Datasheet 107
PCH Pin States
20. Pin-state indicates SUSPWRDNACK in Non-Deep S4/S5, Deep S4/S5 after RTC power
failure.
21. Pin-state indicates SUSWARN# in Deep S4/S5 supported platforms.
22. When Controller Reset Bit of Global Control Register (D27:F0 Offset HDBAR 08h Bit 0) gets
set, this pin will start toggling.
23. Not all signals or pin functionalities may be available on a given SKU. See Section 1.3 and
Chapter 2 for details.
3.3 Power Planes for Input Signals
Table 3-4 and Table 3-5 shows the power plane associated with each input signal, as
well as what device drives the signal at various times. Valid states include:
High
Low
Static: Will be high or low, but will not change
Driven: Will be high or low, and is allowed to change
Running: For input clocks
PCH suspend well signal states are indeterminate and undefined and may glitch prior to
RSMRST# deassertion. This does not apply to SLP_S3#, SLP_S4#, and SLP_S5#.
These signals are determinate and defined prior to RSMRST# deassertion.
PCH core well signal states are indeterminate and undefined and may glitch prior to
PWROK assertion. This does not apply to THRMTRIP#. This signal is determinate and
defined prior to PWROK assertion.
DSW indicates PCH Deep S4/S5 Well. This state provides a few wake events and critical
context to allow system to draw minimal power in S4 or S5 states.
ASW indicates PCH Active Sleep Well. This power well contains functionality associated
with active usage models while the host system is in Sx.
Table 3-4. Power Plane for Input Signals for Desktop Configurations (Sheet 1 of 3)
Signal Name Power Well Driver During Reset S0/S1 S3 S4/S5
DMI
DMI[3:0]RXP,
DMI[3:0]RXN
Core Processor Driven Off Off
PCI Express*
PER[8:1]p, PERn[8:1]n Core PCI Express Device Driven Off Off
PCI Bus
REQ0#,
REQ1# / GPIO50
1
REQ2# / GPIO52
1
REQ3# / GPIO54
1
Core External Pull-up Driven Off Off
PME# Suspend Internal Pull-up Driven Driven Driven
SERR# Core PCI Bus Peripherals Driven Off Off
LPC Interface
LDRQ0# Core LPC Devices Driven Off Off
LDRQ1# / GPIO23
1
Core LPC Devices Driven Off Off
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