EZ-USB FX3 Technical Reference Manual, Document Number: 001-76074 Rev. *F 77
FX3 DMA Subsystem
5.8 Concept of DMA Channels
A DMA channel is a software construct that encapsulates all of the DMA elements used (discussed so far in this chapter) in a
single data flow. The DMA manager in the FX3 firmware library introduces the notion of a DMA channel that encapsulates the
hardware resources such as sockets, buffers and descriptors used for handling a data flow through the device. The channel
concept is used to hide the complexity of configuring all of these resources in a consistent manner. The DMA manager
provides API functions that can be used to create data flows between any two interfaces on the FX3 device.
The DMA channel implementation where sockets can directly signal each other through events or can signal the FX3 CPU via
interrupts, when configured by firmware, is called automatic DMA channel. Alternatively, when there is CPU intervention as
explained in section DMA Features on page 58, it is called a manual DMA channel. For more details on DMA channels and
types of DMA channels supported, refer DMA Engine section in FX3 Programmer’s Manual.
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