Texas Instruments OMAP5910 Reference Manual page 177

Table 66. DMA Source and Destination Parameters Register (DMACSDP)
Field Descriptions (Continued)
Bits Field
6 SRCPACK
5−2 SRC
SPRU890A
Value Description
Source packing enable bit. The DMA controller can perform data
packing to double or quadruple the amount of data gathered at the
source before a transfer. For example, if an 8-bit data type is selected
and the source port has a 32-bit data bus, four 8-bit pieces of data can
be packed into 32 bits before being sent through the channel.
SRCPACK determines whether data packing is used at the source
port.
0 Packing disabled at the source.
1 Packing enabled at the source. Where possible, the DMA controller
packs data from the source before beginning a data transfer in the
channel. Table 48 shows the instances where data packing is
performed.
Source selection bits. SRC selects which DMA port is the source for
data transfers in the channel.
0000b SARAM (single-access RAM inside the DSP subsystem).
0001b DARAM (dual-access RAM inside the DSP subsystem).
0010b External memory (via the external memory interface, EMIF).
Internally, 8-bit data read requests from the DSP external memory are
converted to 16-bit data read requests by the EMIF. The appropriate
byte is fetched from this read request and placed in internal memory.
0011b Peripherals (via the shared TI peripheral bus bridge). Connection of
a channel configured to have an 8-bit data type to the peripheral port
is not supported.
Others Reserved.
DSP DMA
DSP Subsystem 177