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Intel
®
854 Graphics Memory Controller Hub (GMCH)
40 D15343-003
Hub Interface
HLRCOMP Analog Hub Interface RCOMP: This signal is connected to a reference resistor
in order to calibrate the buffers.
PSWING Analog RCOMP reference voltage: This is connected to the RCOMP buffer
differential amplifier and is used to calibrate the buffers.
HLVREF Ref
Analog
Input buffer VREF: Input buffer differential amplifier to determine a high
versus low input voltage.
VCCHL Power Power supply for Hub interface buffers
DVO
DVORCOMP Analog
Analog
Compensation for DVO: This signal is used to calibrate the DVO I/O
buffers.
GVREF Ref Analog Input buffer VREF: Input buffer differential amplifier to determine a high
versus low input voltage.
VCCDVO Power Power supply for DVO.
GPIO
VCCGPIO Power Power supply for GPIO buffers
DAC
REFSET Ref
Analog
Resistor Set: Set point resistor for the internal color palette DAC.
VCCADAC Power Power supply for the DAC
VSSADAC Power Ground supply for the DAC
IGD
VCC1_5 Power Digital power supply.
VCC2_5 Power Digital power supply
VCCA Power Analog power supply.
VSSA Power Ground supply
Clocks
VCCAHPLL Power Power supply for the Host PLL.
VCCAGPLL Power Power supply for the Hub/DVO PLL.
VCCADPLLA Power Power supply for the display PLL A.
VCCADPLLB Power Power supply for the display PLL B.
Core
VCC Power Power supply for the core.
VSS Power Ground supply for the chip.