301467-005 Datasheet, PDF (43/426 Pages) Intel Corporation – Express Chipset

Signal Description
R
2.7
2.8
Clocks, Reset, and Miscellaneous
Signal Name
HCLKP
HCLKN
GCLKP
GCLKN
DREFCLKN
DREFCLKP
RSTIN#
PWROK
EXTTS#
MTYPE
ICH_SYNC#
Type
I
CMOS
I
CMOS
I
CMOS
I
HVIN
I
HVIN
I
HVCMOS
I
CMOS
O
HVCMOS
Description
Differential Host Clock In: These pins receive a differential host clock
from the external clock synthesizer. This clock is used by all of the
(G)MCH logic that is in the Host clock domain.
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.
Display PLL Differential Clock In
Reset In: When asserted, this signal will asynchronously reset the
(G)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.
Power OK: When asserted, PWROK is an indication to the (G)MCH that
core power has been stable for at least 10 us.
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.
Memory Type Select Strap. This signal is a strapping option that
indicates the type of system memory. For the 82910GL GMCH, this
signal must be tied to ground.
0 = DDR2
1 = DDR
ICH Sync: This signal is connected to the MCH_SYNCH# signal on the
ICH6.
Direct Media Interface (DMI)
Signal Name
DMI_RXP[3:0]
DMI_RXN[3:0]
DMI_TXP[3:0]
DMI_TXN[3:0]
Type
I/O
DMI
O
DMI
Description
Direct Media Interface: These signals are the receive differential
pair (Rx).
Direct Media Interface: These signals are the transmit differential
pair (Tx).
Datasheet
43