Texas Instruments OMAP5912 Reference Manual page 1389

System software must not program RXDMAx_EP to endpoint numbers
that are not configured as DMA endpoints.
Table 48. DMA Transmit Channels Configuration Register (TXDMA_CFG)
Bit Name
15:13 Reserved
12 TX_REQ
11:8 TXDMA2_EP
SPRU761A
Description
Reserved
The TX DMA request active level or pulse bit allows the TXDMA request to be
configurable level or pulse-sensitive. When pulse-sensitive, the request is active
for two cycles.
0: TX DMA request active level
1: TX DMA request active pulse
Value after MPU or USB reset is low.
Transmit endpoint number for DMA channel 2: the endpoint number binary
encoded in these four bits is the current transmit endpoint selected for DMA
channel 2. A zero value indicates that the DMA channel 2 is deactivated. Any
other value automatically enables transmit DMA transfer for the selected
endpoint.
0000: Transmit DMA channel 2 is deactivated.
0001: EP1
...
1111: EP15
Values after MPU or USB reset are low (all four bits).
USB Device Controller
Universal Serial Bus (USB) 97