The IEEE book on Design of High-Performance Microprocessor Circuits has just recently landed on my desk. Having read a few articles and examined the table of contents I can recommend it as a good reference book.
The book is divided into several sections that covers topic areas such as
Circuit styles for logic,
Memory system design,
Interconnect and I/O, Reliability,
CAD Tools and Test.
The book can be purchased from a variety of book sellers. I purchased mine from www.micromail.ie
04 Apr 2007