Instructor
Posts: 9,049
Registered: ‎08-14-2007
Re: Spartan6 - Which IO modes have clamp diodes?

As Bob indicated, this is a question for the Xilinx gurus, but I'd be

very cautious of doing this myself for two reasons.

 

1) Does the clamp diode really get turned on if Vcco is only 1.5V?

 

2) Where is the threshold for Vih and Vil actually generated?  Is it ratiometric

to Vcco?  Or is it like LVTTL, i.e. fixed and perhaps dependent only on Vccaux?

 

-- Gabor

-- Gabor