Power and Ground Signals
This section describes the power rails on the PCH.
PCH Power Rail Descriptions for H-Processor
| Name | Description |
|---|
| VCCIN_AUX | FIVR Input rail: 1.8 V |
| VCC_VNNEXT_1P05 | Used for FIVR PRIM_CORE bypass mode during S0ix and Sx: 1.05 V |
| VCC_V1P05EXT_1P05 | Used for FIVR PCH IO bypass mode during S0ix and Sx: 1.05 V |
| VCCA_CLKLDO_1P8 | Analog supply for internal clocks: 1.8 V |
| VCCPRIM1P05_OUT_PCH | 1.05 V Primary Well: for CNVi and other internal I/O blocks. |
| VCCPRIM_1P8 | 1.8 V Primary Well. |
| VCCPRIM_3P3 | 3.3 V Primary Well. |
| VCCPGPPR | Audio Power 3.3 V or 1.8 V. If powered at 3.3 V, the 3.3 V supply can come from VCCPRIM_3P3 supply. If powered at 1.8 V, the 1.8 V supply can come from VCCPRIM_1P8 supply. |
| VCCDSW_3P3 | 3.3 V Deep Sx Well. |
| VCCRTC | RTC Well Supply. This rail can drop to 2.0 V if all other planes are off. This power is not expected to be shut off unless the RTC battery is removed or drained. - VCCRTC nominal voltage is 3.3 V. This rail is intended to always come up first and always stay on. It should NOT be power cycled regularly on non-coin battery designs.
- Implementation should not attempt to clear CMOS by using a jumper to pull VCCRTC low. Clearing CMOS can be done by using a jumper on RTCRST# or GPI.
|
| VCCDPHY_1P24 | 1.24 V for CNVi logic. This rail is generated internally with a LDO and needs to be routed to the motherboard for decoupling purpose only. This rail should not be driven by any motherboard power rails. |
| VCCLDOSTD_0P85 | This rail is generated internally and needs to be routed out to the motherboard for decoupling purpose. |
| VCC1P05_OUT_FET | FIVR output rail: 1.05 V, used for CPU rails VCCST/STG. |
| VCCPGPPBC | Power rail for GPIOs (3.3 V or 1.8 V). |
| VCCPGPPD | Power rail for GPIOs (3.3 V or 1.8 V). |
| VCCPGPPEF | Power rail for GPIOs (3.3 V or 1.8 V). |
| VCCPGPPHK | Power rail for GPIOs (3.3 V or 1.8 V). |
| VCCPGPPI | Power rail for GPIOs (3.3 V or 1.8 V). |
| VCCIN_AUX_VSSSENSE | VCCIN_AUX sense pin. |
| VCCIN_AUX_VCCSENSE | VCCIN_AUX sense pin. |
| VSS | Ground |