Hi,
I'm trying to find out when exactly the XC9572XL recognizes a falling edge. It has a 3.3V supply, and the signal is a square wave between 0V and 5V (this Xilinx is 5V input compatible). At what voltage would a falling edge trigger?
I have looked at its datasheet but can't find anything that fits what I'm seeing - I thought that maybe 0.8V was the falling edge threshold (since it is the highest input low voltage), but from my testing it seems to happen a
*lot* earlier than that, maybe when the voltage drops to about 4.3V, but that can't be correct I realize.Apologies for what must seem such a basic question, but if anyone could please clarify I would be extremely grateful, thank you.
James