Updating Addresses In A Channel - Texas Instruments OMAP5912 Reference Manual

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High-Level I/O Map for DSP

Updating Addresses in a Channel

Direct Memory Access (DMA) Support

Word addresses

(Hexadecimal range)

During data transfers in a DMA channel, the DMA controller begins its read and

write accesses at the start addresses you specify (as described in Section 4.6,

Start Addresses in a Channel). In many cases these addresses must be

updated after a data transfer has begun so that data is read and written at

consecutive or indexed locations. The address updates can be configured at

Block-level address updates. In the autoinitialization mode (AUTO_INIT

= 1 in DMA_CCR), block transfers can occur one after another until

autoinitialization is turned off or the channel is disabled. To start different

addresses for the block transfers, update the start addresses between the

block transfers.

Element-level address updates. The DMA controller can update the

source address and/or the destination address after each element

transfer. Ensure that the source address points to the start of the next

element, and that the element is precisely positioned at the destination.

Choose an addressing mode for the source with the SRC_AMODE bits in

DMA_CCR. Choose an addressing mode for the destination with the

DST_AMODE bits in DMA_CCR.

Byte addresses

(Hexadecimal range)

0 0000-1 FFFF

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