Programmable circuit optionally configurable as a lookup...

Details Programmable circuit optionally configurable as a lookup... Programmable circuit optionally configurable as a lookup...

2006-07-11

2006-07-11

Barnie, Rexford (Department: 2819)

Electronic digital logic circuitry

Multifunctional or programmable

Having details of setting or programming of interconnections...

C326S039000, C326S041000

Reexamination Certificate

active

07075333

ABSTRACT:
Circuits that can be optionally programmed to function as lookup tables (LUTs) or wide multiplexers, and integrated circuits including these programmable circuits. A function select multiplexer is included between each memory cell and the corresponding data input terminal of a first multiplexer. Each function select multiplexer has a first data input terminal coupled to the corresponding memory cell, a second data input terminal coupled to an external input terminal, and a select terminal controlled by a value stored in a function select memory cell. When a first value is stored in the function select memory cell, the programmable circuit functions in the same fashion as a known LUT. When a second value is stored in the function select memory cell, the programmable circuit functions as a wide multiplexer, with the data input values being provided by the external input terminals.

REFERENCES:
patent: 5352940 (1994-10-01), Watson
patent: 5889413 (1999-03-01), Bauer
patent: 6292019 (2001-09-01), New et al.
patent: 6556042 (2003-04-01), Kaviani
patent: 6768338 (2004-07-01), Young et al.
patent: 2005/0146352 (2005-07-01), Madurawe

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