Digital 1

Hi,
Quick question: I am using the daughterboards DEBUG IO pins , and I am
connecting them to my logic analyzer. I have to enter the threshold
value in
my logic analyzer. I can choose between TTL (1.4V) CMOS (2.5V) ECL
(-1.3V).
I am not sure which one to choose. Right now I have it set to a user
value
of 3.30V, is that the right choice?

Thanks,

Oussama.

Oussama S. wrote:

Hi,
Quick question: I am using the daughterboards DEBUG IO pins , and I am
connecting them to my logic analyzer. I have to enter the threshold
value in my logic analyzer. I can choose between TTL (1.4V) CMOS
(2.5V) ECL (- 1.3V). I am not sure which one to choose. Right now I
have it set to a user value of 3.30V, is that the right choice?

All the signals are LVCMOS, 0 to 3.3V. The correct threshold is 1.65V
(3.3V/2)

Matt

Ok :slight_smile:
thanks Matt.

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