Intel Core i7 Extreme Edition Datasheet page 76

Table 5-1. Signal Definitions (Sheet 4 of 4)
Name
VTT_VID[4:2]
VTT_SENSE
VSS_SENSE_VTT
VTTPWRGOOD
1. DDR{0/1/2} refers to DDR3 Channel 0, DDR3 Channel 1, and DDR3 Channel 2.
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Type
O VTT_VID[2:4] (VTTVoltage ID) are used to support automatic selection of power
supply voltages (V ).
TT
O VTT_SENSE and VSS_SENSE_VTT provide an isolated, low impedance
connection to the processor V
O
measure voltage near the silicon.
I The processor requires this input signal to be a clean indication that the V
power supply is stable and within specifications. 'Clean' implies that the signal
will remain low (capable of sinking leakage current), without glitches, from the
time that the power supplies are turned on until they come within specification.
The signal must then transition monotonically to a high state. Note that it is not
valid for VTTPWRGOOD to be deasserted while VCCPWRGOOD is asserted.
Description
voltage and ground. They can used to sense or
TT
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Signal Definitions
Notes
TT
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