Data_Type Bit - Texas Instruments OMAP5912 Reference Manual

Multimedia processor device overview and architecture

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DATA_TYPE Bit

Direct Memory Access (DMA) Support

DATA_TYPE: Defines the type of the data moved in the channel; used for

endianism adaptation.

The DMA controller makes 8-bit accesses at the source and at the

destination of the channel. The source and destination start address-

es have no alignment constraint, as follows:

Start address: XXXX XXXX XXXX XXXXb (X can be 0 or 1). If the auto-

matic post-incremented addressing mode is chosen at the source or

the destination, the corresponding address is updated by an incre-

ment of 1 after each element transfer.

The DMA controller makes 16-bit accesses at the source and at the

destination. The source and destination start addresses must each be

on an even 2-byte boundary; the least significant bit (LSB) must be 0

Start address: XXXX XXXX XXXX XXX0b (X can be 0 or 1). If the auto-

matic post-incremented addressing mode is chosen at the source or

the destination, the address is updated by an increment of 2 after each

element transfer.

The DMA controller makes 32-bit accesses at the source and at the

destination. The source and destination start addresses must be on

an even 4-byte boundary; the 2 LSBs must be 0 as follows:

Start address: XXXX XXXX XXXX XX00b (X can be 0 or 1). If the auto-

matic post-incremented addressing mode is chosen at the source or

the destination, the address is updated by an increment of 4 after each

element transfer.

11b Reserved (do not use)

Programmers Responsibility

It is the responsibility of the programmer to ensure that the start

address is aligned with the channel DATA_TYPE.

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