dds.v

直接频率合成

`include "romtab.v"
`include "claadd8s.v"
`include "loadfw.v"
`include "loadpw.v"
`include "sinlup.v"
`include "phasea.v"
`include "phasemod.v"
`include "pngen.v"

/*******************************************************************************
 ****************************************************************************
 **                                                                             
 **                                                                             
 ** Project Name         : DDS                                            
 **                                                                             
 ** Author               : Daniel J. Morelli
 ** Creation Date        : 03/04/96 21:51:00                                              
 ** Version Number       : 1.0                                                 
 **                                                                             
 ** Revision History     :                                                      
 **                                                                             
 ** Date          Initials         Modification                                 
 **                                                                             
 **                                                                             
 ** Description          :                                                      
 **                                                                             
 ** This is the top level of the Direct Digital Synthesizer
 ** 
 **                                                                             
 *******************************************************************************/

 module dds(
	RESETN,				// global reset
	PNCLK,				// PN generator clock
	SYSCLK,				// system clock
	FREQWORD,			// input frequency word from external pins
	FWWRN,				// low asserted frequency word write strobe
	PHASEWORD,			// input phase word from external pins
	PWWRN,				// low asserted frequency word write strobe
	IDATA,				// I axis data
	QDATA,				// Q axis data
	COS,					// digital cos output
	SIN,					// digital sin output
	MCOS,					// modulated digital cos output
	MSIN,					// modulated digital sin output
	DACCLK,				// DAC clock to signal when to load DDS sin value
	DACOUT);				// DAC output of sin wave

// Port types

input SYSCLK, PNCLK, RESETN, FWWRN, PWWRN;
input[31:0] FREQWORD;
input[7:0] PHASEWORD;

output DACCLK, COS, SIN, MCOS, MSIN, IDATA, QDATA;
output[7:0] DACOUT;

wire[31:0] 	syncfreq;		//synchronous frequency word
wire[7:0]	syncphswd;		//synchronous phase word
wire[7:0] 	phase;			// phase output from phase accumulator
wire[7:0]	modphase;		// modulated phase value after phase mod block

// design architecture
	assign DACCLK = SYSCLK;

//---------------------------------------------------------------
// this module is not part of the NCO
// this module is used to generate random data
// to modulate the NCO output
//---------------------------------------------------------------
 pngen U_pngen(
	RESETN,				// global reset
	PNCLK,				// PN generator clock
	IDATA,				// I axis data
	QDATA);				// Q axis data
//---------------------------------------------------------------

 loadfw U_loadfw(
	RESETN,			// global reset
	SYSCLK,			// system clock
	FREQWORD,		// input frequency word from external pins
	FWWRN,			// low asserted frequency word write strobe
	syncfreq);		// synchronous frequency word

 loadpw U_loadpw(
	RESETN,			// global reset
	SYSCLK,			// system clock
	PHASEWORD,		// input phase word from external pins
	PWWRN,			// low asserted frequency word write strobe
	syncphswd);		// synchronous phase word

 phasea U_phasea(
	SYSCLK,			// system clock input
	RESETN,			// global reset
	syncfreq,		// synchronous frequency word
	COS,				// digital cos output
	SIN,				// digital sin output
	phase);			// 8 bit quantized phase output

 phasemod U_phasemod (
	SYSCLK,			// system clock input
	RESETN,			// global reset
	syncphswd,		// synchronous phase word
	phase,			// 8 bit quantized phase value
	MCOS,				// modulated digital cos output
	MSIN,				// modulated digital sin output
	modphase);		// modulated phase output

 sinlup U_sinlup (
	SYSCLK,			// system clock input
	RESETN,			// global reset
	modphase,		// modulated phase output
	DACOUT);			// DAC output of sin wave

endmodule