Intel D15343-003 manual Voltage References, PLL Power

Signal Description

3.6Voltage 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	Host Data (input buffer) VREF: Reference voltage input for the data
		Analog	signals of the Host AGTL+ Interface. Input buffer differential amplifier to
			determine a high versus low input voltage.
	HAVREF	Ref	Host Address (input buffer) VREF: Reference voltage input for the
		Analog	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	Memory Reference Voltage(Input buffer VREF):Reference voltage
		Analog	input for Memory Interface.
			Input buffer differential amplifier to determine a high versus low input
			voltage.
	SMVSWINGH	Ref	RCOMP reference voltage: This is connected to the RCOMP buffer
		Analog	differential amplifier and is used to calibrate the I/O buffers.
	SMVSWINGL	Ref	RCOMP reference voltage: This is connected to the RCOMP buffer
		Analog	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).

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