Datasheet 69
Signal Description
2.13 Miscellaneous Signals
Table 2-13. Miscellaneous Signals
Name Type Description
INTVRMEN I
Internal Voltage Regulator Enable: This signal enables the
internal 1.05 V regulators when pulled high.
This signal must be always pulled-up to VccRTC on desktop platforms
and may optionally be pulled low on mobile platforms if using an
external VR for the DcpSus rail.
DSWVRMEN I
Deep S4/S5 Well Internal Voltage Regulator Enable: This signal
enables the internal DSW 1.05 V regulators.
This signal must be always pulled-up to VccRTC.
SPKR O
Speaker: The SPKR signal is the output of counter 2 and is internally
“ANDed” with Port 61h Bit 1 to provide Speaker Data Enable. This
signal drives an external speaker driver device, which in turn drives
the system speaker. Upon PLTRST#, its output state is 0.
NOTE: SPKR is sampled as a functional strap. See Section 2.27 for
more details. There is a weak integrated pull-down resistor on
SPKR pin.
RTCRST# I
RTC Reset: When asserted, this signal resets register bits in the RTC
well.
NOTES:
1. Unless CMOS is being cleared (only to be done in the G3
power state), the RTCRST# input must always be high when
all other RTC power planes are on.
2. In the case where the RTC battery is dead or missing on the
platform, the RTCRST# pin must rise before the RSMRST#
pin.
SRTCRST# I
Secondary RTC Reset: This signal resets the manageability register
bits in the RTC well when the RTC battery is removed.
NOTES:
1. The SRTCRST# input must always be high when all other RTC
power planes are on.
2. In the case where the RTC battery is dead or missing on the
platform, the SRTCRST# pin must rise before the RSMRST#
pin.
SML1ALERT#/
PCHHOT#/
GPIO74
OD
PCHHOT#: This signal is used to indicate a PCH temperature out of
bounds condition to an external EC, when PCH temperature is greater
than value programmed by BIOS. An external pull-up resistor is
required on this signal.
NOTE: A soft-strap determines the native function SML1ALERT# or
PCHHOT# usage. When soft-strap is 0, function is
SML1ALERT#, when soft-strap is 1, function is PCHHOT#.
INIT3_3V# O
Initialization 3.3 V: INIT3_3V# is asserted by the PCH for 16 PCI
clocks to reset the processor. This signal is intended for Firmware
Hub.
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