Signal Descriptions
74
Datasheet, Volume 1
Note:
1.
DDR{0/1/2} refers to DDR3 Channel 0, DDR3 Channel 1, and DDR3 Channel 2.
§
VID[7:6]
VID[5:3]/CSC[2:0]
VID[2:0]/MSID[2:0]
I/O
VID[7:0] (Voltage ID) are used to support automatic selection
of power supply voltages (V
CC
). Refer to the 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
CC
to 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
SS
using a 1 k
resistor during reset (This value is latched on the rising edge
of VTTPWRGOOD).
MSID[2:0] — MSID[2:0] is used to indicate to the processor
whether the platform supports a particular TDP. A processor
will only boot if the MSID[2:0] pins are strapped to the
appropriate setting on the platform (see
for MSID
encodings). In addition, MSID protects the platform by
preventing a higher power processor from booting in a
platform designed for lower power processors.
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.
VTTA
I
Power for the analog portion of the integrated memory
controller, QPI, and Shared Cache.
VTTD
I
Power for the digital portion of the integrated memory
controller, QPI, and Shared Cache.
VTT_VID[4:2]
O
VTT_VID[2:4] (V
TT
Voltage ID) are used to support automatic
selection of power supply voltages (V
TT
). Refer to the Voltage
Regulator-Down (VRD) 11.1 Design Guidelines for more
information.
VTT_SENSE
VSS_SENSE_VTT
O
O
VTT_SENSE and VSS_SENSE_VTT provide an isolated, low
impedance connection to the processor V
TT
voltage and
ground. They can be used to sense or measure voltage near
the silicon.
VTTPWRGOOD
I
The processor requires this input signal to be a clean
indication that the V
TT
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 de-asserted while VCCPWRGOOD is
asserted.
Table 5-1.
Signal Definitions (Sheet 4 of 4)
Name
Type
Description
Notes
Содержание BX80613I7980
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