Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1995-09-12
1997-08-12
Harvey, Jack B.
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 21, H03K 1716
Patent
active
056574568
ABSTRACT:
An I/O bus interface cell includes a driver circuit having an input terminal fed by a logic signal and an output terminal to produce in response thereto a drive signal having selectable rise and fall time characteristics in accordance with a reference voltage provided to the driver. The I/O cell also includes a receiver circuit having an input terminal coupled to said output terminal of said driver with the receiver disposed to latch an unresolved, unamplified received signal prior to resolving the state of the signal. The I/O cell further includes a termination circuit having a terminal connected to the output of said driver, and having a selectable impedance characteristic at said terminal, with said selectable impedance being in accordance with a reference voltage provided to an input of said termination Circuit. Preferably, the I/O cell the driver, receiver and termination circuits are fabricated on a common semiconductor substrate.
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Coyle Joseph P.
Gist William B.
Digital Equipment Corporation
Fisher Arthur W.
Harvey Jack B.
Maloney Denis G.
Myers Paul R.
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