Is there any information on how to use the "Auxiliary snapshots with external events" section of the MAC on a H7 device? i.e. What are the 4 inputs physically connected to?

[DHarv.1]

..

[DHarv.1]

Never mind, I found this post:

https://community.st.com/s/question/0D50X00009cgBn6/how-to-use-stm32h7-ethernet-ptp-auxiliary-snapshots-with-external-events-feature

The jumbled up naming in the reference manual makes searching for signals impossible.