Data transfer control device, electronic instrument, and data transfer control method
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United States of America Patent
Stats
-
May 15, 2007
Grant Date -
Dec 25, 2003
app pub date -
Mar 6, 2003
filing date -
Mar 20, 2002
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Data to be transferred from a BUS1 (IEEE 1394 or USB) is encrypted by a second encryption process (DES) and the encrypted data is written to an external SDRAM through an external terminal of a data transfer control device. The encrypted data that has been written to the SDRAM is read through the external terminal, and the thus-read encrypted data is transferred to a BUS2 to which an HDD is connected. Encrypted data transferred from the BUS1 is decrypted by a first decryption process (DTCP), and is written to a small-capacity SRAM within the data transfer control device. The thus-written decrypted data is read from the SRAM and encrypted by the second encryption process. Paths that bypass the second encryption (or decryption) are also provided.
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