newbie question - gpio

Hello,

no clue about what FlexRay is but..

The GPIO pins on a DE2 are 3.3V powered, so they can act as 3.3V LVCMOS/LVTTL pins. They can be in, out or inout pins, with optional tri-state or open-drain function. And a few other things.

That is to say, those pins can implement pretty much anything that uses 3.3V LVCMOS/LVTTL levels. But if you need something else than 3.3V, you need a transceiver.

There are SPI cores. Maybe there's a FlexRay core as well.