My customer is facing a strange behavior that output delay about 20us sometime.
The delay has been observed 1/10 ~ 1/100 times start-up. Their fifo sync configuration is as below.
Syncsel_mixer: 0100: SYNC
Syncsel_nco: 0100; SYNC
Syncsel_dataformatter: 00; FRAME
Syncsel_fifioin: 0001; SYNC
Sysncsel_fifoout: 0001; SYNC
Clkdiv_sync_sel: 0; OSTR
Could you review these configuration and give your advice to their investigation?
Waveform is here
If you need other information, please let me know.