Hub Datasheet

Intel
®
E7505 Chipset MCH Datasheet 37
Signal Description
2.7 Clocks, Reset, and Miscellaneous Signals
NOTE: 1) VCC is set at 1.2 V or 1.3V depending on the part. Please refer to the E7505 Specification Update for
more information
Table 2-9. Clocks, Reset, and Miscellaneous Signals
Signal Name Type Description
HCLKINP
HCLKINN
I
DiffCLK
Differential Host Clock In: These pins receive a differential host clock from
the external clock synthesizer. This clock is used by all the Intel
®
E7505
chipset MCH logic in the host clock domain.
GCLKIN
I
CMOS
66 MHz Clock In: This pin receives a 66 MHz clock from the clock
synthesizer. This clock is used by AGP/PCI and HI_A,B clock domains. Note
that this clock input is 3.3 V tolerant.
PWRGD
I
CMOS
Power Good: PWRGD resets all MCH, including “sticky” logic.
RSTIN#
I
CMOS
Reset In: When asserted, this signal will asynchronously reset the MCH
logic. This signal is connected to the PCIRST# output of the Intel
®
ICH4.
This signal is sampled in the S3 power state and used to force DDR outputs
to the reset state and force the CKE pins low.
• This input does not reset the sticky logic.
• This input should have a Schmitt trigger to avoid spurious resets.
• This input needs to be 3.3 V tolerant.
XORMODE#
I
CMOS
Test Input: When asserted, the MCH places all outputs in XOR-mode for
board-level testing.
TESTIN#
I/O
CMOS
Test Input: This pin is used for manufacturing and board level test purposes.
TESTSIG1
I/O
Test signal 1: To keep the XOR Chain contiguous, this signal must have an
accessible test point if XOR Testing is to be implemented. This signal may be
floated.
TESTSIG2
I/O
Test signal 2: To keep the XOR Chain contiguous, this signal must have an
accessible test point, if XOR Testing is to be implemented. This signal may
be floated.
VCCAGP Power: Power pins for the APG interface.
VCCAHI Power: Analog power pin for hub interface.
VTT Power: Power pins for the processor interface.
VCCAFSB Power: Analog power for system bus interface.
VCCDDR Power: Power pins for DDR interface.
VCC
1
Power: These pins are 1.2 V and 1.3 V power pins.
VSS Ground: Ground pin.