Compact disk data transfer system using cache memory
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United States of America Patent
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Nov 9, 1993
Grant Date -
N/A
app pub date -
Oct 31, 1991
filing date -
Oct 31, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Method and apparatus for continuously reading data from a compact disk drive to a host computer is disclosed in which the data is transferred to the computer's cache memory so that it is available to the computer's central processor for processing without interruption. A communication link is established between a processor in the disk drive and a direct memory access (DMA) controller in the host computer. With this link established, the DMA controller directs the transfer of the incoming data stream from the drive to the cache memory of the host computer. Once the data is in the cache memory, it is moved to the application workspace of the computer's system random access memory (RAM) for processing by the central processor. The transfer of data by the DMA controller, and the temporary storage of the transferred data in the cache memory, allows for continuous transfer of data from the compact disk drive, without interruption, and without the need for reseeks of the data. The invention is implemented in software by executing a software call from a supervisory program operating in the host computer.
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