OTG_FS device control IN endpoint 0 control register (OTG_FS_DIEPCTL0)
| MPSIZ | Maximum packet size  |  
| USBAEP | USB active endpoint  |  
| NAKSTS | NAK status  |  
| EPTYP | Endpoint type  |  
| STALL | STALL handshake  |  
| TXFNUM | TxFIFO number  |  
| CNAK | Clear NAK  |  
| SNAK | Set NAK  |  
| EPDIS | Endpoint disable  |  
| EPENA | Endpoint enable  |