Upon validating the power button request, the Chipset begins dropping its sleep state isolation lines: SLP_S5# goes High (exiting shutdown state). SLP_S4# goes High (exiting hibernation state). SLP_S3# goes High (exiting sleep state). Phase 3: Main Rail Deployment and Power Supply Activation
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Before you even touch the power button, certain "Always-On" voltages must be present. +5V Standby (+5VSB):
This phase represents the transition from the S5 (Soft Off) state to the S0 (Working) state. It begins when a user presses the physical power button. Upon validating the power button request, the Chipset
The PCH raises the SLP_S4# (Sleep S4) and SLP_S3# (Sleep S3) signals to high (3.3V). These signals act as the green light to enable system-wide power conversion (turning on the RAM, PCH, and CPU power rails). 4. System Power Rails (Buck Converters) +3VSpositive 3 cap V sub cap S +5VSpositive 5 cap V sub cap S +12VSpositive 12 cap V sub cap S
Once SLP_S4# and SLP_S3# are high, the motherboard enables secondary power rails the CPU core. Phase 3: Main Rail Deployment and Power Supply
The following is a list of key acronyms and terms used in this guide:
The SIO pulls Pin 16 of the 24-pin ATX connector ( PS_ON# ) to .
When both lines go High, the SIO realizes the system is authorized to enter the S0 state.