DTB5_DIG_ENG register
| RXTX_START_SEL | enable the possibility to control some signals by the other register bits instead of system design: |
| TX_ACTIVE | Force TX_ACTIVE signal |
| RX_ACTIVE | Force RX_ACTIVE signal |
| INITIALIZE | Force INITIALIZE signal (emulate a token request of the IP_BLE) |
| PORT_SELECTED_EN | enable port selection |
| PORT_SELECTED_0 | force port_selected[0] signal |