Possible Dma Transfers - Texas Instruments OMAP5910 Technical Reference Manual

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DMA Controller

Table 3–3. Possible DMA Transfers

Data transfers among the SARAM, DARAM, EMIF, and PERIPH ports can

occur in six independent DMA channels. Transfers between the MPUI port and

memory ports (SARAM, DARAM, and EMIF) occur on a unique seventh chan-

nel dedicated to MPU operations. Transfers between the MPU and DSP

peripherals are supported by a direct connection that does not involve the DSP

DMA controller (see Section 3.6, MPU Interface). Each channel is controlled

by a set of configuration registers, where software sets up the transfer

parameters, such as length, source address, and destination address. These

registers are accessed in I/O space by the DSP via the TIPB bridge.

It is possible for multiple channels (or for one or more channels and the MPUI)

to request access to the same standard port at the same time (see Table 3–3

and Figure 3–8). To arbitrate simultaneous requests, the DMA controller has

one programmable service chain that is used by each of the standard ports.

The complete operation of the OMAP5910 DSP DMA controller is described

in detail in the Direct Memory Access (DMA) Controller section of the

TMS320C55x Peripherals Reference Guide (literature number SPRU317).

The OMAP5910 DSP DMA controller is consistent with SPRU317 with the

following exceptions and clarifications:

All references to EHPI (enhanced host port interface) are equivalent to

MPUI (MPU interface) on OMAP5910.

References to the EHPI_PRIO and EHPI_EXCL bits in the DMA_GCR

Clarification of DMA channel syncronization is described in Section 3.4.2.

MPU transfers data to and from DSP peripherals via direct connection.