Acer E3-1220 v3 KC.12201.3E3 Manuale Utente

This chapter provides the processor electrical specifications including integrated

voltage regulator (VR), V

CC

 Voltage Identification (VID), reserved and unused signals,

signal groups, Test Access Points (TAP), and DC specifications.

A new feature to the processor is the integration of platform voltage regulators into

the processor. Due to this integration, the processor has one main voltage rail (V

CC

)

and a voltage rail for the memory interface (V

DDQ

) , compared to six voltage rails on

previous processors. The V

CC

 voltage rail will supply the integrated voltage regulators

which in turn will regulate to the appropriate voltages for the cores, cache, system

agent, and graphics. This integration allows the processor to better control on-die

voltages to optimize between performance and power savings. The processor V

CC

 rail

will remain a VID-based voltage with a loadline similar to the core voltage rail (also

called V

CC

) in previous processors.

The processor has VCC, VDDQ, and VSS (ground) lands for on-chip power distribution.

All power lands must be connected to their respective processor power planes, while

all VSS lands must be connected to the system ground plane. Use of multiple power

and ground planes is recommended to reduce I*R drop. The VCC lands must be

supplied with the voltage determined by the processor Serial Voltage IDentification

(SVID) interface. 

 on page 87 specifies the voltage level for the various

VIDs.

The processor uses three signals for the serial voltage identification interface to

support automatic selection of voltages. The following table specifies the voltage level

corresponding to the 8-bit VID value transmitted over serial VID. A ‘1’ in this table

refers to a high voltage level and a ‘0’ refers to a low voltage level. If the voltage

regulation circuit cannot supply the voltage that is requested, the voltage regulator

 on page

98 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 

 on page 94. The

specifications are set so that one voltage regulator can operate with all supported

frequencies.

Individual processor VID values may be set during manufacturing so that two devices

at the same core frequency may have different default VID settings. This is shown in

 on page 94. The

processor provides the ability to operate while transitioning to an adjacent VID and its

associated voltage. This will represent a DC shift in the loadline.

Intel

®

 Xeon

®

 Processor E3-1200 v3 Product Family

Datasheet – Volume 1 of 2

June 2013

86

Order No.: 328907-001