ADSP21469 SPDIF Rx and Tx latency

Question

Hi all, 
 I can't find any information on the signal delay that the SPDIF receiver and transmitter introduce. 
 I assume that the transmitter does not generate signal latency at all, however the receiver should. 
 So, let's assume the following: 
 DSP 1 generates a master clock, outputs a signal via ADCs and passes this signal via SPDIF transmitter to DSP2 
 DSP2 uses the recovered clocks and outputs the received signal via ADC. 
 Currently, I measure a delay of 3.5 samples at 48 kHz between these 2 analog signals. 
 But there should be any official information about this, shouldn't it? 
 Best regards, 
 Rainer

Hfuhrhurr · Accepted Answer

Hi Jithul, 
 I have a 21469, feed an AES signal into the SPDIF Receiver, connect DIR_FS_O, DIR_CLK_O, DIR_DAT_O and DIR_TDMCLK_O to the respective inputs of the SPDIF transmitter and grab the output by a measurement system. 
 I, then measure the frequency resp. impulse response of this system. 
 First, I do a reference measurement of my measurement system by connecting the AES output and input of the measurement system using a wire. Impulse response measurements using this wire, then, show a latency of zero. 
 Then, I connect the DSP to the measurement system and measure the impulse response which shows a latency of 3,5 samples. 
 Regards, 
 Rainer)

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ADSP21469 SPDIF Rx and Tx latency