OTG device IN endpoint 1 interrupt register
| XFRC | Transfer completed interrupt This field indicates that the programmed transfer is complete on the AHB as well as on the USB, for this endpoint. |
| EPDISD | Endpoint disabled interrupt This bit indicates that the endpoint is disabled per the applications request. |
| AHBERR | AHB error This is generated only in internal DMA mode when there is an AHB error during an AHB read/write. The application can read the corresponding endpoint DMA address register to get the error address. |
| TOC | Timeout condition Indicates that the core has detected a timeout condition on the USB for the last IN token on this endpoint. |
| ITTXFE | IN token received when Tx FIFO is empty Indicates that an IN token was received when the associated Tx FIFO (periodic/non-periodic) was empty. This interrupt is asserted on the endpoint for which the IN token was received. |
| INEPNM | IN token received with EP mismatch Indicates that the data in the top of the non-periodic TxFIFO belongs to an endpoint other than the one for which the IN token was received. This interrupt is asserted on the endpoint for which the IN token was received. |
| INEPNE | IN endpoint NAK effective This bit can be cleared when the application clears the IN endpoint NAK by writing to the CNAK bit in OTG_DIEPCTLx. This interrupt indicates that the core has sampled the NAK bit set (either by the application or by the core). The interrupt indicates that the IN endpoint NAK bit set by the application has taken effect in the core. This interrupt does not guarantee that a NAK handshake is sent on the USB. A STALL bit takes priority over a NAK bit. |
| TXFE | Transmit FIFO empty This interrupt is asserted when the Tx FIFO for this endpoint is either half or completely empty. The half or completely empty status is determined by the Tx FIFO Empty Level bit in the OTG_GAHBCFG register (TXFELVL bit in OTG_GAHBCFG). |
| TXFIFOUDRN | Transmit Fifo Underrun (TxfifoUndrn) The core generates this interrupt when it detects a transmit FIFO underrun condition for this endpoint. Dependency: This interrupt is valid only when Thresholding is enabled |
| PKTDRPSTS | Packet dropped status This bit indicates to the application that an ISOC OUT packet has been dropped. This bit does not have an associated mask bit and does not generate an interrupt. |
| NAK | NAK input The core generates this interrupt when a NAK is transmitted or received by the device. In case of isochronous IN endpoints the interrupt gets generated when a zero length packet is transmitted due to unavailability of data in the Tx FIFO. |