Texas Instruments OMAP5912 Reference Manual page 1476

USB Device Controller
Isochronous OUT (USB HOST −> MPU) DMA Transactions
Figure 41. ISO RX DMA Transaction
Host message
FIFO content
System DMA read
DMA_REQUEST
184 Universal Serial Bus (USB)
During ISO transfers to a DMA operated OUT endpoint, a request to the MPU
DMA controller is generated every 1-ms frame when an isochronous data
packet is received with no error. There is no interrupt associated with DMA
transfer to ISO OUT endpoints (see Figure 41 and Figure 42).
1ms
1 2
1 2
1 2
Error
3 4
3 4
3 4
6
6
6
SPRU761A