Intel AT80604004872AA User Manual

Intel® Xeon® Processor 7500 Datasheet, Volume 1

Electrical Specifications

The Intel® Xeon® processor 7500 series

provides the ability to operate while

transitioning to an adjacent VID and its associated processor core voltage (Vcc). This
will represent a DC shift in the load line. 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 2-5

includes VID step sizes and DC shift ranges. Minimum and

maximum voltages must be maintained as shown in

Table 2-6

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 2-5

and

Table 2-6

, while AC specifications are included in

Table 2-28

. Refer to the Voltage

Regulator Module (VRM) and Enterprise Voltage Regulator-Down (EVRD) 11.1 Design
Guidelines for further details.

The VIO_VID[4:1] pins identify encoding that determine the voltage to be supplied by
the VR 11.1 to the socket Vio voltage regulators. In all cases, when reading from

Table 2-2

, assume VID7=0, VID6=1, VID5=0, and VID0=0. Note that all Intel® Xeon®

processor 7500 series SKUs will have the same setting.

Power source characteristics must be guaranteed to be stable whenever the supply to
the voltage regulator is stable.

Table 2-2.

Voltage Identification Definition (Sheet 1 of 5)

VID7

VID6

VID5

VID4

VID3

VID2

VID1

VID0

CC_MAX

OFF

1.60000

1.59375

1.58750

1.58125

1.57500

1.56875

1.56250

1.55625

1.55000

1.54375

1.53750

1.53125

1.52500

1.51875

1.51250

1.50625

1.50000

1.49375

1.48750

1.48125

1.47500

1.46875

1.46250