RM0390 Rev 4 1223/1328
RM0390 USB on-the-go full-speed/high-speed (OTG_FS/OTG_HS)
1264
packet size), starting with an odd frame. (transfer size = 1 024 bytes).
– The periodic transmit FIFO can hold one packet (1 KB).
– Periodic request queue depth = 4.
The sequence of operations is as follows:
1. Initialize and enable channel 1. The application must set the ODDFRM bit in
OTG_HCCHAR1.
2. Write the first packet for channel 1.
3. Along with the last word write of each packet, the OTG_FS/OTG_HS host writes an
entry to the periodic request queue.
4. The OTG_FS/OTG_HS host attempts to send the OUT token in the next frame (odd).
5. The OTG_FS/OTG_HS host generates the XFRC interrupt as soon as the last packet
is transmitted successfully.
6. In response to the XFRC interrupt, reinitialize the channel for the next transfer.
7. Handling non-ACK responses
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