Static information storage and retrieval – Systems using particular element – Flip-flop
Patent
1998-03-11
2000-10-03
Nguyen, Tan T.
Static information storage and retrieval
Systems using particular element
Flip-flop
365201, 326 39, 326 40, G11C 1140
Patent
active
061282154
ABSTRACT:
A static random access memory ("SRAM") that is especially suitable for such uses as inclusion on a programmable logic device to provide programmable control of the configuration of that device. The SRAM includes a plurality of SRAM cells, all of which are simultaneously cleared to a first of two logic states by application of a second of the two logic states to clear terminals of the cells. Any cell that needs to be programmed to the second of the two logic states is thereafter specifically addressed and a data signal thereby applied which programs the cell to the second logic state. The cells are preferably constructed so that they are programmed to the second logic state by application of a data signal having the first logic state. Even a very small unipolar MOS pass gate transistor can therefore be used as the addressable path through which the data signal is applied. The memory may also include circuitry for verifying the contents of each cell via the data input terminal of the cell.
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Altera Corporation
Jackson Robert R.
Nguyen Tan T.
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