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Signal Description
D15343-003 39
3.6 Voltage References, PLL Power
Table 14. Voltage References, PLL Power
Signal Name Type Description
Host Processor
HXRCOMP Analog Host RCOMP: Used to calibrate the Host AGTL+ I/O buffers.
HYRCOMP Analog Host RCOMP: Used to calibrate the Host AGTL+ I/O buffers.
HXSWING Analog Host Voltage Swing (RCOMP reference voltage): This signal provides
a reference voltage used by the FSB RCOMP circuit.
HYSWING Analog Host Voltage Swing (RCOMP reference voltage): This signal provides
a reference voltage used by the FSB RCOMP circuit.
HDVREF[2:0] Ref
Analog
Host Data (input buffer) VREF: Reference voltage input for the data
signals of the Host AGTL+ Interface. Input buffer differential amplifier to
determine a high versus low input voltage.
HAVREF Ref
Analog
Host Address (input buffer) VREF: Reference voltage input for the
address signals of the Host AGTL+ Interface. This signal is connected to
the input buffer differential amplifier to determine a high versus low input
voltage.
HCCVREF Ref Analog Host Common Clock (Command input buffer) VREF: Reference
voltage input for the common clock signals of the Host AGTL+ Interface.
This signal is connected to the input buffer differential amplifier to
determine a high versus low input voltage.
VTTLF Power FSB Power Supply: VTTLF is the low frequency connection from the
board. This signal is the primary connection of power for GMCH.
VTTHF Power FSB Power Supply: VTTHF is the high frequency supply. It is for direct
connection from an internal package plane to a capacitor placed
immediately adjacent to the GMCH.
NOTE: Not to be connected to power rail.
System Memory
SMRCOMP Analog System Memory RCOMP: This signal is used to calibrate the memory I/
O buffers.
SMVREF_0 Ref
Analog
Memory Reference Voltage(Input buffer VREF):Reference voltage
input for Memory Interface.
Input buffer differential amplifier to determine a high versus low input
voltage.
SMVSWINGH Ref
Analog
RCOMP reference voltage: This is connected to the RCOMP buffer
differential amplifier and is used to calibrate the I/O buffers.
SMVSWINGL Ref
Analog
RCOMP reference voltage: This is connected to the RCOMP buffer
differential amplifier and is used to calibrate the I/O buffers.
VCCSM Power Power supply for Memory I/O.
VCCQSM Power Power supply for system memory clock buffers.
VCCASM Power Power supply for system memory logic running at the core voltage
(isolated supply, not connected to the core).