Do you have any good documentation about VHDL?
Besides the numerous websites I've bookmarked myself, I have two hard copies of VHDL books:
Digital System Design with VHDL by Mark Zwolinski.
This one I would not recommend to start with VHDL (I had to buy this one as one of my first books at uni)
Circuit Design and Simulation with VHDL by Volnei Pedroni.
This is a much better one, to my opinion suitable for starters. Had to buy this one for my second year at uni.
If you search long enough you can find these digitally on the web although I strongly recommend to have a hard copy (at least of the second one).