Yes, that is the place to start, here is the easy link:
http://www.logicpd.com/su.../viewtopic.php?t=523
Also, we have a paper about using GPIO on the LH7A400-10.
http://www.logicpd.com/do...07/1000475_Rev_A.pdf
This doesn't explain use as interrupts, but it is a good place for reference.
What OS are you using?