Method and apparatus for implementing a single DMA controller to

Details Method and apparatus for implementing a single DMA controller to Method and apparatus for implementing a single DMA controller to

1994-12-22

1998-11-10

Harvey, Jack B.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

395309, 361683, G06F 1314

Patent

active

058357335

ABSTRACT:
A computer system (6,7) includes first and second I/O circuits (932, 934), 51, 97 first and second buses (904, 83) respectively coupled to the first and second I/O circuits (932, 934), 51, 97 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 (902), 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 related information between the DMA controller and a requesting device in the docking station. Other devices, systems and methods are also disclosed.

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