This article, ARM: Tutorials and Hacks, is full of informations about howto hack an ARM. You'll find tons of tutorials and hacks.

Now that we started with VHDL let’s see another example full of empirical rules that help us to take out the hindrance.
A VHDL project
The most important rules in these type of design are:

Overview
I do not want to make a course about VHDL as a programming language for HW (there are a lot of books better than my words 1), because courses and specifics of languages are public and everyone can find them easily on the Net. I just want to give some suggestions / recommendations by whom, starting many years ago, has had to develop an endless series of projects at different levels of complexity .