The VHDL Golden Reference Guide

Packed with practical advice distilled from years of experience teaching VHDL courses, this book is designed for the experienced design engineer. They are not intended as replacements for the official IEEE Language Reference Manuals, and do not offer a complete, formal description of the languages. Rather, they offer answers to the questions most often asked during practical application of the respective languages, in a convenient reference format.

Nearly everyone I know in the business uses this guide in one way or another. It is tied to Doulos's training course, but serves it's purpose as a VHDL "dictionary" well. It is fairly complete and probably enough for most design and testbench writers.