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Write and erase protection in a synchronous memory

  • US 6,819,622 B2
  • Filed: 01/21/2004
  • Issued: 11/16/2004
  • Est. Priority Date: 08/25/2000
  • Status: Expired due to Term
First Claim
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1. A non-volatile memory device comprising:

  • data connections that are compatible with a synchronous dynamic random access memory;

    a non-volatile memory array coupled to the data connections;

    a programmable, volatile register to store protection data;

    non-volatile register, coupled to the volatile register, to store default protection data;

    a voltage detector to determine if a memory power supply voltage drops below a predetermined level; and

    control circuitry to program the protection data and read the volatile and non-volatile registers and prevent erase or write operations to the memory array in response to the read protection data.

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