DATA PROCESSING INTERFACE SYSTEM

摘要

A data processor is coupled with a plurality of peripheral devices via interface units or boxes, each coupled to one or more of such peripheral devices. The data processor and interface boxes are coupled in a full duplex path coupled in a daisy chained or serial manner so that the interface box furthest from the processor along the path has the lowest priority. Data is transferred in cycles with one output word and a priority word being transferred from the processor during each cycle, and with at least one input word capable of being transferred to the processor during each cycle. Apparatus is included to select the interface box with which data transfer is to be made during a cycle, in response to the priority word of the preceding cycle.