Signal Description
R
Intel
®
82925X/82925XE MCH Datasheet 29
2.6 Clocks, Reset, and Miscellaneous
Signal Name Type Description
HCLKP
HCLKN
I
CMOS
Differential Host Clock In: These pins receive a differential host clock
from the external clock synthesizer. This clock is used by all of the MCH
logic that is in the Host clock domain.
GCLKP
GCLKN
I
CMOS
Differential PCI Express Graphics Clock In: These pins receive a
differential 100 MHz serial reference clock from the external clock
synthesizer. This clock is used to generate the clocks necessary for the
support of PCI Express.
DREFCLKN
DREFCLKP
I
CMOS
Display PLL Differential Clock In
RSTIN# I
HVIN
Reset In: When asserted, this signal will asynchronously reset the MCH
logic. This signal is connected to the PLTRST# output of the Intel
®
ICH6.
All PCI Express Graphics Attach output signals will also tri-state
compatible with PCI Express* Specification Rev 1.0a.
This input should have a Schmitt trigger to avoid spurious resets.
This signal is required to be 3.3 V tolerant.
PWROK I
HVIN
Power OK: When asserted, PWROK is an indication to the MCH that
core power has been stable for at least 10 us.
EXTTS# I
HVCMOS
External Thermal Sensor Input: This signal may connect to a precision
thermal sensor located on or near the DIMMs. If the system temperature
reaches a dangerously high value, then this signal can be used to trigger
the start of system thermal management. This signal is activated when
an increase in temperature causes a voltage to cross some threshold in
the sensor.
MTYPE I
CMOS
Memory Type Select Strap. This signal is a strapping option that
indicates the type of system memory. This signal should be tied to
ground indicating DDR2 memory.
ICH_SYNC# O
HVCMOS
ICH Sync: This signal is connected to the MCH_SYNCH# signal on the
ICH6.
2.7 Direct Media Interface (DMI)
Signal Name Type Description
DMI_RXP[3:0]
DMI_RXN[3:0]
I/O
DMI
Direct Media Interface: These signals are the receive differential
pair (Rx).
DMI_TXP[3:0]
DMI_TXN[3:0]
O
DMI
Direct Media Interface: These signals are the transmit differential
pair (Tx).
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