Static information storage and retrieval – Floating gate – Particular connection
Patent
1997-04-09
1998-04-14
Yoo, Do Hyun
Static information storage and retrieval
Floating gate
Particular connection
36518516, 36518529, 36518514, 365218, G11C 1140
Patent
active
057401063
ABSTRACT:
A configuration circuit includes a plurality of configuration cells where each configuration cell has (a) a nonvolatile pull-up cell coupled to an output node and for coupling to a first power supply voltage, and (b) a nonvolatile pull-down cell coupled to the nonvolatile pull-up cell and to the output node and for coupling to a second power supply voltage, where the nonvolatile pull-up cell includes a first nonvolatile transistor, and the nonvolatile pull-down cell includes a second nonvolatile transistor. The configuration cell may further include a volatile transistor in the nonvolatile pull-up and/or pull-down cells. In addition, the configuration cell may include a first erase device coupled to the first nonvolatile transistor for discharging charges on the floating gate of the first nonvolatile transistor and a second erase device coupled to the second nonvolatile transistor for discharging charges on the floating gate of the second nonvolatile transistor. Furthermore, the configuration cell can include a third nonvolatile transistor for programming the first nonvolatile transistor and a fourth nonvolatile transistor for programming the second nonvolatile transistor. The nonvolatile or volatile transistors included in the configuration cell may be an N-type or a P-type MOSFET having a floating gate, and each may be either an enhancement-type or a depletion-type. The configuration circuit may also include pass circuits to couple the configuration cell to the first and second power supply voltages and to programming lines.
REFERENCES:
patent: 4829203 (1989-05-01), Ashmore, Jr.
patent: 5088066 (1992-02-01), Castro
patent: 5101378 (1992-03-01), Radji et al.
patent: 5329487 (1994-07-01), Gupta et al.
Cypress Semiconductor Corp.
Yoo Do Hyun
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