df_reg_ctrl.v

a H.264/AVC Baseline Decoder

//--------------------------------------------------------------------------------------------------
// Design    : nova
// Author(s) : Ke Xu
// Email	   : [e-mail]
// File      : DF_reg_ctrl.v
// Generated : Nov 27,2005
// Copyright (C) 2008 Ke Xu                
//-------------------------------------------------------------------------------------------------
// Description 
// buffer buf0 ~ buf3 & transpose reg t0 ~ t1 control
//-------------------------------------------------------------------------------------------------

// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "nova_defines.v"

module DF_reg_ctrl (gclk_DF,reset_n,DF_edge_counter_MW,one_edge_counter_MW,
	mb_num_h_DF,mb_num_v_DF,q0_MW,q1_MW,q2_MW,q3_MW,p0_MW,p1_MW,p2_MW,p3_MW,
	buf0_0,buf0_1,buf0_2,buf0_3,buf1_0,buf1_1,buf1_2,buf1_3,
	buf2_0,buf2_1,buf2_2,buf2_3,buf3_0,buf3_1,buf3_2,buf3_3,
	t0_0,t0_1,t0_2,t0_3,t1_0,t1_1,t1_2,t1_3,t2_0,t2_1,t2_2,t2_3);
	input gclk_DF,reset_n;
	input [5:0] DF_edge_counter_MW;
	input [1:0] one_edge_counter_MW;
	input [3:0] mb_num_h_DF;
	input [3:0] mb_num_v_DF;
	input [7:0] q0_MW,q1_MW,q2_MW,q3_MW;
	input [7:0] p0_MW,p1_MW,p2_MW,p3_MW;
	
	output [31:0] buf0_0,buf0_1,buf0_2,buf0_3;
	output [31:0] buf1_0,buf1_1,buf1_2,buf1_3;
	output [31:0] buf2_0,buf2_1,buf2_2,buf2_3;
	output [31:0] buf3_0,buf3_1,buf3_2,buf3_3;
	output [31:0] t0_0,t0_1,t0_2,t0_3;
	output [31:0] t1_0,t1_1,t1_2,t1_3;
	output [31:0] t2_0,t2_1,t2_2,t2_3;
	
	reg [31:0] buf0_0,buf0_1,buf0_2,buf0_3;
	reg [31:0] buf1_0,buf1_1,buf1_2,buf1_3;
	reg [31:0] buf2_0,buf2_1,buf2_2,buf2_3;
	reg [31:0] buf3_0,buf3_1,buf3_2,buf3_3;
	reg [31:0] t0_0,t0_1,t0_2,t0_3;
	reg [31:0] t1_0,t1_1,t1_2,t1_3;
	reg [31:0] t2_0,t2_1,t2_2,t2_3;
	//------------------------------------------------------
	//buf0
	//------------------------------------------------------
	wire buf0_no_transpose;	//buf0 updated without transpose
	wire buf0_transpose;		//buf0 updated after   transpose
	assign buf0_no_transpose = (
		DF_edge_counter_MW == 6'd0  || DF_edge_counter_MW == 6'd4  || DF_edge_counter_MW == 6'd6  ||
		DF_edge_counter_MW == 6'd12 || DF_edge_counter_MW == 6'd16 || DF_edge_counter_MW == 6'd20 ||
		DF_edge_counter_MW == 6'd22 || DF_edge_counter_MW == 6'd28 || DF_edge_counter_MW == 6'd32 ||
		DF_edge_counter_MW == 6'd36 || DF_edge_counter_MW == 6'd40 || DF_edge_counter_MW == 6'd44);
	assign buf0_transpose = (
		DF_edge_counter_MW == 6'd1  || DF_edge_counter_MW == 6'd5  || DF_edge_counter_MW == 6'd10 ||
		DF_edge_counter_MW == 6'd14 || DF_edge_counter_MW == 6'd17 || DF_edge_counter_MW == 6'd26 ||
		DF_edge_counter_MW == 6'd30 || DF_edge_counter_MW == 6'd33 || DF_edge_counter_MW == 6'd38 ||
		DF_edge_counter_MW == 6'd41 || DF_edge_counter_MW == 6'd46);
		
