Intel BX80635E52697V2 User Manual

Intel® Xeon® Processor E5-1600 v2/E5-2600 v2 Product Families

131

Datasheet Volume One of Two

 

• SetVID_fast (10 mV/µs for V

SA

/V

CCD

), 

• SetVID_slow  (2.5 mV/µs for V

SA

/V

CCD

), and 

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

capacitance’s time constant) commands. 

 includes SVID 

step sizes and DC shift ranges. Minimum and maximum voltages must be 
maintained as shown in 

.

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

defined by the new VID. The compatible VR12.0 PWM controller contains further 
details.

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. Typically 10 to 20 mV/µs 
depending on platform, voltage rail, and 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 and entry.

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 1/4 

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.

The SetVID-Decay command is the slowest of the DVID transitions. It is only used for 

VID down transitions. The VR does not control the slew rate, the output voltage 

declines with the output load current only. 

The SetVID- Decay command is preemptive, that is, the VR interrupts its current 

processes and moves to the new VID. 

The processor has three power state functions and these will be set seamlessly via the 
SVID bus using the SetPS command. Based on the power state command, the SetPS 

commands sends information to VR controller to configure the VR to improve efficiency, 
especially at light loads. For example, typical power states are:

• PS(00h): Represents full power or active mode
• PS(01h): Represents a light load 5A to 20A
• PS(02h): Represents a very light load <5A