endpoint 0 register
| EA | Endpoint address |
| STAT_TX | Status bits, for transmission transfers |
| DTOG_TX | Data Toggle, for transmission transfers |
| CTR_TX | Correct Transfer for transmission |
| EP_KIND | Endpoint kind |
| EP_TYPE | Endpoint type |
| SETUP | Setup transaction completed |
| STAT_RX | Status bits, for reception transfers |
| DTOG_RX | Data Toggle, for reception transfers |
| CTR_RX | Correct transfer for reception |