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AFE7700: TX DSA LATCH

Part Number: AFE7700
Other Parts Discussed in Thread: AFE7769

Hello,

I am working on the AFE7769 and I am trying to use the latch mode for the TX DSA.
I did these steps :
1) Send 0x02 to the register 0x103 of the DSA page to enable the latch mode on TX1.
2) Store my TX DSA value (not sure how to do it).
3) Send 1 on TXDSALATCH pin.

but nothing happened on the DSA.

So are these steps good or did I forget some steps ?
As GPIOs are in a matrix, do you know the steps to configure GPIO C2 as the TXDSALATCH pin ?

Sincerely,
François Duclos