21264/EV68A Microprocessor Hardware Reference Manual

This document serves as the hardware reference manual for the Compaq Alpha 21264/EV68A microprocessor. It covers the internal architecture, including instruction fetch, issue, and retire units, integer and floating-point execution units, cache structures, and memory interfaces. Additionally, it details hardware interface signals, pin assignments, electrical and thermal specifications, and provides an extensive guide to internal processor registers (IPRs) and PALcode restrictions. It is intended for system designers and programmers using this microprocessor.