The PCH directly supports different sleep states (S1–S5), which are entered by methods such as setting the SLP_EN bit or due to a Power Button press. The entry to the Sleep states is based on several assumptions:
• The G3 state cannot be entered using any software mechanism. The G3 state indicates a complete loss of power.
S1:System lowers the processor’s power consumption. No snooping is possible in this state.
S3:The PCH asserts SLP_S3#. The SLP_S3# signal controls the power to non-critical circuits.Power is only retained to devices needed to wake from this sleeping state, as well as to the memory.
S4:
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