In all the tables contained in this manual, Power rails are named with the following meaning:
VCC: Power Supply +5VDC ±5%
VCC_5V_SB: Standby Power Supply +5VDC ±5%
VCC_RTC: 3V backup cell input. VCC_RTC is connected to a 3V backup cell for RTC operation and storage register non-volatility in the absence of system power
_RUN: Switched voltages, i.e. power rails that are active only when the board is in ACPI's S0 (Working) state. Examples: +3.3V_RUN, +5V_RUN.
_ALW: Always-on voltages, i.e. power rails that are active both in ACPI's S0 (Working), S3 (Standby) and S5 (Soft Off) state. Examples: +5V_ALW, +3.3V_ALW.