DBUS permission control register 2.
| PRO_DRAM0_RTCFAST_SPLTADDR | Configure the split address of RTC FAST for DBUS0 access. |
| PRO_DRAM0_RTCFAST_L_R | Setting to 1 grants DBUS0 permission to read RTC FAST low address region. |
| PRO_DRAM0_RTCFAST_L_W | Setting to 1 grants DBUS0 permission to write RTC FAST low address region. |
| PRO_DRAM0_RTCFAST_H_R | Setting to 1 grants DBUS0 permission to read RTC FAST high address region. |
| PRO_DRAM0_RTCFAST_H_W | Setting to 1 grants DBUS0 permission to write RTC FAST high address region. |