System architecture for multiple input/output devices

Details System architecture for multiple input/output devices System architecture for multiple input/output devices

1996-02-27

1999-12-21

Coles, Edward L.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358434, 358468, 37910001, 37910012, 395733, H04N 100, H04M 1100

Patent

active

060056746

ABSTRACT:
A system or a board that interacts with a processor and multi I/O devices such as high-speed facsimile modems. The processor inputs/outputs data to I/O devices. Each I/O device includes an indicator, such as an Interrupt Request output, to signify a request that the I/O device will output or input data. If the indicator signifies a request, the processor will input data from or output data to the I/O device within a predetermined period Ti, in order to prevent the data from being lost. To this end, the new system or board includes a timer that periodically interrupts the processor and causes it to execute an interrupt service at a period T, where T<=Ti, whereupon the processor detects the indicators of I/O devices, and reads data from or writes data to any I/O device that signals a request.

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