Configurable driver circuit and termination for a computer input

Details Configurable driver circuit and termination for a computer input Configurable driver circuit and termination for a computer input

1993-03-31

1994-11-01

Callahan, Timothy P.

Electronic digital logic circuitry

Tri-state

326 82, 327108, 327310, H03K 190185

Patent

active

053610059

ABSTRACT:
A configurable driver/termination circuit for use in a peripheral device connected to a computer input/output controller bus. The driver/termination circuit has the pull-up current source characteristics of a three-state driver and the pull-down current sink characteristics of a open collector driver. Logic circuit defines the operating mode. In a default mode, the driver/termination circuit can function in either open collector or three-state bus designs. The circuit mode is changed by command from a host computer to explicitly operate as an open collector driver/terminator, as a three-state driver, or as an inactive high impedance. Alternatively, peripheral devices automatically select the mode which minimizes data transmission errors.

REFERENCES:
patent: 4866309 (1989-09-01), Bonke et al.
patent: 5107142 (1992-04-01), Bhamidipaty
patent: 5136185 (1992-08-01), Fleming et al.
patent: 5151621 (1992-09-01), Goto
patent: 5285119 (1994-02-01), Takahashi

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