congigure digital power isolation
| FORCE_OFF | No public |
| FORCE_ON | No public |
| DG_PAD_AUTOHOLD | read only register to indicate digital pad auto-hold status |
| CLR_DG_PAD_AUTOHOLD | wtite only register to clear digital pad auto-hold |
| DG_PAD_AUTOHOLD_EN | digital pad enable auto-hold |
| DG_PAD_FORCE_NOISO | digital pad force no ISO |
| DG_PAD_FORCE_ISO | digital pad force ISO |
| DG_PAD_FORCE_UNHOLD | digital pad force un-hold |
| DG_PAD_FORCE_HOLD | digital pad force hold |
| BT_FORCE_ISO | internal SRAM 2 force ISO |
| BT_FORCE_NOISO | internal SRAM 2 force no ISO |
| DG_PERI_FORCE_ISO | internal SRAM 3 force ISO |
| DG_PERI_FORCE_NOISO | internal SRAM 3 force no ISO |
| CPU_TOP_FORCE_ISO | internal SRAM 4 force ISO |
| CPU_TOP_FORCE_NOISO | internal SRAM 4 force no ISO |
| WIFI_FORCE_ISO | wifi force ISO |
| WIFI_FORCE_NOISO | wifi force no ISO |
| DG_WRAP_FORCE_ISO | digital core force ISO |
| DG_WRAP_FORCE_NOISO | digita core force no ISO |