	always @ (posedge gclk_DF or negedge reset_n)
		if (reset_n == 1'b0)
			begin 
				buf0_0 <= 0;	buf0_1 <= 0;	buf0_2 <= 0;	buf0_3 <= 0;
			end
		//no transpose update,always "q" position (right or down of the edge to be filtered)
		else if (buf0_no_transpose)
			case (one_edge_counter_MW)
				2'd0:buf0_0 <= {q3_MW,q2_MW,q1_MW,q0_MW};
				2'd1:buf0_1 <= {q3_MW,q2_MW,q1_MW,q0_MW};
				2'd2:buf0_2 <= {q3_MW,q2_MW,q1_MW,q0_MW};
				2'd3:buf0_3 <= {q3_MW,q2_MW,q1_MW,q0_MW};
			endcase
		//transpose update,always "p" position (left or up of the edge to be filtered)
		else if (buf0_transpose)
			case (one_edge_counter_MW)
				2'd0:begin	buf0_0[7:0]   <= p3_MW;	buf0_1[7:0]   <= p2_MW;
							buf0_2[7:0]   <= p1_MW;	buf0_3[7:0]   <= p0_MW;	end
				2'd1:begin	buf0_0[15:8]  <= p3_MW;	buf0_1[15:8]  <= p2_MW;
							buf0_2[15:8]  <= p1_MW;	buf0_3[15:8]  <= p0_MW;	end
				2'd2:begin	buf0_0[23:16] <= p3_MW;	buf0_1[23:16] <= p2_MW;
							buf0_2[23:16] <= p1_MW;	buf0_3[23:16] <= p0_MW;	end
				2'd3:begin	buf0_0[31:24] <= p3_MW;	buf0_1[31:24] <= p2_MW;
							buf0_2[31:24] <= p1_MW;	buf0_3[31:24] <= p0_MW;	end
			endcase	
	//------------------------------------------------------
	//buf1
	//------------------------------------------------------
	wire buf1_no_transpose;	//buf1 updated without transpose
	wire buf1_transpose;		//buf1 updated after   transpose
	wire buf1_transpose_p;	//buf1 transpose and buf1 stores "p" position pixels
	assign buf1_no_transpose = ( 
		DF_edge_counter_MW == 6'd1  || DF_edge_counter_MW == 6'd8  || DF_edge_counter_MW == 6'd13 ||
		DF_edge_counter_MW == 6'd17 || DF_edge_counter_MW == 6'd24 || DF_edge_counter_MW == 6'd29 ||
		DF_edge_counter_MW == 6'd37 || DF_edge_counter_MW == 6'd45);
	assign buf1_transpose = (
		DF_edge_counter_MW == 6'd6  || DF_edge_counter_MW == 6'd10 || DF_edge_counter_MW == 6'd22 || 
		DF_edge_counter_MW == 6'd26 || DF_edge_counter_MW == 6'd33 || DF_edge_counter_MW == 6'd41);
	assign buf1_transpose_p = (DF_edge_counter_MW == 6'd6  || DF_edge_counter_MW == 6'd9  
							|| DF_edge_counter_MW == 6'd22);
	always @ (posedge gclk_DF or negedge reset_n)
		if (reset_n == 1'b0)
			begin 
				buf1_0 <= 0;	buf1_1 <= 0;	buf1_2 <= 0;	buf1_3 <= 0;
			end
		//no transpose update,always "q" position (right or down of the edge to be filtered)
		else if (buf1_no_transpose)
			case (one_edge_counter_MW)
				2'd0:buf1_0 <= {q3_MW,q2_MW,q1_MW,q0_MW};
				2'd1:buf1_1 <= {q3_MW,q2_MW,q1_MW,q0_MW};
				2'd2:buf1_2 <= {q3_MW,q2_MW,q1_MW,q0_MW};
				2'd3:buf1_3 <= {q3_MW,q2_MW,q1_MW,q0_MW};
			endcase
		//transpose update,"p":6/9/22,"q":10,26,33,41
		else if (buf1_transpose)
			begin 
				if (buf1_transpose_p)	// edge 6,22  "p"
