Data processing apparatus
First Claim
Patent Images
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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Abstract
A data processing apparatus serves as I/O units coupled to information processes apparatuses such as computers. The data processing apparatus decodes encrypted data and performs processing according to message data. The data processing apparatus includes a data processing circuit performing decoding processing and message processing according to message data, a data buffer accessible from both the data processing circuit and the information processing apparatus, a data buffer monitor circuit monitoring states of read/write of the data to the data buffer, and an access control circuit controlling an access from the information processing apparatus to the data buffer.
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Citations
14 Claims
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1. A data processing apparatus comprising:
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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. - View Dependent Claims (2, 3)
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4. A data processing apparatus comprising:
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a data processing circuit executing a processing according to message data requesting the processing; 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 an access control circuit controlling an access from said information processing apparatus to said data buffer, wherein said data processing circuit reads out message data written into said data buffer from said information processing apparatus and executes the processing according to the message data thus read out, and when executing the processing according to the message data, instructs said access control circuit to inhibit an access from said information processing apparatus to said data buffer. - View Dependent Claims (5, 6, 7, 8, 9, 10)
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11. A data processing apparatus comprising:
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a data processing circuit executing processing according to message data requesting the processing; and 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, wherein said data processing circuit comprises a local memory accessible from said data processing circuit but unaccessible from said information processing apparatus, and said data processing circuit transfers to said local memory at least a part of message data written into said data buffer from said information processing apparatus, and then executes the processing according to the message data. - View Dependent Claims (12, 13)
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14. A data processing apparatus comprising:
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a data processing circuit performing decoding processing in which encrypted data is decoded, and message processing according to message data requesting the processing; 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; 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; and an access control circuit controlling an access from said information processing apparatus to said data buffer, wherein said data processing circuit performs a first processing of reading out encrypted data written into said data buffer from said information processing apparatus and writing the data thus read into said data buffer through practicing a decoding processing, a second processing of reading out message data written into said data buffer from said information processing apparatus and practicing a decoding processing to the message data thus read, and when executing the second processing, instructs said access control circuit to inhibit an access from said information processing apparatus to said data buffer.
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Specification