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Semiconductor memory device

  • US 5,043,946 A
  • Filed: 03/07/1990
  • Issued: 08/27/1991
  • Est. Priority Date: 02/09/1988
  • Status: Expired due to Term
First Claim
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1. In a semiconductor memory device comprising:

  • a volatile memory means;

    a non-volatile memory means;

    a mode switch means for selecting either mode of a volatile memory mode in which said memory device functions as a volatile memory device and a non-volatile memory mode in which said memory device functions as a non-volatile memory device; and

    a transfer means for transferring data between said volatile memory means and said non-volatile memory means in accordance with the mode selected by said switch means, the improvement existing in that said memory device further comprises a photoelectric conversion means for converting an optical signal applied thereon into an electric signal, said photoelectric conversion means being connected to said volatile memory means, said electric signal being stored in said volatile memory means.

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