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EP0278392A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Non-volatile memory system

Assignee: Motorola Solutions Inc
•
Filing: 1988-02-04
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Granted: —
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Expires: 2008-02-04
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Abstract

Abstract A memory system comprising a first, volatile memory (6) having a plurality of memory cells; at least one second, non-volatile memory (E l -E n ) having a plurality of memory cells; power-down means (12) for sensing when power is withdrawn from the first memory and for transferring in response thereto contents of the cells of the first memory to the cells of the second memory; and power-up means (10) for sensing when power is applied to the first memory and for transferring in response thereto contents of the cells of the second memory to the cells of the first memory, is characterised by a plurality of said second, non-volatile memories and further comprising a register (8) for holding an indication of which of the second memories is to be used for transfer by at least the power-down means.

Inventors

  • 👤 Pierre Guillot

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 08:45
CPC Classifications
G; G11; G11C; G11C14/00

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 148 words
A memory system (2) comprising a first, volatile memory (6) having a plurality of memory cells; at least one second, non-volatile memory (E l -E n ) having a plurality of memory cells; power-down means (12) for sensing when power is withdrawn from the first memory (6) and for transferring in response thereto contents of the cells of the first memory to the cells of the second memory; and power-up means (10) for sensing when power is applied to the first memory (6) and for transferring in response thereto contents of the cells of the second memory to the cells of the first memory, characterised by a plurality of said second, non-volatile memories (E l -E n ) and further comprising a register (8) for holding an indication of which of the second memories is to be used for transfer by at least the power-down means, (12) .
Claim 2
Dependent Claim 148 words
A memory system (2) comprising a first, volatile memory (6) having a plurality of memory cells; at least one second, non-volatile memory (E l -E n ) having a plurality of memory cells; power-down means (12) for sensing when power is withdrawn from the first memory (6) and for transferring in response thereto contents of the cells of the first memory to the cells of the second memory; and power-up means (10) for sensing when power is applied to the first memory (6) and for transferring in response thereto contents of the cells of the second memory to the cells of the first memory, characterised by a plurality of said second, non-volatile memories (E l -E n ) and further comprising a register (8) for holding an indication of which of the second memories is to be used for transfer by at least the power-down means, (12) .
Claim 3
Dependent Claim 52 words
A memory system according to claim 1 wherein the register (8) is a non-volatile register and the power-up means (10) is arranged to use the indication held by the register to determine which of the second memories (E l -E n ) is to be used for transfer by the power-up means.
Claim 4
Dependent Claim 20 words
A memory system according to claim 1 wherein the power-up and power-down means transfer the contents of all cells simultaneously.

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