Three line communications method and apparatus

Details Three line communications method and apparatus Three line communications method and apparatus

1992-12-28

1994-07-05

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082506, 34082512, H04Q 100

Patent

active

053271211

ABSTRACT:
A communications scheme is provided whereby each of a plurality of I/O devices is connected to a system controller via three lines: a bidirectional data bus, a clock bus, and a bidirectional enable/interrupt line. The enable/interrupt lines serve the dual-purpose of carrying interrupt signals from an I/O device to the system controller and carrying enable signals from the system controller to the I/O device. To avoid conflict on an enable/interrupt line, an I/O device may send an interrupt only while the clock signal is at a first level. When the clock signal is at a second level, the I/O device is required to monitor its enable/interrupt line for an enable signal from the system controller.

REFERENCES:
patent: 4313196 (1982-01-01), Oblonsky
patent: 4404672 (1983-09-01), Shimizu
patent: 4644348 (1987-02-01), Gerety
patent: 4669079 (1987-05-01), Blum
patent: 4779093 (1988-10-01), Watkins
patent: 4885578 (1989-12-01), Perry et al.

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