Bus driver circuit configured to partially discharge a bus condu

Details Bus driver circuit configured to partially discharge a bus condu Bus driver circuit configured to partially discharge a bus condu

1995-11-27

1997-11-25

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 27, 326 58, H03K 1716

Patent

active

056916558

ABSTRACT:
A driver circuit is provided which unconditionally discharges a bus conductor during clock cycles in which the driver circuit is transmitting a value. The unconditional discharge occurs during a first drive phase of the logic drive state. During a second drive phase, the driver circuit either charges or continues to discharge the conductor based on the data value being transmitted. Since the conductors are transitioning in the same direction at approximately the same rate, line to line coupling is virtually non-existent during the first drive phase. By partially discharging bus conductors during the first drive phase, transition speed is increased to the point at which a receiving circuit senses the transmitted value. Effectively, the line-to-line coupling which would have occurred during the first drive phase is endured during the second drive phase, when certain conductors may be recharged. Shifting the coupling to the second drive phase results in the more rapid transition of the bus signals during the first drive phase.

REFERENCES:
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patent: 5297104 (1994-03-01), Nakashima
patent: 5555513 (1996-09-01), Harrington et al.
Patent Abstracts of Japan, vol. 014, No. 336, (E-0953), Jul. 19, 1990 & JP 02 113721 A, (Mitsubishi) Apr. 25, 1990.
International Search Report of PCT/US 96/16462 dated Feb. 7, 1997.

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