System for allowing a content addressable memory to operate with

Details System for allowing a content addressable memory to operate with System for allowing a content addressable memory to operate with

1993-06-25

1994-10-18

LaRoche, Eugene R.

Static information storage and retrieval

Associative memories

Ferroelectric cell

36518907, 365226, G11C 1500

Patent

active

053574583

ABSTRACT:
A system for allowing a content addressable memory (CAM) to operate with first and second power voltage levels including: a first input voltage for providing a first bias to the content addressable memory; a second input voltage for providing a second bias to the content addressable memory; and a selection device coupled to the first input voltage and the second input voltage for decoupling the first input voltage from the content addressable memory and coupling the second input voltage to the content addressable memory in response to coupling the second power voltage level to the content addressable memory. In a specific embodiment the system includes: a first power on reset coupled to the content addressable memory for initializing the content addressable memory when the first power voltage level is initially coupled to the content addressable memory; and a second power on reset coupled to the content addressable memory for initializing the content addressable memory when the second power voltage level is initially coupled to the content addressable memory. The system allows a CAM to operate at a power voltage level of 2.6 to 3.6 volts to reduce power dissipation and at a higher voltage during programming of an electrically programmable memory. The system provides multiple resets to a CAM for proper operation with multiple power supply levels. The system also provides a CAM that allows access to redundant addresses of an electrically programmable read only memory (EPROM) and that allows programming of the EPROM with traditional programming equipment.

REFERENCES:
patent: 5136544 (1992-08-01), Rozman
patent: 5197034 (1993-03-01), Fandrich
patent: 5265052 (1993-11-01), D'Arrigo
patent: 5267213 (1993-11-01), Sung

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