21264A Specifications

This document contains detailed specifications for the Alpha 21264A microprocessor, covering its architecture, internal microarchitecture, hardware interface, cache and external interface, register set, initialization, error detection, thermal management, and testability features. It serves as a comprehensive reference for system designers and programmers working with the 21264A.

Key sections include: - Introduction: Overview of the 64-bit load/store RISC architecture and specific EV67 features. - Internal Architecture: Describes the functional units (Ibox, Ebox, Fbox, Mbox, Cbox), pipeline organization, issue rules, and replay traps. - Hardware Interface: Details signal names, pin assignments, and mechanical packaging. - Cache and External Interfaces: Covers system port transactions, Bcache interface, and cache coherency. - Internal Processor Registers: A detailed list and description of IPRs used for control and status. - PALcode: Guidelines and restrictions for Privileged Architecture Library Code. - Initialization: Sequences for power-up, reset, and configuration. - Error Detection: Mechanisms for ECC and parity handling. - Electrical/Thermal Data: Specifications for power and cooling.