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AWR1243: Confused on the usage of FMCW_SYNCIN1/2 in the cascade mode

user4199584
Prodigy 100 points
Part Number: AWR1243

Hi, TI experts

I'm now working on a 4-chip AWR1243 cascade board, but when I read through the forum, I find contradictory answers about the usage of FMCW_SYNCIN1/2:

(1) In this thread (https://e2e.ti.com/support/sensors/f/1023/p/744709/2770535), Randy Rosales said "[TI] Currently the released firmware (DFP v1.2.0) only supports FMCW_SYNCIN1 input in Cascade mode. "

(2) But in another thread (https://e2e.ti.com/support/sensors/f/1023/t/777624)，Anand Gadiyar said "You can use either FM_CW_SYNCIN1 or FM_CW_SYNCIN2."

So which one should I follow? Can I use FMCW_SYNCIN2 in the cascade mode?

Qian