DMA controller connected to master and slave device wherein...

Details DMA controller connected to master and slave device wherein... DMA controller connected to master and slave device wherein...

2006-02-23

2008-11-25

Peyton, Tammara (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Direct memory accessing

C710S008000, C710S009000, C710S023000, C710S110000

Reexamination Certificate

active

07457891

ABSTRACT:
A DMA controller is connected by a bus to a plurality of master devices and a plurality of slave devices, and performs a data transfer between slave devices which are specified as a source and a destination of the data transfer by a transfer condition received from any of the plurality of master devices. Each of the plurality of master devices and the plurality of slave devices has a rank used for judging data transfer permissibility. The DMA controller enables the data transfer if the data transfer is judged to be permitted as a result of a comparison between a rank of the master device and a rank of any of the specified slave devices, and disables the data transfer if the data transfer is judged to be prohibited.

REFERENCES:
patent: 6772254 (2004-08-01), Hofmann et al.
patent: 7139909 (2006-11-01), Lee
patent: 7246185 (2007-07-01), Pritchard et al.
patent: 2001-297054 (2001-10-01), None

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