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TMS320F28388D: Why did the FSI ping watchdog only affect the node that does not receive the FSI ping frames?

Part Number: TMS320F28388D


Tool/software:

I have developed a system with two cards that communicate via FSI using fiber optics. The FW is almost identical for both, it changes that one is master and the other is slave, so as to disambiguate in the handshake phase. I've added a rx ping watchdog timeout that operates what the RX INT2 does. 
The scenario that creates doubts for me is:
1) Detachment from the receiver of the node2
2) node two fails and goes to the ISR relative to INT2
3) I make sure to disable his ping timer
4) I reset the RX module

Why doesn't the watchdog error go off on node 1?
Node 2 doesFSInot transmit ping frames