Intel® Core™ Ultra 200H and 200U Series Processors CFG and MEM Registers
| ID | Date | Version | Classification |
|---|---|---|---|
| 844345 | 01/29/2025 | 001 | Public |
P-State Limits (P_STATE_LIMITS_0_2_0_GTTMMADR) – Offset 138148
This register allows SW to limit the maximum frequency allowed during run-time.
PCODE will sample this register in slow loop.
NOTE: Lock bit will only block certain SAI values (POSTBOOT, UCODE, SMM, SUNPASS, BOOT)
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 31 | 0h | RW/L | (LOCK) This bit will lock all settings in this register. |
| 30:16 | 0h | RO | Reserved |
| 15:8 | 0h | RW/L | P-state Minimum (PSTT_MIN) PG1 ratio (used to be an offset from P1, now absolute to avoid avoid interaction with ConfigTDP). This is clipped to be greater than or equal to Pn (or Pm when LPM is enabled), and less than or equal to P1 (after any adjustments by flex ratio, ConfigTDP, etc). |
| 7:0 | ffh | RW/L | P-state Limit (PSTT_LIM) This field indicates the maximum IA frequency limit allowed during run-time. |