DV=DATA_IS_INVALID_
USB Receive Packet Length
| PKT_LNGTH | The remaining number of bytes to be read from the currently selected endpoint’s buffer. When this field decrements to 0, the RxENDPKT bit will be set in USBDevIntSt. |
| DV | Data valid. This bit is useful for isochronous endpoints. Non-isochronous endpoints do not raise an interrupt when an erroneous data packet is received. But invalid data packet can be produced with a bus reset. For isochronous endpoints, data transfer will happen even if an erroneous packet is received. In this case DV bit will not be set for the packet. 0 (DATA_IS_INVALID_): Data is invalid. 1 (DATA_IS_VALID_): Data is valid. |
| RESERVED | Reserved, user software should not write ones to reserved bits. The value read from a reserved bit is not defined. |