PCI Express is the third-generation Peripheral Component Inter-connect technology for a wide range of systems and peripheral devices. Incorporating recent advances in high-speed, point-to-point interconnects, PCI Express provides significantly higher performance, reliability, and enhanced capabilities--at a lower cost--than the previous PCI and PCI-X standards. Therefore, anyone working on next-generation PC systems, BIOS and device driver development, and peripheral device design will need to have a thorough understanding of PCI Express. PCI Express System Architecture provides an in-depth description and comprehensive reference to the PCI Express standard. The book contains information needed for design, verification, and test, as well as background information essential for writing low-level BIOS and device drivers.In addition, it offers valuable insight into the technology's evolution and cutting-edge features. Following an overview of the PCI Express architecture, the book moves on to cover transaction protocols, the physical/electrical layer, power management, configuration, and more. Specific topics covered include: *Split transaction protocol *Packet format and definition, including use of each field *ACK/NAK protocol *Traffic Class and Virtual Channel applications and use *Flow control initialization and operation *Error checking mechanisms and reporting options *Switch design issues *Advanced Power Management mechanisms and use *Active State Link power management *Hot Plug design and operation *Message transactions *Physical layer functions *Electrical signaling characteristics and issues *PCI Express enumeration procedures *Configuration register definitions Thoughtfully organized, featuring a plethora of illustrations, and comprehensive in scope, PCI Express System Architecture is an essential resource for anyone working with this important technology