Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The best VHDL reference to date

Until Peter's next book comes out of course! I would give it 5 stars if I was just learning the VHDL language, but I'm actually trying to use VHDL for FPGA design and this book falls short in that regard.This book is really good at explaining the 'mechanics' of VHDL programming. It is an out growth of Peter's "Intro to VHDL" paper that was published on the web and it sort of shows. I really like the depth that it goes into, I wish it had the standard libraries in the appendix. (it doesn't) However, until getting Ashendon's book, all other VHDL texts were pretty opaque.The only thing this book does not have is a treatment of logic 'inference.' Since all VHDL compilers today "infer" (a fancy way of saying "guess") what logic would be able to implement a behavior, not understanding how those compilers guess makes it possible to write syntactically clean VHDL that doesn't synthesize any logic. To get a better handle on inference I'd recommend "HDL Chip Design" by Smith.