82NM10 Datasheet, PDF (62/671 Pages) Intel Corporation – Intel® NM10 Family Express Chipset

Signal Description
Table 2-24.Functional Strap Definitions (Sheet 2 of 2)
Signal
Usage
When
Sampled
Comment
This signal has a weak internal pull-up.The
internal pull-up is disabled within 100 ms after
RSMRST# deasserts.
If the signal is sampled high, the DMI interface is
strapped to operate in DC coupled mode (No coupling
capacitors are required on DMI differential pairs).
If the signal is sampled low, the DMI interface is
strapped to operate in AC coupled mode (Coupling
capacitors are required on DMI differential pairs).
GPIO25
DMI AC/DC
Coupling
Selection
Rising Edge of
RSMRST#
NOTES:
1.
Board designer must ensure that DMI
implementation matches the strap
selection.
2.
The signal must be held low at least 2 us
after RSMRST# deassertion to enable AC
coupled mode.
3.
When the chipset pairs with Intel®
Atom™ Processor D400, D500 and N400
series, should enable AC couple mode for
Receive signal and DC couple mode for
Transmit signal.
INTVRMEN
Enable
Integrated
VccSus1_05
VRM
Always
Enables integrated VccSus1_05 VRM when
sampled high.
LINKALERT# Reserved
This signal requires an external pull-up resistor.
SATALED#
Reserved
This signal has a weak internal pull-up enabled
only when PLTRST# is asserted.
NOTE: This signal should not be pulled low.
SPKR
No Reboot
Rising Edge of
PWROK
The signal has a weak internal pull-down. If the
signal is sampled high, this indicates that the
system is strapped to the “No Reboot” mode (the
chipset will disable the TCO Timer system reboot
feature). The status of this strap is readable via
the NO REBOOT bit (Chipset Config
Registers:Offset 3410h:bit 5).
NOTE: See Section 3.1for full details on pull-up/pull-down resistors.
2.22.2
External RTC Circuitry
To reduce RTC well power consumption, the chipset implements an internal oscillator
circuit that is sensitive to step voltage changes in VccRTC. Following figure shows an
example schematic recommended to ensure correct operation of chipset RTC.
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Datasheet