Specifications

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Subject to Change – 17 January 1997
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Chapter 4, Functional Description, provides a functional description of the
AlphaPC 164 motherboard, including the 21172 core logic chipset, L3 backup
cache (Bcache) and memory subsystems, system interrupts, clock and power
subsystems, and peripheral component interconnect (PCI) and Industry Standard
Architecture (ISA) devices.
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Chapter 5, Upgrading the AlphaPC 164, describes how to upgrade the AlphaPC
164 motherboard’s DRAM memory and microprocessor speed.
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Appendix A, System Address Mapping, describes the mapping of the 40-bit
processor address space into memory and I/O space addresses.
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Appendix B, I/O Space Address Maps, lists the physical AlphaPC 164 PCI
address spaces and regions, including the 21172-CA operating registers and
PCI/ISA device registers.
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Appendix C, SROM Initialization, describes the general serial read-only
memory (SROM), Bcache, and memory initialization steps and associated
parameters. Also included are the firmware interface, timing considerations, and
SROM header information.
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Appendix D, Supporting Products, lists sources for components and accessories
not included with the AlphaPC 164 motherboard.
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Appendix E, Glossary and Acronyms, lists and defines terms associated with the
AlphaPC 164 motherboard.
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Appendix F, Support, Products, and Documentation, describes how to obtain
Digital Semiconductor information and technical support, and how to order
Digital Semiconductor products and associated literature.
Conventions
This section defines product-specific terminology, abbreviations, and other
conventions used throughout this manual.
Abbreviations
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Register Access
The following list describes the register bit and field abbreviations: