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Rabbit 6000 User’s Manual
digi.com
252
Normally all DMA transfers are flow-through, meaning that the DMA does separate read and write trans-
actions to transfer the data. However, the Rabbit 6000 DMA also contains dedicated buses to support fly-
by transactions to and from certain internal I/O addresses on the Ethernet, Wi-Fi, and USB peripherals. A
fly-by transfer looks like a single transaction on the internal and external bus, where data are transferred
directly to/from the peripheral from/to a memory device. The DMA automatically recognizes internal I/O
addresses that support fly-by transfers.
Operating the DMA with the USB peripheral is complicated by the fact that the USB controller needs
access to a number of different data streams to and from memory. There is a special control field in
DxSCR to identify the two DMA channels dedicated to the USB controller, one for reading from memory
and one for writing to memory. Only one channel can be enabled for each direction at a time. No other
DMA programming is required for the two DMA channels dedicated to the USB controller as the control-
ler handles all the other setup.
24.1.1 Block Diagram
Summary of Contents for 6000
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