs
//----------------------
reg		[3:0]	run;
reg		[3:0]	len;
reg		[8:0]	coeff;
 
 
reg		[3:0]	len_comb;
 
//----------------------
//FFs
//----------------------
reg		[3:0]	ZeroLeft;
 
reg  	[8:0]	coeff_0;
reg  	[8:0]	coeff_1;
reg  	[8:0]	coeff_2;
reg  	[8:0]	coeff_3;
reg  	[8:0]	coeff_4;
reg  	[8:0]	coeff_5;
reg  	[8:0]	coeff_6;
reg  	[8:0]	coeff_7;
reg  	[8:0]	coeff_8;
reg  	[8:0]	coeff_9;
reg  	[8:0]	coeff_10;
reg  	[8:0]	coeff_11;
reg  	[8:0]	coeff_12;
reg  	[8:0]	coeff_13;
reg  	[8:0]	coeff_14;
reg  	[8:0]	coeff_15;
 
//----------------------
//run & len
//----------------------
always @(rbsp or ZeroLeft or ena or sel)
if (ena && sel)
case(ZeroLeft)
	0 : begin len <= 0; run <= 0; end
	1 : begin len <= 1; run <= rbsp[0]? 0:1; end
	2 : begin if (rbsp[0]) begin
			run <= 0;
			len <= 1;
		end
		else if (rbsp[1]) begin
			run <= 1;
			len <= 2;
		end	
		else begin
			run <= 2;
			len <= 2;
		end
	end
	3 : begin
		run <= 3 - rbsp[0:1];
		len <= 2;
	end
	4 : begin
		if (rbsp[0:1] != 0) begin
			run <= 3 - rbsp[0:1];
			len <= 2;
		end
		else begin
			run <= rbsp[2]? 3:4;
			len <= 3;
		end
	end
	5 : begin
		if (rbsp[0]) begin
			run <= rbsp[1]? 0:1;
			len <= 2;
		end
		else if (rbsp[1]) begin
			run <= rbsp[2]? 2:3;
			len <= 3;
		end		
		else begin
			run <= rbsp[2]? 4:5;
			len <= 3;		
		end
	end
	6 : begin
		if (rbsp[0:1] == 2'b11) begin
			run <= 0;
			len <= 2;
		end
		else begin
			len <= 3;
			case(rbsp[0:2])
				3'b000 : run <= 1;
				3'b001 : run <= 2;
				3'b011 : run <= 3;
				3'b010 : run <= 4;
				3'b101 : run <= 5;
				default: run <= 6;
			endcase
		end		
	end
	default : begin
		if (rbsp[0:2] != 0) begin
			run <= 7 - rbsp[0:2];
			len <= 3;
		end
		else begin
			case (1'b1)
				rbsp[3] : begin run <= 7;	len <= 4; end
				rbsp[4] : begin run <= 8;	len <= 5; end
				rbsp[5] : begin run <= 9;	len <= 6; end
				rbsp[6] : begin run <= 10;	len <= 7; end
				rbsp[7] : begin run <= 11;	len <= 8; end
				rbsp[8] : begin run <= 12;	len <= 9; end
				rbsp[9] : begin run <= 13;	len <= 10;end
				rbsp[10]: begin run <= 14;	len <= 11;end
				default : begin run <= 'bx;	len <='bx;end
			endcase
		end
	end
endcase
else begin
	len <= 0;
	run <= 0;
end
 
//----------------------
//len_comb
//----------------------
always @(*)
if (i >  0)
	len_comb <= len;
else
	len_comb <= 0;
 
 
//----------------------
//ZeroLeft
//----------------------
always @(posedge clk or negedge rst_n)
if (!rst_n)
	ZeroLeft <= 0;
else if (ena && clr)	//in case TotalCoeff >= max_coeff_num
	ZeroLeft <= 0;
else if (ena && ZeroLeft_init)
	ZeroLeft <= TotalZeros_comb;
else if (ena && sel )//if ZeroLeft == 0, run will be 0
	ZeroLeft <= ZeroLeft - run; 
 
//----------------------
//coeff
//----------------------
always @(*)
if (ena && sel)
case (i)
	0 :coeff <= level_0;
	1 :coeff <= level_1;
	2 :coeff <= level_2;
	3 :coeff <= level_3;
	4 :coeff <= level_4;
	5 :coeff <= level_5;	
	6 :coeff <= level_6;
	7 :coeff <= level_7;
	8 :coeff <= level_8;
	9 :coeff <= level_9;
	10:coeff <= level_10;
	11:coeff <= level_11;		
	12:coeff <= level_12;
	13:coeff <= level_13;
	14:coeff <= level_14;
	15:coeff <= level_15;
endcase
else
	coeff <= 0;
 
//----------------------
//coeff_0 to coeff_15
//----------------------
always @(posedge clk or negedge rst_n)
if (!rst_n) begin
	coeff_0 <= 0;	coeff_1 <= 0;	coeff_2 <= 0;	coeff_3 <= 0;
	coeff_4 <= 0;	coeff_5 <= 0;	coeff_6 <= 0;	coeff_7 <= 0;
	coeff_8 <= 0;	coeff_9 <= 0;	coeff_10<= 0;	coeff_11<= 0;
	coeff_12<= 0;	coeff_13<= 0;	coeff_14<= 0;	coeff_15<= 0;
end
else if (ena && clr) begin
	coeff_0 <= 0;	coeff_1 <= 0;	coeff_2 <= 0;	coeff_3 <= 0;
	coeff_4 <= 0;	coeff_5 <= 0;	coeff_6 <= 0;	coeff_7 <= 0;
	coeff_8 <= 0;	coeff_9 <= 0;	coeff_10<= 0;	coeff_11<= 0;
	coeff_12<= 0;	coeff_13<= 0;	coeff_14<= 0;	coeff_15<= 0;
end
else if (ena && sel && ZeroLeft > 0)
case (ZeroLeft+i)
	1 :coeff_1	<= coeff;
	2 :coeff_2	<= coeff;
	3 :coeff_3	<= coeff;
	4 :coeff_4	<= coeff;
	5 :coeff_5	<= coeff;
	6 :coeff_6	<= coeff;
	7 :coeff_7	<= coeff;
	8 :coeff_8	<= coeff;
	9 :coeff_9	<= coeff;
	10:coeff_10	<= coeff;
	11:coeff_11	<= coeff;
	12:coeff_12	<= coeff;
	13:coeff_13	<= coeff;
	14:coeff_14	<= coeff;
	default:
	coeff_15	<= coeff;
endcase
else if (ena && sel) begin
	if (i >= 0)	coeff_0  <= level_0;
	if (i >= 1)	coeff_1  <= level_1;
	if (i >= 2) coeff_2  <= level_2;
	if (i >= 3) coeff_3  <= level_3;
	if (i >= 4) coeff_4  <= level_4;
	if (i >= 5) coeff_5  <= level_5;
	if (i >= 6) coeff_6  <= level_6;
	if (i >= 7) coeff_7  <= level_7;
	if (i >= 8) coeff_8  <= level_8;
	if (i >= 9) coeff_9  <= level_9;
	if (i >= 10)coeff_10 <= level_10;
	if (i >= 11)coeff_11 <= level_11;
	if (i >= 12)coeff_12 <= level_12;
	if (i >= 13)coeff_13 <= level_13;
	if (i >= 14)coeff_14 <= level_14;
	if (i == 15)coeff_15 <= level_15;
end
endmodule