Intel® Core™ Ultra Series 3 Processors I/O Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 872352 | 04/14/2026 | 001 | Public |
Extended Test Mode Register 3 (ETR3) – Offset 1048
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31 | 0h | RW/V/L | CF9h Lockdown (CF9LOCK) When set, this will lock the CF9h Global Reset bit. |
| 30 | 0h | RW/V | Latch Events C10 exit (LATCH_EVENTS_C10_EXIT) When this bit is set to '1', LPM entry events in |
| 29 | 0h | RW | Latch LPM events (LATCH_LPM_EVENTS) When this bit is written to 1, the current state of low power mode requirements is latched and captured in LPM_STS_X registers. |
| 28 | 0h | WO | Clear LPM events (CLR_LPM_EVENTS) A write of 1 clears all LPM_STS_* registers. |
| 27:25 | 0h | RW/V | Reserved (RSVD27_25) These bits are physically implemented but not used. |
| 24 | 0h | RW/L | Reserved (PB_DIS_LOCK) Once set, this bit cannot be changed until the next global reset. When this bit is set to 1, the PM_CFG*.PB_DIS bit can no longer be changed. |
| 23:21 | 0h | RO | Reserved |
| 20 | 0h | RW/L | CF9h Global Reset (CF9GR) When this bit is set, a CF9h write of 6h or Eh will cause a Global Reset of both the Host and the ME partitions. If this bit is cleared, a CF9h write of 6h or Eh will only reset the Host partition. |
| 19:0 | 0h | RO | Reserved |