Programmable bus driver isolation

Details Programmable bus driver isolation Programmable bus driver isolation

1978-10-30

1980-11-25

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307203, 307296R, H03K 1332, H03K 19007, H03L 502

Patent

active

042360870

ABSTRACT:
A method of and an apparatus for selectively isolating digital data bus drivers from digital data busses for fault recovery and diagnostic purposes. The digital data bus drivers may be either transistor-transistor logic (TTL) or emitter coupled logic (ECL). For TTL digital data bus drivers, the input voltage (V.sub.CC) is supplied via a switching power transistor. For ECL digital data bus drivers, the ground connection (V.sub.CC1) is made via a switching power transistor. In either case, the switching power transistor is turned on and off in response to one binary bit in an isolation register coupled to the power transistor via an open collector gate or electromechanical switch. By supplying the V.sub.CC (for TTL) or V.sub.CC1 (for ECL) connection to each digital data bus driver through a switching power transistor and controlling each switching power transistor through a different binary bit in the isolation register, the isolation (or non-isolation) status of each digital data bus driver may be controlled via the isolation register to permit the digital data bus to operate notwithstanding failures effecting the state of one or more of the digital data bus drivers connected to it.

REFERENCES:
patent: 3562555 (1971-02-01), Ahrons
patent: 3725675 (1973-04-01), Olsen
patent: 3751684 (1973-08-01), Struger
patent: 3859560 (1975-01-01), Peters

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