Static information storage and retrieval – Associative memories – Ferroelectric cell
Patent
1998-12-16
1999-10-26
Tran, Andrew Q.
Static information storage and retrieval
Associative memories
Ferroelectric cell
36523002, G11C 1504
Patent
active
059739509
ABSTRACT:
The present invention provides a priority encoder having at least a unit circuitry of at least three hierarchies. A lowermost level hierarchy has a plurality of lowermost level encoder circuits receiving a plurality of input signals with individually different priorities for encoding the input signals and outputting encoded output signals. The lowermost level encoder circuits are operated to output enable signals which indicate existence of signals to be coded into address signals in the input signals. An intermediate level hierarchy has a plurality of multiplexer circuits connected to the lowermost level encoder circuits for receiving the encoded output signals and the enable signals so that the multiplexer circuits are configuared to output only and encoded signal which has a highest priority in the encoded output signals to be corded into address signals. An uppermost level hierarchy has at least an uppermost level encoder circuit receiving the enable signals from the lowermost level encoder circuits for encoding the enable signals too output encoded enable signals.
REFERENCES:
patent: 5555397 (1996-09-01), Sasama et al.
patent: 5726942 (1998-03-01), Yoneda et al.
NEC Corporation
Tran Andrew Q.
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