Specifications

9 March 1999 – Subject To Change

• Chapter 1, Introduction, is an overview of the AlphaPC 164LX motherboard,

including its components, features, and uses.

• Chapter 2, System Configuration and Connectors, describes the user-environ-

ment configuration, board connectors and functions, and jumper functions. It

also identifies jumper and connector locations.

• Chapter 3, Power and Environmental Requirements, describes the AlphaPC

164LX power and environmental requirements and provides board dimensions.

• Chapter 4, Functional Description, provides a functional description of the

AlphaPC 164LX motherboard, including the 21174 core logic chip, L3 backup

cache (Bcache) and memory subsystems, system interrupts, clock and power

subsystems, and peripheral component interconnect (PCI) and Industry Standard

Architecture (ISA) devices.

• Chapter 5, Upgrading the AlphaPC 164LX, describes how to upgrade the

AlphaPC 164LX motherboard’s DRAM memory and microprocessor speed.

• Appendix A, System Address Space, describes the mapping of the 40-bit processor

address space into memory and I/O space addresses. It also lists the physical PCI

address spaces and regions, including the 21174 operating registers and PCI/ISA

device registers.

• Appendix B, Support, describes how to obtain information and technical sup-

port, how to order supporting products as well as Alpha products, and how to

obtain associated literature.

Conventions

This section defines product-specific terminology, abbreviations, and other conven-

tions used throughout this manual.

Abbreviations

•

The following list describes the register bit and field abbreviations:

Bit/Field Abbreviation Description

RO (read only) Bits and fields specified as RO can be read but not written.

RW (read/write) Bits and fields specified as RW can be read and written.

WO (write only) Bits and fields specified as WO can be written but not read.