×

Nonvolatile semiconductor memory device

  • US 6,751,122 B2
  • Filed: 02/21/2003
  • Issued: 06/15/2004
  • Est. Priority Date: 10/30/2002
  • Status: Expired due to Term
First Claim
Patent Images

1. A nonvolatile semiconductor memory device, comprising:

  • a memory cell array containing a plurality of nonvolatile memory cells and an initial setup data region in which initial setup data specified to determine operation conditions of the device is to be written;

    a detection circuit which detects turn-on of power;

    a readout circuit which reads out the initial setup data from the initial setup data region of the memory cell array upon detecting power-on by the detection circuit;

    a determination circuit which determines whether the initial setup data read out by the readout circuit is effective or ineffective; and

    a setup circuit which sets up the device in an operative-prohibiting status when the initial setup data is determined as ineffective by the determination circuit.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×