Postage meter with a non-volatile memory security circuit

Details Postage meter with a non-volatile memory security circuit Postage meter with a non-volatile memory security circuit

1989-03-03

1991-03-05

Lall, Parshotam S.

Boots, shoes, and leggings

371 62, 371 671, 235382, G06F 1214

Patent

active

049982036

ABSTRACT:
An electronic postage meter with a non-volatile memory security circuit apparatus is disclosed. The security circuit comprises means for limiting the amount of time the memories may be continuously enabled, means for preventing simultaneous enabling of both memories and means for preventing the write enabling of a memory if the write enable signal is active before a memory select signal is active. The circuit prevents memory access when a conflict is sensed across in an output related to the non-volatile memories. The security circuit provides additional protection to the non-volatile memory so that valuable critical accounting information located therein cannot be modified or destroyed.

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