In a computer system, a plurality of input/output processors (IOP's) are connected via an asynchronous input/output bus, called an "SPD" bus, to one side of an input/output interface controller (IOIC). The other side of the IOIC is connected to a storage controller (SC) via a synchronous bus called an...http://www.google.com/patents/US5003465?utm_source=gb-gplus-sharePatent US5003465 - Method and apparatus for increasing system throughput via an input/output bus and enhancing address capability of a computer system during DMA read/write operations between a common memory and an input/output device
