If VCC18 I/O power is applied when VDD10 core power is not applied, then all mDDR (non-fail-safe) and non-mDDR (fail-safe) output signals associated with the VCC18 supply are in a high-impedance state.
If VCC_INTF or VCC_FLSH I/O power is applied when VDD10 core power is not applied, then all output signals associated with these inactive I/O supplies are in a high-impedance state.
If VDD10 core power is applied but VCC_INTF or VCC_FLSH I/O power is not applied, then all output signals associated with these inactive I/O supplies are in a high-impedance state.
If VDD10 core power is applied but VCC18 I/O power is not applied, then all mDDR (non-fail-safe) and non-mDDR (fail-safe) output signals associated with the VCC18 I/O supply are in a high-impedance state. However, if driven high externally, only the non-mDDR (fail-safe) output signals remain in a high-impedance state, and the mDDR (non fail-safe) signals are shorted to ground through clamping diodes.