Computer system and an electronic circuit utilizing a single DMA controller and additional communication circuit to manage DMA transfers between memory and I/O devices
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United States of America Patent
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Dec 8, 1998
Issued Date -
N/A
app pub date -
Jan 22, 1997
filing date -
Dec 22, 1994
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A computer system (6,7) includes first and second I/O circuits (932, 934), first and second buses (904, 83) respectively coupled to the first and second I/O circuits (932, 934), a memory (106), a third bus (104) coupled to the memory (106), and first and second bus interface circuits (902, 6920) connected between the third bus (104) and the first and second buses (904, 83) respectively. A direct memory access (DMA) controller (910) is coupled to the first bus (904) and to the first bus interface circuit (906), and a serial communications circuit (7010, 6910, 7020) is connected between the DMA controller (910) and the second bus interface circuit (6920). As an example, in the present invention a single DMA controller may be used to provide DMA capability to both a notebook computer and a docking station, using an interface between the notebook computer and the docking station to transfer DMA station. Other devices, systems and methods are also disclosed.
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