Programmable input/output circuit and programmable logic device

Details Programmable input/output circuit and programmable logic device Programmable input/output circuit and programmable logic device

1989-09-06

1991-01-22

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307243, 307468, 307473, H03K 19177

Patent

active

049873199

ABSTRACT:
In a programmable input/output circuit which is used in a programmable integrated circuit, for interfacing between an external circuit and an internal logic circuit, both disposed exteriorly and interiorly of said integrated circuit, an input/output terminal connected to a bus of the internal logic circuit and a tri-state input buffer are provided, and hereby assured that an external input signal is transmitted to either of the input/output terminal and an ordinary input terminal by switching the status of the tri-state input buffer. In a programmable logic device, which incorporates said input/output circuit, a tri-state buffer is provided between an input/output circuit block and a wiring element, and hereby a driving capability of the wiring element used as a bus line is increased.

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