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Data processing apparatus

  • US 5,953,416 A
  • Filed: 03/20/1997
  • Issued: 09/14/1999
  • Est. Priority Date: 11/12/1996
  • Status: Expired due to Term
First Claim
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1. A data processing apparatus comprising:

  • a data processing circuit decoding encrypted data;

    a data buffer connected to an external information processing apparatus, said data buffer being accessible from both said data processing circuit and said information processing apparatus; and

    a data buffer monitor circuit informing said data processing circuit, when a write-in of data from said information processing apparatus into said data buffer occurs, of the fact that the write-in of data has occurred, and informing said information processing apparatus, when a write-in of data from said data processing circuit into said data buffer occurs, of the fact that the write-in of data has occurred.

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