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Flash memory card including plural flash memories and circuitry for selectively outputting ready/busy signals in different operating modes

  • US 5,388,248 A
  • Filed: 02/16/1994
  • Issued: 02/07/1995
  • Est. Priority Date: 03/31/1992
  • Status: Expired due to Term
First Claim
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1. A flash memory card, comprising:

  • (A) a plurality of flash memories with a respective plurality of first ready/busy outputs, wherein each ready/busy output of the plurality of ready/busy outputs indicates whether a respective flash memory of the plurality of flash memories is ready or busy;

    (B) register circuitry for storing mask data;

    (C) mode circuitry for choosing one of a first mode and a second mode, wherein a first mode signal is produced if the first mode is chosen, and wherein a second mode signal is produced if the second mode is chosen;

    (D) logic circuitry for performing logical operations with respect to the plurality of ready/busy outputs and the mask data in accordance with which one of the first mode signal and the second mode signal is produced(1) to produce a ready signal output for the flash memory card only if all the plurality of flash memories are ready if the first mode is chosen;

    (2) to produce a ready signal output for the flash memory card each time any flash memory of the plurality of flash memories goes from being busy to being ready if the second mode is chosen.

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