Internal tristate bus with arbitration logic

Details Internal tristate bus with arbitration logic Internal tristate bus with arbitration logic

1998-04-27

2000-11-28

Tokar, Michael

Electronic digital logic circuitry

Multifunctional or programmable

Array

326 86, 326 56, 326 38, H03K 19177

Patent

active

061540501

ABSTRACT:
A programmable logic device having an internal tristate bus is provided. The internal tristate bus may be driven by a plurality of driving elements. Such a tristate bus, and the circuitry for supporting it, can be implemented on less surface area than the multitude of unidirectional buses, and supporting circuitry, which would otherwise be required for the same plurality of driving elements. Accordingly, the amount of surface area that is required to move information within a programmable logic device is reduced. Furthermore, in one embodiment, a arbitration logic circuit is provided for each driving element. These arbitration logic circuits cooperate to prevent the different elements from simultaneously driving the internal tristate bus. Accordingly, the integrity of the information on such bus is maintained.

REFERENCES:
patent: 4969121 (1990-11-01), Chan et al.
patent: 4991085 (1991-02-01), Pleva et al.
patent: 5742179 (1998-04-01), Sasaki
patent: 5789944 (1998-08-01), Choy et al.
patent: 5850152 (1998-12-01), Cliff et al.
patent: 5894228 (1999-04-01), Reddy et al.
patent: 5900743 (1999-05-01), McClintock et al.
patent: 5942913 (1999-08-01), Young et al.

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