Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1997-10-15
2000-04-11
Tokar, Michael
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 38, H01L 2500, H03K 19177, H03K 19173
Patent
active
060492244
ABSTRACT:
A programmable logic device, such as an FPGA, is implemented using logic cells that have configurable connection schemes between routing resources and logic element input pins. For example, in one embodiment, each logic cell in the device has a flexible input structure that supports two or more different connection schemes, which may or may not involve input sharing, where each logic cell can be individually programmed for any of the available connection schemes when the device is configured. As such, the device can be efficiently programmed to implement the user's specific circuitry. The invention balances the competing goals of (1) reducing routing requirements by limiting the number of connections between routing resources and logic element input pins and (2) providing minimally constrained programming of logic elements.
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patent: 5386156 (1995-01-01), Britton et al.
patent: 5436574 (1995-07-01), Veenstra
patent: 5481486 (1996-01-01), Cliff et al.
patent: 5815003 (1998-09-01), Pedersen
patent: 5905385 (1999-05-01), Sharpe-Geisler
Britton Barry K.
McEwen Ian L.
Nguyen Ho T.
Singh Satwant
Spivak Carolyn W.
Chang Daniel D.
Lucent Technologies - Inc.
Tokar Michael
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