Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1998-02-27
2000-09-26
Tokar, Michael
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 44, 326 45, 326 47, 326101, H01L 2500, H03K 19177
Patent
active
061247294
ABSTRACT:
A field programmable logic array with vertical transistors having single or split control lines is used to provide logical combinations responsive to an input signal. The transistor is a field-effect transistor (FET) having an electrically isolated (floating) gate that controls electrical conduction between source regions and drain regions. If a particular floating gate is charged with stored electrons, then the transistor will not turn on and will act as the absence of a transistor at this location in a logic array within the field programmable logic array. The field programmable logic array is programmed in the field to select a particular logic combination responsive to a received input signal. A logic array includes densely packed logic cells, each logic cell having a semiconductor pillar providing shared source and drain regions for two vertical floating gate transistors that have individual floating gates and control lines distributed on opposing sides of the pillar. Both bulk semiconductor and silicon-on-insulator embodiments are provided. If a floating gate transistor is used to represent a logic function, an area of only 2F.sup.2 is needed per bit of logic, where F is the minimum lithographic feature size.
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Forbes Leonard
Noble Wendell P.
Chang Daniel D.
Micro)n Technology, Inc.
Tokar Michael
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