Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
D0i3 Control (D0I3C) – Offset 1d4a
This register allows a device driver to enable/disable a device entry into DevIdle.
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 7:4 | 0h | RO | Reserved (Zero) (RSVD7) SW must use zeros for writes. |
| 3 | 1h | RW/1C | Restore Required (RR) When set (by HW), SW must restore state to the IP. The state may have been lost due to a reset or full power lost. SW clears the bit by writing a '1'. This bit will be set on initial power up. |
| 2 | 0h | RW | D0i3 State (I3) SW sets this bit to '1' to move the IP into the D0i3 state. Writing this bit to '0' will return the IP to the fully active D0 state (D0i0). |
| 1 | 0h | RW | Interrupt Request (IR) SW sets this bit to '1' to ask for an interrupt to be generated on completion of the command. SW must clear or set this on each write to this register. |
| 0 | 0h | RO/V | Command In Progress (CIP) HW sets this bit on a 1->0 or 0->1 transition of bit [2]. While set, the other bits in this register are not valid and it is illegal for SW to write to any bit in this register. |