System having a host independent input/output processor for cont

Details System having a host independent input/output processor for cont System having a host independent input/output processor for cont

1989-03-23

1992-07-14

Lee, Thomas C.

Boots, shoes, and leggings

364DIG2, 3642383, 3642405, 3642419, 36424292, 36492693, 36492798, 36492799, G06F 1312, G06F 1310

Patent

active

051310813

ABSTRACT:
An input/output (I/O) processor and data processing system in which the processor receives and services interrupt request signals from I/O controllers, which requests may be internally or externally coded, and supervises blockwise transfer of data between an external memory associated with a main processing unit and the I/O controllers. The I/O processor includes an internal memory for storing information pertinent to data transfer from each I/O channel including the address where channel programs, decision tables and data buffers are maintained in external memory. A sequencer executes a specialized instruction set which includes instructions that invoke an interpretation means enabling examination of status registers of the I/O controllers and/or data values therefrom and the branching of execution based thereon. The I/O processor and I/O controllers may be interconnected with a local external memory via a local bus which is selectively coupled with a system bus interconnecting the main processor unit and main external memory.

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