Logical Channel Types - Texas Instruments OMAP5912 Reference Manual

Multimedia processor device overview and architecture

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Logical Channel Types

The OMAP system DMA is based on logical channels (LChs).

Each generic LCh can be configured to one of four different logical channel

types; the dedicated LCD LCh can only be configured to LCh type D.

Logical channel types (LCh types) supported are:

LCh-2D for nonsynchronized transfers (memory transfers, 1D and 2D)

LCh-P for synchronized transfers (mostly peripheral transfers)

LCh-PD similar to LCh-P but runs on a dedicated physical channel

LCh-G for graphical transfers/operations

LCh-D for display transfers

The logical channel dedicated for the display, LCh-D, must be configured to

LCh type LCh-D.

Each logical channel type represents a specific subset of the system DMA

features list. Even if the requirements of a specific transfer can fit into several

LCh-types, it is important to select the correct LCh-type. Table 16 summarizes

features per logical channel type.

Direct Memory Access (DMA) Support

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