Non-volatile, static random access memory with high speed store

Details Non-volatile, static random access memory with high speed store Non-volatile, static random access memory with high speed store

1998-09-30

2000-08-01

Le, Vu A.

Static information storage and retrieval

Floating gate

Particular connection

365154, G11C 1140

Patent

active

060976292

ABSTRACT:
The invention relates to a non-volatile, static random access memory (nvSRAM) device that is capable of high speed copying of the data in the static random access portion of the device into the non-volatile portion of the device after the detection of possible loss of power. This is accomplished by preparing the non-volatile portion for receiving a bit of data from the SRAM portion before the possible loss of power is detected, i.e., pre-arming the device. In one embodiment, the pre-arming is accomplished by erasing the non-volatile portion during the time when the power supply is stable and data can be transferred between the SRAM portion and the exterior environment. In another embodiment, pre-arming is accomplished by erasing the non-volatile portion immediately after power has been provided to the device and data from the non-volatile portion has been copied into the SRAM in a recall operation. Another aspect of the invention provides for the decoupling of the erase and store operations. This facilitate, for example, the erase of the data in the non-volatile portion of the nvSRAM without a subsequent copying of data in the SRAM portion into the non-volatile portion.

REFERENCES:
patent: 5065362 (1991-11-01), Herdt et al.
patent: 5311470 (1994-05-01), Atsumi et al.
patent: 5523971 (1996-06-01), Rao

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