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Table 6-13. Processor Core Power Signals (Sheet 2 of 2)
Signal Name
VID[7:6]
VID[5:3]/CSC[2:0]
VID[2:0]/MSID[2:0]
VSS_SENSE
VSS_SENSE_VTT
VTT
VTT_SELECT
VTT_SENSE
58
Description
VID[7:0] (Voltage ID) are used to support automatic
selection of power supply voltages (V
Voltage Regulator-Down (VRD) 11.1 Design Guidelines
for more information. The voltage supply for these
signals must be valid before the VR can supply V
the processor. Conversely, the VR output must be
disabled until the voltage supply for the VID signals
become valid. The VR must supply the voltage that is
requested by the signals, or disable itself.
VID7 and VID6 should be tied separately to V
1 k resistor (This value is latched on the rising edge of
VTTPWRGOOD).
CSC[2:0]—Current Sense Configuration bits, for ISENSE
gain setting. See Voltage Regulator-Down (VRD) 11.1
Design Guidelines for gain setting information. This
value is latched on the rising edge of VTTPWRGOOD.
MSID[2:0] (Market Segment Identification) are used to
indicate the maximum platform capability to the
processor. A processor will only boot if the MSID[2:0]
pins are strapped to the appropriate setting (or higher)
on the platform (see
Table 7-3
MSID is used to help protect the platform by preventing
a higher power processor from booting in a platform
designed for lower power processors. MSID[2:0] are
latched on the rising edge of VTTPWRGOOD.
VCC_SENSE and VSS_SENSE provide an isolated, low
impedance connection to the processor core voltage
and ground. They can be used to sense or measure
voltage near the silicon.
VTT_SENSE and VSS_SENSE_VTT provide an isolated,
low impedance connection to the processor V
and ground. They can be used to sense or measure
voltage near the silicon.
Processor power for the memory controller, shared cache
and I/O (1.1 V).
The VTT_SELECT signal is used to select the correct V
voltage level for the processor. The processor will be
configured to drive a low voltage level for VTT_SELECT.
VTT_SENSE and VSS_SENSE_VTT provide an isolated,
low impedance connection to the processor V
and ground. They can be used to sense or measure
voltage near the silicon.
Direction
). Refer to the
CC
to
CC
using a
SS
for MSID encodings).
voltage
TT
TT
voltage
TT
Signal Description
Type
I/O
CMOS
Analog
Analog
PWR
O
CMOS
Analog
Datasheet, Volume 1
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