Alpha PCI 64-275 Design Guide

This document is a design guide for the Alpha PCI 64-275 motherboard (EBP30-AN), which is built around the Alpha 21064A microprocessor and configured for the Microsoft Windows NT operating system. It serves as a comprehensive resource for system designers looking to embed a compute engine or develop PCI I/O hardware and software.

The guide details the motherboard's features, configuration, functional operation, and interfaces. Key components include a memory subsystem supporting 16MB to 512MB DRAM with a 128-bit data bus and a reconfigurable Level 2 (L2) cache, and the DECchip 21072 ASIC chipset (comprising 21071-CA for cache/memory control, 21071-BA for data path, and 21071-DA for PCI interface). It also covers PAL control sets, clock subsystems, and various PCI and ISA devices like the Intel Saturn IO chip and National PC87312 combination controller.

The document provides extensive information on system configuration via hardware and software jumpers, the functionality of board connectors, and a detailed system address mapping from the 34-bit CPU address space to PCI memory and I/O spaces, including direct and scatter-gather mapping. Software support encompasses a 1MB flash ROM with a debug monitor and serial ROM (SROM) for initial system setup. Additionally, it outlines board power requirements, environmental characteristics, and physical parameters, with appendices dedicated to system register descriptions, SROM initialization, and comprehensive PCI address maps.