STMicroelectronics STM32F405 Reference Manual page 1272

USB on-the-go full-speed (OTG_FS)
Bit 14 ISOODRP: Isochronous OUT packet dropped interrupt
Note: Only accessible in device mode.
Bit 13 ENUMDNE: Enumeration done
Note: Only accessible in device mode.
Bit 12 USBRST: USB reset
Note: Only accessible in device mode.
Bit 11 USBSUSP: USB suspend
Note: Only accessible in device mode.
Bit 10 ESUSP: Early suspend
Note: Only accessible in device mode.
Bits 9:8 Reserved, must be kept at reset value.
Bit 7 GONAKEFF: Global OUT NAK effective
Note: Only accessible in device mode.
Bit 6 GINAKEFF: Global IN non-periodic NAK effective
Note: Only accessible in device mode.
Bit 5 NPTXFE: Non-periodic TxFIFO empty
Note: Accessible in host mode only.
Bit 4 RXFLVL: RxFIFO non-empty
Note: Accessible in both host and device modes.
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The core sets this bit when it fails to write an isochronous OUT packet into the RxFIFO
because the RxFIFO does not have enough space to accommodate a maximum size packet
for the isochronous OUT endpoint.
The core sets this bit to indicate that speed enumeration is complete. The application must
read the OTG_FS_DSTS register to obtain the enumerated speed.
The core sets this bit to indicate that a reset is detected on the USB.
The core sets this bit to indicate that a suspend was detected on the USB. The core enters
the Suspended state when there is no activity on the data lines for a period of 3 ms.
The core sets this bit to indicate that an Idle state has been detected on the USB for 3 ms.
Indicates that the Set global OUT NAK bit in the OTG_FS_DCTL register (SGONAK bit in
OTG_FS_DCTL), set by the application, has taken effect in the core. This bit can be cleared
by writing the Clear global OUT NAK bit in the OTG_FS_DCTL register (CGONAK bit in
OTG_FS_DCTL).
Indicates that the Set global non-periodic IN NAK bit in the OTG_FS_DCTL register
(SGINAK bit in OTG_FS_DCTL), set by the application, has taken effect in the core. That is,
the core has sampled the Global IN NAK bit set by the application. This bit can be cleared by
clearing the Clear global non-periodic IN NAK bit in the OTG_FS_DCTL register (CGINAK
bit in OTG_FS_DCTL).
This interrupt does not necessarily mean that a NAK handshake is sent out on the USB. The
STALL bit takes precedence over the NAK bit.
This interrupt is asserted when the non-periodic TxFIFO is either half or completely empty,
and there is space for at least one entry to be written to the non-periodic transmit request
queue. The half or completely empty status is determined by the non-periodic TxFIFO empty
level bit in the OTG_FS_GAHBCFG register (TXFELVL bit in OTG_FS_GAHBCFG).
Indicates that there is at least one packet pending to be read from the RxFIFO.
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