I have a design (already mass produced) where the VCCIO is fed with 3.3V, but I/Os on it are configured as BLVDS.
What happens? Does it damage the device? Does it just create an out of spec BLVDS output signal?
It's a EP4CE40F23C8N. I know it's not recommended and I won't deliberately do it, but I have a number of devices out in the field already and want to know what the effects of this are. My BLVDS signal looks ok and does what I want, the question is more I run the risk of damaging something. I have set the outputs to lowest current (8mA) as security measure, though.
The problem would be damage to I/O buffer. If it is exceeding the absolute maximum rating of VCCIO.