Interfacing external device with Avalon/DMA

Nios® V/II Embedded Design Suite (EDS)

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Interfacing external device with Avalon/DMA

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Hi guys,

I have to interface an external device (an USB peripheral controller ISP1181) with NIOS II Avalon bus.

This device supports DMA transfers in 2 modes: 8237 compatible mode and "DACK-only" mode.

I don't know how to connect this device with Avalon bus :-(

What do I have to do with DREQ, DACK and EOT signals from my device ?

Are there signals on Avalon bus where I have to connect them ?

Do I have to connect DMA read_master and write_master ports with the device data bus and the RAM data bus ? (I think so)

How can I also have acces to the device registers ?

Do I have to add a second port to my SOPC Builder component to have acces to device registers ?

Thanks for any help.

PS: I use NIOS II 5.0 and Quartus II 5.0 with Service Pack 1 installed.

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