Intel E5-1428L CM8062001144000 Data Sheet

The processor uses voltage identification signals to support automatic selection of

V

CCIN 

power supply voltage. If the processor socket is empty (SKTOCC_N high), or a

"not supported" response is received from the SVID bus, then the voltage regulation

circuit cannot supply the voltage that is requested, the voltage regulator must disable

itself or not power on. Vout MAX register (30h) is programmed by the processor to set

the maximum supported VID code and if the programmed VID code is higher than the

VID supported by the VR, then VR will respond with a "not supported"

acknowledgment.

The processor provides the ability to operate while transitioning to a new VID setting

and its associated processor voltage rail (V

CCIN

). This is represented by a DC shift. 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 voltage. Transitions above

the maximum specified VID are not supported. The processor supports the following

VR commands:
•

SetVID_Fast (20 mV/µs)

•

SetVID_Slow (5 mV/µs)

•

Slew Rate Decay (downward voltage only and it's a function of the output

on page 21 includes SVID step

sizes and DC shift ranges. Minimum and maximum voltages must be maintained

as shown in 

on page 31.

The VRM or EVRD utilized must be capable of regulating its output to the value defined

by the new VID.

Power source characteristics must be guaranteed to be stable whenever the supply to

the voltage regulator is stable.

The SetVID_Fast command contains the target VID in the payload byte. The range of

voltage is defined in the VID table. The VR should ramp to the new VID setting with a

fast slew rate as defined in the slew rate data register. It is minimum of 20 mV/µs,

depending on the amount of decoupling capacitance.

The SetVID_Fast command is preemptive. The VR interrupts its current processes and

moves to the new VID. The SetVID_Fast command operates on 1 VR address at a

time. This command is used in the processor for package C6 fast exit.

The SetVID_Slow command contains the target VID in the payload byte. The range of

voltage is defined in the VID table. The VR should ramp to the new VID setting with a

"slow" slew rate as defined in the slow slew rate data register. The SetVID_Slow is

nominally 4x slower than the SetVID_Fast slew rate.

The SetVID_Slow command is preemptive, the VR interrupts its current processes and

moves to the new VID. This is the instruction used for normal P-state voltage change.

This command is used in the processor for the Intel Enhanced SpeedStep Technology

transitions.

Intel

®

 Xeon

®

 Processor E5-1600 and E5-2600 v3 Product Families, Volume 1 of 2, Electrical

Datasheet

September 2014

18

Order No.: 330783-001