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307013-003 Datasheet, PDF (155/848 Pages) Intel Corporation – Intel I/O Controller Hub 7 | |||
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Functional Description
Table 5-26. State Transition Rules for Intel® ICH7
Present
State
Transition Trigger
G0/S0/C0
G0/S0/C1
G0/S0/C2
(Mobile/
Ultra
Mobile
Only)
⢠Processor halt instruction
⢠Level 2 Read
⢠Level 3 Read (Mobile/Ultra Mobile
Only)
⢠Level 4 Read (Mobile/Ultra Mobile
Only)
⢠SLP_EN bit set
⢠Power Button Override
⢠Mechanical Off/Power Failure
⢠Any Enabled Break Event
⢠STPCLK# goes active
⢠Power Button Override
⢠Power Failure
⢠Any Enabled Break Event
⢠Power Button Override
⢠Power Failure
⢠Previously in C3/C4 and bus masters
idle
G0/S0/C3
(Mobile/
Ultra
Mobile
Only)
⢠Any Enabled Break Event
⢠Any Bus Master Event
⢠Power Button Override
⢠Power Failure
⢠Previously in C4 and bus masters idle
G0/S0/C4
(Mobile/
Ultra
Mobile
Only)
G1/S1,
G1/S3, or
G1/S4
G2/S5
⢠Any Enabled Break Event
⢠Any Bus Master Event
⢠Power Button Override
⢠Power Failure
⢠Any Enabled Wake Event
⢠Power Button Override
⢠Power Failure
⢠Any Enabled Wake Event
⢠Power Failure
G3
⢠Power Returns
Next State
⢠G0/S0/C1
⢠G0/S0/C2
⢠G0/S0/C2, G0/S0/C3 or G0/S0/C4 -
depending on C4onC3_EN bit
(D31:F0:Offset A0h:bit 7) and
BM_STS_ZERO_EN bit (D31:F0:Offset
A9h:bit 2) (Mobile/Ultra Mobile Only)
⢠G1/Sx or G2/S5 state
⢠G2/S5
⢠G3
⢠G0/S0/C0
⢠G0/S0/C2
⢠G2/S5
⢠G3
⢠G0/S0/C0
⢠G2/S5
⢠G3
⢠C3 or C4 - depending on PDME bit (D31:F0:
Offset A9h: bit 4)
⢠G0/S0/C0
⢠G0/S0/C2 - if PUME bit (D31:F0: Offset A9h:
bit 3) is set, else G0/S0/C0
⢠G2/S5
⢠G3
⢠C4 - depending on PDME bit (D31:F0: Offset
A9h: bit 4
⢠G0/S0/C0
⢠G0/S0/C2 - if PUME bit (D31:F0: Offset A9h:
bit 3) is set, else G0/S0/C0
⢠G2/S5
⢠G3
⢠G0/S0/C0 (See Note 2)
⢠G2/S5
⢠G3
⢠G0/S0/C0 (See Note 2)
⢠G3
⢠Optional to go to S0/C0 (reboot) or G2/S5
(stay off until power button pressed or other
wake event). (See Note 1 and 2)
NOTES:
1.
Some wake events can be preserved through power failure.
2.
Transitions from the S1âS5 or G3 states to the S0 state are deferred until BATLOW# is
inactive in mobile/Ultra Mobile configurations.
Intel ® ICH7 Family Datasheet
155
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