Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1994-08-12
1995-05-09
Westin, Edward P.
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 39, 326 62, H03K 19177, H03K 190175
Patent
active
054143764
ABSTRACT:
An improved programmable logic device (PLD) having a macrocell operable in a registered mode is disclosed. The improved PLD has exclusive lines for both registered feedback and for external input, both of which are fed into a single multiplexer. The output of the multiplexer is fed into the PLD's AND array. The external input line is coupled to the I/O terminal of the macrocell. A tri-state output buffer selectively decouples the I/O terminal from the macrocell output so that the I/O terminal may be employed to alternately receive a registered output signal from the macrocell or to send an external control signal to the AND array.
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Fox III Angus C.
Micron Semiconductor Inc.
Santamauro Jon
Westin Edward P.
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