romtab.v

比较先进的直接数字频率合成器的设计。可用于频率的合成。

/*******************************************************************************
****************************************************************************
 **                                                                             
 **                                                                             
 ** Project Name         : DDS                                            
 **                                                                             
 ** Author               : Daniel J. Morelli
 ** Creation Date        : 03/04/96 18:20:21                                              
 ** Version Number       : 1.0                                                 
 **                                                                             
 ** Revision History     :                                                      
 **                                                                             
 ** Date          Initials         Modification                                 
 **                                                                             
 **                                                                             
 ** Description          :                                                      
 **                                                                             
 ** This ,module is the 1/4 wave sin lookup table.  The input to the block is
 ** the phase angle value and the output is the 8 bit sin value.
 ** 
 **                                                                             
 *******************************************************************************/

 module romtab (
	PHASEADD,		// phase address value
	QWAVESIN);		// 1/4 wave sin value

// Port types

input[5:0] PHASEADD;

output[6:0] QWAVESIN;

reg[6:0]	sinrom;				// sine wave ROM

// design architecture
	assign QWAVESIN = sinrom;

	always @(PHASEADD)
	case (PHASEADD)
		6'd0:		sinrom = 7'd0;			// 0.0
		6'd1:	 	sinrom = 7'd3;			//3.12
		6'd2:	 	sinrom = 7'd6;			//6.23
		6'd3:	 	sinrom = 7'd9;			//9.34
		6'd4:	 	sinrom = 7'd12;			//12.44
		6'd5:	 	sinrom = 7'd16;			//15.55
		6'd6:	 	sinrom = 7'd19;			//18.63
		6'd7:	 	sinrom = 7'd22;			//21.71
		6'd8:	 	sinrom = 7'd25;			//24.78
		6'd9:	 	sinrom = 7'd28;			//27.82
		6'd10:	 	sinrom = 7'd31;			//30.86
		6'd11:	 	sinrom = 7'd34;			//33.87
		6'd12:	 	sinrom = 7'd37;			//36.87
		6'd13:	 	sinrom = 7'd40;			//39.84
		6'd14:	 	sinrom = 7'd43;			//42.79
		6'd15:	 	sinrom = 7'd46;			//45.71
		6'd16:	 	sinrom = 7'd49;			//48.60
		6'd17:	 	sinrom = 7'd51;			//51.47
		6'd18:	 	sinrom = 7'd54;			//54.30
		6'd19:	 	sinrom = 7'd57;			//57.10
		6'd20:	 	sinrom = 7'd60;			//59.87
		6'd21:	 	sinrom = 7'd63;			//62.60
		6'd22:	 	sinrom = 7'd65;			//65.29
		6'd23:	 	sinrom = 7'd68;			//67.94
		6'd24:	 	sinrom = 7'd71;			//70.56
		6'd25:	 	sinrom = 7'd73;			//73.13
		6'd26:	 	sinrom = 7'd76;			//75.65
		6'd27:	 	sinrom = 7'd78;			//78.13
		6'd28:	 	sinrom = 7'd81;			//80.57
		6'd29:	 	sinrom = 7'd83;			//82.95
		6'd30:	 	sinrom = 7'd85;			//85.29
		6'd31:	 	sinrom = 7'd88;			//87.57
		6'd32:	 	sinrom = 7'd90;			//89.80
		6'd33:	 	sinrom = 7'd92;			//91.98
		6'd34:	 	sinrom = 7'd94;			//94.10
		6'd35:	 	sinrom = 7'd96;			//96.17
		6'd36:	 	sinrom = 7'd98;			//98.17
		6'd37:	 	sinrom = 7'd100;		//100.11
		6'd38:	 	sinrom = 7'd102;			//102.01
		6'd39:	 	sinrom = 7'd104;			//103.83
		6'd40:	 	sinrom = 7'd106;			//105.60
		6'd41:	 	sinrom = 7'd107;			//107.30
		6'd42:	 	sinrom = 7'd109;			//108.93
		6'd43:	 	sinrom = 7'd111;			//110.50
		6'd44:	 	sinrom = 7'd112;			//112.00
		6'd45:	 	sinrom = 7'd113;			//113.44
		6'd46:	 	sinrom = 7'd115;			//114.81
		6'd47:	 	sinrom = 7'd116;			//116.10
		6'd48:	 	sinrom = 7'd117;			//117.33
		6'd49:	 	sinrom = 7'd118;			//118.49
		6'd50:	 	sinrom = 7'd120;			//119.58
		6'd51:	 	sinrom = 7'd121;			//120.59
		6'd52:	 	sinrom = 7'd122;			//121.53
		6'd53:	 	sinrom = 7'd122;			//122.40
		6'd54:	 	sinrom = 7'd123;			//123.19
		6'd55:	 	sinrom = 7'd124;			//123.91
		6'd56:	 	sinrom = 7'd125;			//124.56
		6'd57:	 	sinrom = 7'd125;			//125.13
		6'd58:	 	sinrom = 7'd126;			//125.63
		6'd59:	 	sinrom = 7'd126;			//126.04
		6'd60:	 	sinrom = 7'd126;			//126.39
		6'd61:	 	sinrom = 7'd127;			//126.66
		6'd62:	 	sinrom = 7'd127;			//126.85
		6'd63:	 	sinrom = 7'd127;			//126.96
	endcase

endmodule