Intel® 400 Series Chipset On-Package Platform Controller Hub
Online Register Database
| ID | Date | Version | Classification |
|---|---|---|---|
| 615146 | 08/09/2019 | 1.2 | Public |
Power Management Configuration Reg 4 (PM_CFG4) – Offset 18e8
| Bit Range | Default | Access | Field Name and Description |
|---|---|---|---|
| 30 | 0b | RW | USB2 PHY SUS Well Power Gating Enable (U2_PHY_PG_EN) If this bit is 1, dynamic power gating of the USB2 PHY SUS well is enabled. Note: This bit prevents HW from initiating power gating entry. |
| 29:16 | - | - | Reserved
|
| 15:12 | 8h | RW | VccST Ramp Timer (VCCST_TMR) This field determines the time from when SLP_S0# de-asserts until the CPU's VccST gated rail has ramped back up after being gated in C10. This timer starts when SLP_S0# asserts and has the effect of delaying any transactions on PM_SYNC until it expires. |
| 11:9 | - | - | Reserved
|
| 8:0 | 000h | RW | CPU I/O VR Ramp Duration (CPU_IOVR_RAMP_DUR) This value is used in the CPU I/O VR ramp timer and has a 10us granularity. |