I am using the 2019_r1 reference design for a FMCOMMS5 with a ZC706 carrier. I am trying to gain a better understanding of what actions are taken at the firmware and physical device (AD9361) levels when utilizing the IIO Oscilloscope AD936X Advanced tab shown below. Specifically, I want to understand what occurs when MCS Sync and Calibrate are selected. I have observed ADC "valid" signals align and Tx Phase is set to a value when MCS Sync is selected. What is Tx Phase and how does it relate to MCS Sync? If Tx Phase is manually adjusted, I can observe the ADC "valid" signals becoming out of phase. Chip B ADC "valids" may even stop pulsing high. Why? Do either of these options adjust the I/O delays in the digital interface to the AD9361 devices?
See here: https://wiki.analog.com/resources/eval/user-guides/ad-fmcomms5-ebz/phase-sync