Communications subsystem idle link state detector

Details Communications subsystem idle link state detector Communications subsystem idle link state detector

1980-10-06

1983-04-05

Chan, Eddie P.

Boots, shoes, and leggings

34082506, 370 79, G06F 304

Patent

active

043793401

ABSTRACT:
A data processing system includes a communications subsystem communicating with a number of devices. A counter monitors the communication line to detect when a communication line goes idle, that is at least 15 successive binary ONE bits appear on the line for the bit oriented protocol mode. The counter advances on successive binary ONE bits and is forced to a hexadecimal ZERO in response to a binary ZERO. If the counter reaches a count of hexadecimal F (decimal 15) a carry signal from the counter prevents the counter from advancing and initiates an idle link state.

REFERENCES:
patent: 4093981 (1978-06-01), McAllister et al.
patent: 4168469 (1979-09-01), Parikh et al.
patent: 4225919 (1980-09-01), Kyu et al.
patent: 4254462 (1981-03-01), Raymond et al.

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