Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 21, 2009
Patent Application Number
11237972
Date Filed
September 29, 2005
Patent Primary Examiner
Patent abstract
An I/O controller to which an I/O device is connected includes a DMA controller (DMAC) and an access control unit (ACU). The DMAC executes DMA transfer in accordance with data transfer control information set in a control/status register by a user process. The ACU limits execution of DMA transfer by the DMAC based on access control information set in a control/status register by a privileged process, and disables the DMAC from accessing any memory area other than the memory area that can be accessed by the user process.
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