Datasheet

Electrical Specifications
Intel
®
Xeon
®
Processor C5500/C3500 Series
Datasheet, Volume 1 January 2010
488 Order Number: 323103-001
Individual processor VID values may be calibrated during manufacturing such that two
processor units with the same core frequency may have different default VID settings.
The processor uses eight voltage identification signals, VID[7:0], to support automatic
selection of core power supply voltages. Table 156 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 (SKTOCC#
high), or the voltage regulation circuit cannot supply the voltage that is requested, the
voltage regulator must disable itself. See the Voltage Regulator Module (VRM) and
Enterprise Voltage Regulator-Down (EVRD) 11.1 Design Guidelines, Revision 1.5 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 is represented by a DC shift in the
loadline. It should be noted that a low-to-high or high-to-low voltage state change may
result in as many VID transitions as necessary to reach the target core voltage.
Transitions above the maximum specified VID are not permitted. Table 162 includes
VID step sizes and DC shift ranges. Minimum and maximum voltages must be
maintained as shown in Table 163.
The VRM or EVRD utilized must be capable of regulating its output to the value defined
by the new VID. DC specifications for dynamic VID transitions are included in
Table 172. See the Voltage Regulator Module (VRM) and Enterprise Voltage Regulator-
Down (EVRD) 11.1 Design Guidelines, Revision 1.5 for further details.
Power source characteristics must be guaranteed to be stable whenever the supply to
the voltage regulator is stable.
Table 156. Voltage Identification Definition (Sheet 1 of 5)
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0 V
CC_MAX
00000000 OFF
00000001 OFF
0 0 0 0 0 0 1 0 1.60000
0 0 0 0 0 0 1 1 1.59375
0 0 0 0 0 1 0 0 1.58750
0 0 0 0 0 1 0 1 1.58125
0 0 0 0 0 1 1 0 1.57500
0 0 0 0 0 1 1 1 1.56875
0 0 0 0 1 0 0 0 1.56250
0 0 0 0 1 0 0 1 1.55625
0 0 0 0 1 0 1 0 1.55000
0 0 0 0 1 0 1 1 1.54375
0 0 0 0 1 1 0 0 1.53750
0 0 0 0 1 1 0 1 1.53125
0 0 0 0 1 1 1 0 1.52500
0 0 0 0 1 1 1 1 1.51875
0 0 0 1 0 0 0 0 1.51250
0 0 0 1 0 0 0 1 1.50625
0 0 0 1 0 0 1 0 1.50000
0 0 0 1 0 0 1 1 1.49375
0 0 0 1 0 1 0 0 1.48750