Heartbeat collision prevention circuit and method

Details Heartbeat collision prevention circuit and method Heartbeat collision prevention circuit and method

1995-01-06

1996-11-26

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 856, 370 8511, 3408255, H04L 12407

Patent

active

055793150

ABSTRACT:
Heartbeat collision prevention circuit and method in a network in which a plurality of stations are connected to data and heartbeat lines. The heartbeat collision prevention circuit comprises a first delay element for delaying a clock signal, an OR gate for ORing an output signal from the first delay element and the heartbeat signal, an edge detector for detecting an edge of an output signal from the OR gate, a shift register for loading data from a central processing unit and shifting the laded data in response to an output signal from the edge detector, a second delay element being enabled in response to the output signal from the edge detector to delay the clock signal, an AND gate for ANDing an output signal from the second delay element and an enable signal, a slot time counter being enabled in response to the output signal from the edge detector to count an output signal from the AND gate, a signal operation unit for logically combining a plurality of output signals from the slot time counter and a plurality of output signals from the shift register and outputting the resultant signal as a slot time, and a reset unit for logically combining an output signal from the signal operation unit and the output signal from the edge detector and outputting the resultant signal as a reset signal to the slot time counter.

REFERENCES:
patent: 4156112 (1979-05-01), Moreland
patent: 4656627 (1987-04-01), Hasley et al.
patent: 4860006 (1989-08-01), Barall
patent: 5400332 (1995-03-01), Imai

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