Autoinitialization - Texas Instruments OMAP5912 Reference Manual

Multimedia processor device overview and architecture

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Autoinitialization

Direct Memory Access (DMA) Support

All of the transfers can be synchronized to DMA requests, whatever their

sources and destinations.

The DMA requests come from signals PENDMAREQ(19:0) located on the

DSP boundary. One DMA request can trigger several channels at the same

A DMA channel (synchronized or not) can operate in two modes: Single

transfer mode and autoinitialization mode.

In single transfer mode, the channel stops when the current transfer

In autoinitialization mode, the channel loads a new configuration and

automatically restarts a new transfer when the current one finishes.

A DMA channel has two sets of configuration registers: the programming set

and the active set. Only the programming set is accessible to users (through

the TIPB bus). When a channel is enabled for the first time, or when a channel

autoinitializes, the programming set is copied in the active set of registers.

Users can then program the programming set to configure the next transfer

while the current one is running.

This feature can be used in two ways:

Continuous operation: Users can change the programming registers while

the current configuration is executed. The next transfer is performed with

a new context, but without stopping the DMA.

Repetitive operation: Users never modify the programming registers. The

same context is always used.

The programming set includes the following registers:

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