Texas Instruments OMAP5910 Reference Manual page 148

DSP DMA
Table 52. DSP GDMA Handler Input Request Lines (Continued)
Input Request Line
PERIPH_REQ19
PERIPH_REQ20
PERIPH_REQ21
PERIPH_REQ22
PERIPH_REQ23
PERIPH_REQ24
PERIPH_REQ25
PERIPH_REQ26
PERIPH_REQ27
PERIPH_REQ28
7.2.13.2 Configuration
148 DSP Subsystem
Generated By:
UART3 Receive Request (UART3RX)
CMT-APE Transmit Request , channel 1 (CMTAPE1TX)
CMT-APE Receive Request, channel 1 (CMTAPE1RX)
CMT-APE Transmit Request, channel 2 (CMTAPE2TX)
CMT-APE Receive Request, channel 2 (CMTAPE2RX)
NAND Flash End of Burst (NANDEB)
SPI Transmit Request (SPITX)
SPI Receive Request (SPIRX)
McBSP2 Transmit Request (McBSP2TX)
McBSP2 Receive Request (McBSP2RX)
Each peripheral request can be mapped to a specific DMA synchronization
event through the Functional Multiplexing DSP DMA registers. Each register
contains a 5-bit field associated with each DMA synchronization event. The
value written to this field represents the peripheral request associated with that
synchronization event.
To associate a specific peripheral request with a DMA event, follow these
steps:
1) Using Table 53, identify which functional multiplexing register controls the
desired DMA event.
2) Determine the number of the peripheral request you want to associate with
the DMA event using Table 52.
3) Write the peripheral request number as n-1, not n, to the bit field for the
desired DMA event within the functional multiplexing register.
For example, to associate the McBSP3 transmit request with DMA event
number 6 (DMA_EVT6), write 0x09 to the CONF_DSP_DMA_EVT_06 field of
the FUNC_MUX_DSP_DMA_A register.
After reset, the OMAP5912 DSP GDMA Handler is configured to the default
configuration shown in Table 51. However, the handler gives you the flexibility
to specify the peripheral request associated with each of the 19 DMA events
according to your application task requirements.
SPRU890A