Texas Instruments OMAP5910 Reference Manual page 184

DSP DMA
184 DSP Subsystem
Valid values for the element index are:
[4 x N] + 1 (where N = ...−2, −1, 0, 1, 2...) if the data type is 32-bit
-
[2 x N] + 1 (where N = ...−2, −1, 0, 1, 2...) if the data type is 16-bit
-
Any value if the data type is 8-bit
-
As with the element index, the frame index must produce an aligned address
according to the data type selected in the DATATYPE field of DMACSDP. Valid
values for the frame index are:
[4 x N] + 1 (where N = ...−2, −1, 0, 1, 2...) if the data type is 32-bit
-
[2 x N] + 1 (where N = ...−2, −1, 0, 1, 2...) if the data type is 16-bit
-
Any value if the data type is 8-bit
-
The start address, element index, and frame index must produce valid
addresses within the range of the port. If an invalid address is generated, a
timeout error will occur.
If the DSP core attempts to load an index register with an element or a frame
index that would cause an unaligned address, the DMA controller will send a
bus error interrupt (BERRINT) request to the DSP core. This occurs even if
address indexing is not used.
The index registers are summarized by Figure 90 and Table 73−Table 76. All
of the element index and frame index registers are uninitialized after a DSP
subsystem reset.
SPRU890A