RM0390 Rev 4 1237/1328
RM0390 USB on-the-go full-speed/high-speed (OTG_FS/OTG_HS)
1264
6. As soon as the packet is received successfully, the OTG_HS host starts writing the
data to the system memory.
7. The OTG_HS host generates the CHH interrupt after transferring the received data to
the system memory.
8. In response to the CHH interrupt, de-allocate or reinitialize the channel for the next start
split.
• Isochronous OUT split transactions in DMA mode
The sequence of operations (channel x) is as follows:
1. Initialize and enable channel x for start split (begin) as explained in Section : Channel
initialization. The application must set the ODDFRM bit in OTG_HCCHAR1. Program
the MPS field.
2. The OTG_HS host starts reading the packet.
3. After successfully transmitting the start split (begin), the OTG_HS host generates the
CHH interrupt.
4. In response to the CHH interrupt, reinitialize the registers to send the start split (end).
5. After successfully transmitting the start split (end), the OTG_HS host generates a CHH
interrupt.
6. In response to the CHH interrupt, de-allocate the channel.
• Isochronous IN split transactions in DMA mode
The sequence of operations (channel x) is as follows:
1. Initialize and enable channel x for start split as explained in Section : Channel
initialization.
2. The OTG_HS host writes an IN request to the request queue as soon as channel x
receives the grant from the arbiter.
3. The OTG_HS host attempts to send the start split IN token at the beginning of the next
odd micro-frame.
4. The OTG_HS host generates the CHH interrupt after successfully transmitting the start
split IN token.
5. In response to the CHH interrupt, set the COMPLSPLT bit in OTG_HCSPLT2 to send
the complete split.
6. As soon as the packet is received successfully, the OTG_HS host starts writing the
data to the system memory.
The OTG_HS host generates the CHH interrupt after transferring the received data to
the system memory. In response to the CHH interrupt, de-allocate the channel or
reinitialize the channel for the next start split.
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