Dual bus concurrent multi-channel direct memory access controller and method
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United States of America Patent
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Oct 27, 1998
Issued Date -
N/A
app pub date -
Mar 21, 1996
filing date -
Jan 28, 1994
priority date (Note) -
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Abstract
A direct memory access (DMA) controller is connected to the CPU bus of a computer system through a bus interface and is also connected to an I/O bus, which is coupled to one or more I/O controllers. Multiple channels, each corresponding to a particular I/O controller, are contained within the DMA controller. The DMA controller controls DMA transfers between the I/O controllers and the main memory of the system and allows multiple transfers to occur concurrently. The DMA controller controls transfers in part through a first arbiter which arbitrates requests for access to the CPU bus coming from the DMA channels and a second arbiter which arbitrates requests for access to the I/O bus coming from the DMA channels and the CPU.
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