Direct memory access circuit and disk array device using same

Details Direct memory access circuit and disk array device using same Direct memory access circuit and disk array device using same

2005-09-30

2009-06-23

Patel, Niketa I (Department: 2181)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S001000

Reexamination Certificate

active

07552249

ABSTRACT:
A DMA circuit prevents an erroneous data transfer by a descriptor due to an address failure of memory. When a descriptor is created, the data processing unit writes a pointer, for storing the descriptor, in a predetermined part of the descriptor, and stores the descriptor in memory, and when a DMA engine reads the descriptor from the memory, the DMA engine confirms whether the value is correct, and judges whether a DMA transfer of the data in the memory is possible. For both reading and writing of a descriptor, data corruption due to an address failure can be prevented.

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Office Action issued in corresponding Chinese Patent Application No. 2005100776884, on Jun. 1, 2007.

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