Digital Semiconductor 21172 Core Logic Chipset

This technical reference manual provides comprehensive documentation for the Digital Semiconductor 21172-AA core logic chipset. The 21172 chipset is designed to support the 21164 Alpha microprocessor in high-performance uniprocessor systems. It consists of the 21172-CA Control, I/O Interface, and Address chip (CIA) and the 21172-BA Data Switch chip (DSW).

Key contents include: - Chipset Architecture: Overviews of the CIA and DSW microarchitectures, system data paths, and coherency protocols. - Pin Descriptions: Detailed pin lists and signal descriptions for both the CIA and DSW chips, including system bus, IOD bus, memory control, and PCI local bus signals. - Control and Status Registers (CSRs): A programmer's reference for configuring memory timing, performance monitoring, and error handling. - Address Mapping: Detailed information on how the 21172 maps 21164 physical addresses to memory and I/O space, including direct mapping and scatter-gather translation. - System Initialization: Power-up and reset requirements. - Mechanical Specifications: Package dimensions for both the CIA (EPBGA) and DSW (PQFP) components.