The SIO sends a 3.3V signal to the PCH indicating that the standby voltages are stable. 2. Power Button Trigger
The SIO then sends a signal to the PCH, effectively "asking permission" to boot. Sleep State Release (SLP_S4/SLP_S3) desktop motherboard power sequence pdf exclusive
Pressing the power button sends a signal to the SIO. The SIO sends a 3
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