Processor having operating modes for an upgradeable multiprocessor computer system

摘要

A processor for an upgradable system is disclosed having a type pin that indicates whether the processor is coupled as an OEM processor in a single processor or a dual processor computer system or as an upgrade processor in the dual processor computer system. The type pin causes the appropriate enable and disable of a cache coherency mechanism and a bus arbitration mechanism in the processor and coordination of a dual processor boot-up handshake.