Link descriptor configure and control register of Tx channel 0
| OUTLINK_STOP_CH | Set this bit to stop dealing with the outlink descriptors. |
| OUTLINK_START_CH | Set this bit to start dealing with the outlink descriptors. |
| OUTLINK_RESTART_CH | Set this bit to restart a new outlink from the last address. |
| OUTLINK_PARK_CH | 1: the outlink descriptor’s FSM is in idle state. 0: the outlink descriptor’s FSM is working. |