					case (one_edge_counter_MW)
						2'd0:begin	buf1_0[7:0]   <= p3_MW;	buf1_1[7:0]   <= p2_MW;
									buf1_2[7:0]   <= p1_MW;	buf1_3[7:0]   <= p0_MW;	end
						2'd1:begin	buf1_0[15:8]  <= p3_MW;	buf1_1[15:8]  <= p2_MW;
									buf1_2[15:8]  <= p1_MW;	buf1_3[15:8]  <= p0_MW;	end
						2'd2:begin	buf1_0[23:16] <= p3_MW;	buf1_1[23:16] <= p2_MW;
									buf1_2[23:16] <= p1_MW;	buf1_3[23:16] <= p0_MW;	end
						2'd3:begin	buf1_0[31:24] <= p3_MW;	buf1_1[31:24] <= p2_MW;
									buf1_2[31:24] <= p1_MW;	buf1_3[31:24] <= p0_MW;	end
					endcase
				else					//edge 10,26,33,41  "q"
					case (one_edge_counter_MW)
						2'd0:begin	buf1_0[7:0]   <= q0_MW;	buf1_1[7:0]   <= q1_MW;
									buf1_2[7:0]   <= q2_MW;	buf1_3[7:0]   <= q3_MW;	end
						2'd1:begin	buf1_0[15:8]  <= q0_MW;	buf1_1[15:8]  <= q1_MW;
									buf1_2[15:8]  <= q2_MW;	buf1_3[15:8]  <= q3_MW;	end
						2'd2:begin	buf1_0[23:16] <= q0_MW;	buf1_1[23:16] <= q1_MW;
									buf1_2[23:16] <= q2_MW;	buf1_3[23:16] <= q3_MW;	end
						2'd3:begin	buf1_0[31:24] <= q0_MW;	buf1_1[31:24] <= q1_MW;
									buf1_2[31:24] <= q2_MW;	buf1_3[31:24] <= q3_MW;	end
					endcase
			end
	//------------------------------------------------------
	//buf2
	//------------------------------------------------------
	wire buf2_no_transpose;	//buf2 updated without transpose
	wire buf2_transpose;		//buf2 updated after   transpose
	wire buf2_transpose_p;	//buf2 transpose and buf2 stores "p" position pixels
	assign buf2_no_transpose = ( 
		DF_edge_counter_MW == 6'd2  || DF_edge_counter_MW == 6'd7  || DF_edge_counter_MW == 6'd18 ||
		DF_edge_counter_MW == 6'd23 || DF_edge_counter_MW == 6'd34 || DF_edge_counter_MW == 6'd42);
	assign buf2_transpose = (
		DF_edge_counter_MW == 6'd3  || DF_edge_counter_MW == 6'd11 || DF_edge_counter_MW == 6'd19 ||
		DF_edge_counter_MW == 6'd21 || DF_edge_counter_MW == 6'd27 || DF_edge_counter_MW == 6'd30 ||
		DF_edge_counter_MW == 6'd35 || DF_edge_counter_MW == 6'd38 || DF_edge_counter_MW == 6'd43 ||
		DF_edge_counter_MW == 6'd46);
	assign buf2_transpose_p = (DF_edge_counter_MW == 6'd3  || DF_edge_counter_MW == 6'd11  
							|| DF_edge_counter_MW == 6'd19 || DF_edge_counter_MW == 6'd27
							|| DF_edge_counter_MW == 6'd35 || DF_edge_counter_MW == 6'd43);
	always @ (posedge gclk_DF or negedge reset_n)
		if (reset_n == 1'b0)
			begin 
				buf2_0 <= 0;	buf2_1 <= 0;	buf2_2 <= 0;	buf2_3 <= 0;
			end
		//no transpose update,always "q" position (right or down of the edge to be filtered)
		else if (buf2_no_transpose)
			case (one_edge_counter_MW)
				2'd0:buf2_0 <= {q3_MW,q2_MW,q1_MW,q0_MW};
				2'd1:buf2_1 <= {q3_MW,q2_MW,q1_MW,q0_MW};
				2'd2:buf2_2 <= {q3_MW,q2_MW,q1_MW,q0_MW};