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Need help on PCI master transcation

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jeevs

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Dear friends,

In an AMBA bus system PCI is a device attached on the bus.I read that few people are using single channel DMA as a part of the PCI component for master memory transaction.Why is this single Channel DMA is used as a part of the PCI.One end of the PCI is connected to the host bus the other end where the DMA interface is present sits on the AMBA bus.Why is this?
What is the difference between using the DMA for doing the PCI transcation on the AMBA bus and the direct PCI master transcation.

Please help.

Thanks and Regards,
Jeev
 

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