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VHDL: Analysis and Modeling of Digital Systems ReviewBackground info:
I have been an ASIC engineer since 1986. I have designed many ASICs in Verilog and VHDL. I have 7 books on VHDL including Dr. Navabi's text.
Some of the VHDL books out there are more like cookbooks: too many code examples and not enough explanation. Navabi's book is NOT a cookbook.
Further, it is hard to do a direct comparison to other VHDL texts. In a way it would be like comparing apples and oranges. While some VHDL texts try to explain everything about VHDL, other books like Dr. Navabi's explain the more useful parts of VHDL as being used by a digital systems or ASIC designers. While other books are mostly for RTL coders with very little testbench and system level modeling info. In my opinion, test is extremely important as well as modeling at the system level. Many books out there do not do a good job on those aspects. Most books provide very brief explanations of test benches and/or system level modeling.
This book is highly useful for a digital systems design engineer or architect. This book is not only covers coding for RTL synthesis but doing the testbenches, and sytem level modeling as well. This book has a very good balance between all the main uses of the VHDL modeling langauage.
Here is my overview of the chapters :
The first two chapters provides you with a history of modeling languages and the reason VHDL was created. I recommend that you read these chapters, especially if this is your first modeling language. The chapters are not long, but it provides a very good high level overview to modeling, synthesis, and test.
Chapter three gets you up and running quickly by providing simple examples to give you a good introduction to behavioral and structural VHDL.
Chapters 4 though 9 are heart of the VHDL aspect of the book.
Chapter 4 is very important. It describes VHDL inertial and concurrent timing in great detail. In fact, I believe Dr. Navabi's book is the best available in this aspect! It is important to understand for modeling and especially testing purposes. Chapter 5 is on structural VHDL. it is a good place to start since it is the easiest to understand. Chapter 6 introduces procedures, functions, packages, generics, and configurations. I like the way this chapter is written. Other books are not as easy to read as this one. Great examples and its clearly written as is the entire book actually. Chapter 7 digs into the VHDL types, operators, and attributes. Chapter 8 covers guarding and signal resolution. It also provides a good state machine example. Once you get through Chapter 8, pat yourself on the back because you got through the hard parts of VHDL! VHDL is a harder language to learn than Verilog. But for good reason, VHDL is much more powerful and structured than Verilog in my opinion. You can code faster in Verilog, but the code is not typically as readable as VHDL. Most of the VHDL codes I have seen are much more readable. Some of the Verilog code I have seen are downright nasty looking and time consuming to interpret. Chapter 9 starts to put it (chapters 6-8) all together by more thorough examples behavioral modeling: testbenches/harnesses, arbitration/handshaking, etc.
Chapters 10-11 puts it all together with some system examples : cpu, dma, system bus modeling/timing/interfacing, etc. even memory caches! These are not complicated examples but they are real world examples. All of the techniques are still begin used today. If they were more complicated examples the book would need to be much bigger. However, these are great examples that ties everything up. Once you complete chapter 11, you are well on your way! You will have accomplished something!
Don't overlook Chapters 12 (advanced modeling) and the appendices (esp. App. B, the synthesis subset). This additional information puts Navabi's book above other VHDL books in my opinion.
Conclusion:
It is difficult to create a VHDL book to be 'the' book for all types and levels of designers and engineers (architectural, RTL coders, testbench and verification, etc.) But, in my opinion this book comes closest. I highly recommend this book! I have many books on VHDL. This book is valuable to me as a reference and has helped me tremendously - it's a keeper! All the codes work and I only found one insignificant typo. I can not say that about any of my other VHDL books. In fact, I will probably soon be getting rid of some of my VHDL books to make space on my shelves for new books. I'll be keeping Navabi's VHDL book as a permanent reference- for sure! I recommend this book for beginners because I like the way it progresses and delivers the material: in the right order and in the right amount. I recommend this book for moer advanced people as well, I am sure that it has material that is not covered in other VHDL books. And it makes a great reference as well.
P.S.
There are recent additions to VHDL that are not discussed in this book..namely VHDL-AMS, which adds analog extentions. However, it is still very young and most simulators do not support the analog extentions yet.
VHDL: Analysis and Modeling of Digital Systems OverviewThe definitive guide to VHDLÑnow updated with the new VHDL93 standard! Here's the new second edition of the authoritative reference engineers need to guide them through the use of VHDL hardware description language in the analysis, simulation, and modeling of complicated microelectronic circuits. The number and depth of its relevant and practical examples and problems is what sets this edition apart from other VHDL texts. It includes extensive new material to bring the guide fully up to date with the new VHDL93 standard, including new chapters on design flow, interfacing, modeling, and timing, as well as appendixes on logic synthesis and description styles.
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