Hi Harshit, thanks for your response,
I am using this example, VisualDSP 5.0\214xx\Examples\ADSP-21489 EZ-Board\21489 AD1939 I2S C Sampled-Based Talkthru. I think I2S examples work the same!. I though the sampling rate changed. But i realised with fir filters that the latency remains the same (1/48000)*(TAPS/2+1).
#include "ADDS_21489_EzKit.h"
#include "ad1939.h"
asm("#include <def21489.h>");
By the way, in order to not start another thread 
. Could you please tell me how to store/or define arrays in a specific memory address??For example if i want 4 long arrays from a specific starting address 0x00100000(or whatever) to the end (depending on size).
// NOTE: To select ADC/DAC Sample Rate of either 48 kHz, 96 kHz or 192 kHz, choose one
// of the following 3 macros to set the sample rate (only one at a time).
#define USE_48_KHZ_SAMPLE_RATE
//#define USE_96_KHZ_SAMPLE_RATE
//#define USE_192_KHZ_SAMPLE_RATE
/* Setup the SPI parameters here in a buffer first */
unsigned char ConfigParam1939 [] = {
(AD1939_ADDR), DACMUTE, 0x00,
(AD1939_ADDR), CLKCTRL0, DIS_ADC_DAC | INPUT256 | PLL_IN_MCLK | MCLK_OUT_OFF | PLL_PWR_DWN,
(AD1939_ADDR), CLKCTRL1, DAC_CLK_PLL | ADC_CLK_PLL | DIS_VREF,
#ifdef USE_48_KHZ_SAMPLE_RATE
(AD1939_ADDR), DACCTRL0, DAC_FMT_I2S | DAC_BCLK_DLY_1 | DAC_SR_48K,
#endif
#ifdef USE_96_KHZ_SAMPLE_RATE
(AD1939_ADDR), DACCTRL0, DAC_FMT_I2S | DAC_BCLK_DLY_1 | DAC_SR_96K,
#endif
#ifdef USE_192_KHZ_SAMPLE_RATE
(AD1939_ADDR), DACCTRL0, DAC_FMT_I2S | DAC_BCLK_DLY_1 | DAC_SR_192K,
#endif
(AD1939_ADDR), DACCTRL1, DAC_BCLK_SLAVE| DAC_LRCLK_SLAVE | DAC_CHANNELS_2 | DAC_LATCH_MID, //Ddebug
(AD1939_ADDR), DACCTRL1, DAC_BCLK_SLAVE| DAC_LRCLK_SLAVE | DAC_CHANNELS_2 | DAC_LATCH_MID, //Ddebug
(AD1939_ADDR), DACCTRL2, DAC_WIDTH_24,
#ifdef USE_48_KHZ_SAMPLE_RATE
(AD1939_ADDR), ADCCTRL0, ADC_SR_48K,
#endif
#ifdef USE_96_KHZ_SAMPLE_RATE
(AD1939_ADDR), ADCCTRL0, ADC_SR_96K,
#endif
#ifdef USE_192_KHZ_SAMPLE_RATE
(AD1939_ADDR), ADCCTRL0, ADC_SR_192K,
#endif
BR
CarlosM