Importance

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Abstract

A multiprocessor system comprises a plurality of stations interconnected by a system communication bus and cooperating in the performance of system tasks. Each station includes a plurality of addressable elements interconnected by a station communication bus. All stations are mapped into a common address space, with the elements of each station mapped onto like relative addresses in two subspaces of the address space; a subspace which is shared in common by all stations, and a subspace dedicated to the station whose addresses are the common subspace addresses in combination with a station-identifying address portion. The stations are symmetrical: like elements in all of the stations are mapped onto like relative addresses in their associated subspaces. Addressing within the system is self-referential: a station accesses one of its addressable elements by placing its common subspace address on the station communication bus. Each station's station bus is selectively interfaced to the system bus, and a station accesses an addressable element of another station by placing its dedicated subspace address on the station bus, interfacing its station bus with the system bus, and causing the other station to interface its station bus with the system bus. A station accesses an element of another station passively, without utilizing the intelligence, if any, of the other station to make the access.

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First Claim