Datasheet, Volume 1
15
Electrical Specifications
2.5
Voltage Identification (VID)
The Voltage Identification (VID) specification for the processor is defined by the Voltage
Regulator Down (VRD) 11.1 Design Guidelines. The voltage set by the VID signals is
the reference voltage regulator output voltage to be delivered to the processor VCC
pins. VID signals are CMOS push/pull drivers. Refer to
for the DC
specifications for these signals. The VID codes will change due to temperature and/or
current load changes in order to minimize the power of the part. A voltage range is
provided in
. The specifications have been set such that one voltage regulator
can operate with all supported frequencies.
Individual processor VID values may be set during manufacturing such that two devices
at the same core frequency may have different default VID settings. This is reflected by
the VID range values provided in
The processor
uses eight voltage identification signals, VID[7:0], to support automatic
selection of voltages.
specifies the voltage level corresponding to the state of
VID[7:0]. A ‘1’ in this table refers to a high voltage level and a ‘0’ refers to a low
voltage level. If the processor socket is empty (VID[7:0] = 11111111), or the voltage
regulation circuit cannot supply the voltage that is requested, the voltage regulator
must disable itself. See the Voltage Regulator Down (VRD) 11.1 Design Guidelines for
further details.
The processor
provides the ability to operate while transitioning to an adjacent VID and
its associated processor core voltage (V
CC
). This will represent a DC shift in the
loadline. It should be noted that a low-to-high or high-to-low voltage state change will
result in as many VID transitions as necessary to reach the target core voltage.
Transitions above the maximum specified VID are not permitted.
step sizes and DC shift ranges. Minimum and maximum voltages must be maintained
as shown in
.
The VR used must be capable of regulating its output to the value defined by the new
VID. DC specifications for dynamic VID transitions are included in
and
. Refer to the Voltage Regulator Down (VRD) 11.1 Design Guidelines for
further details.
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