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Semiconductor storage apparatus

  • US 7,251,179 B2
  • Filed: 03/30/2005
  • Issued: 07/31/2007
  • Est. Priority Date: 08/31/2004
  • Status: Expired due to Fees
First Claim
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1. A semiconductor storage apparatus, comprising:

  • floating body cells (FBCs) which need refresh operation;

    a refresh control circuit which terminates an on-going refresh operation when an external access for reading out from or writing into the FBCs is requested;

    a first time measuring unit which measures a first period after the refresh operation is begun, until the next refresh operation is begun afterwards;

    a second time measuring unit which measures a second period necessary for the refresh operation; and

    an address generator which generates addresses of the FBCs for the refresh operation,wherein the refresh control circuit controls a timing of the refresh operation based on the outputs of the first and second time measuring units and an external access request signal.

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