Signal Definitions
Table 5-1.
Signal Definitions (Sheet 6 of 6)
Name
Type
Description
VID[7:0]
I/O
VID[7:0] is an input only during Power On Configuration. It is an output signal
during normal operation.
As an output, VID[7:0] (Voltage ID) are signals that are used to support automatic
selection of power supply voltages (V ). Refer to the Voltage Regulator Module
CC
(VRM) and Enterprise Voltage Regulator-Down (EVRD) 11.1 Design Guidelines for
more information. The voltage supply for these signals must be valid before the VR
can supply V to the processor. Conversely, the VR output must be disabled until
CC
the voltage supply for the VID signals become valid. The VID signals are needed to
support the processor voltage specification variations. The VR must supply the
voltage that is requested by the signals, or disable itself.
As an inputs during Power On Configuration:
VID [7] is an electronic safety key for distinguishing VR11.1 from PMPV6.
VID[6] is a spare bit reserved for future use.
VID[5:3] - IMON bits are output signals for IMON gain setting. See Voltage
Regulator Module (VRM) and Enterprise Voltage Regulator-Down (EVRD) 11.1
Design Guidelines for gain setting information.
VID[2:0] or MSID[2:0] - Market Segment ID, or MSID are provided to indicate the
Market Segment for the processor and may be used for future processor
compatibility or for keying. In addition, MSID protects the platform by preventing a
higher power processor from booting in a platform designed for lower power
processors. This value is latched from the platform in to the CPU, on the rising edge
of VioPWRGOOD, during the cold boot power up sequence.
VIO_VID[4:1]
O
Voltage ID driven out to the VR 11.1 for dynamic/static adjustment of processor
voltage set point. Note that these pins are either floated, or tied to ground on the
package.
VIOC
VIOF
I
I
VIOC provides power to the input/output interface on the Intel Xeon Processor E7-
8800/4800/2800 Product Families processor Intel® QPI I/O.
VIOF provides power to the input/output interface on the Intel Xeon Processor E7-
8800/4800/2800 Product Families processor Intel® SMI I/O.
VIOPowerGood
VREG
I
I
I
VIO Power Good signal.
~1.8 V. Voltage to PLLs.
VSS
VSS is the ground plane for the Intel Xeon Processor E7-8800/4800/2800 Product
Families processor.
VSSCACHESENSE
IO
VR Sense lines. (Vcache)
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Datasheet Volume 1 of 2
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