Apparatus and method for selecting polarity and output type in a

Details Apparatus and method for selecting polarity and output type in a Apparatus and method for selecting polarity and output type in a

1993-03-30

1995-01-31

LaRoche, Eugene R.

Electronic digital logic circuitry

Multifunctional or programmable

326 82, H03K 19177

Patent

active

053861558

ABSTRACT:
A specialized output buffer circuit which obviates the need to utilize a separate multiplexer to determine polarity selection and output type selection in a programmable logic device is disclosed. In accordance with the present invention, these determinations are made in a specialized output buffer circuit. A sum of product term, a complement of the sum of product term, a registered version of the sum of product term, and a complement of the registered version of the sum of product term, are coupled directly to the output buffer circuit, wherein one of these signals is selected and coupled to an output pin.

REFERENCES:
patent: 4789951 (1988-12-01), Birkner et al.
patent: 4894563 (1990-01-01), Gudger
patent: 4914322 (1990-04-01), Win et al.
patent: 5023485 (1991-01-01), Sweeney
patent: 5027315 (1991-01-01), Agrawal et al.

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