Signal Descriptions

Table 6-14. Processor Asynchronous Sideband Signals (Sheet 3 of 3)

Signal Name

 

Description

 

 

TXT_AGENT

Intel TXT Platform Enable Strap.

 

0

= Default. The socket is not the Intel TXT Agent.

 

1

= The socket is the Intel TXT Agent.

 

In non-Scalable DP platforms, the legacy socket (identified by SOCKET_ID[1:0] = 00b)

 

with Intel TXT Agent should always set the TXT_AGENT to 1b.

 

On Scalable DP platforms the Intel TXT AGENT is at the Node Controller.

 

Refer to the Platform Design Guide for more details.

 

This signal is pulled down on the die, refer to Table 7-6for details.

 

 

 

TXT_PLTEN

Intel TXT Platform Enable Strap.

0 = The platform is not Intel TXT enabled. All sockets should be set to zero. Scalable DP (sDP) platforms should choose this setting if the Node Controller does not support Intel TXT.

1 = Default. The platform is Intel TXT enabled. All sockets should be set to one. In a non- Scalable DP platform this is the default. When this is set, Intel TXT functionality requires user to explicitly enable Intel TXT via BIOS setup.

This signal is pulled up on the die, refer to Table 7-6for details.

Table 6-15. Miscellaneous Signals

Signal Name

Description

 

 

IVT_ID_N

This output can be used by the platform to determine if the installed processor is a

 

future processor planned for the Intel® Xeon® processor E5-1600/E5-2600/E5-4600

 

product families-based Platform. There is no connection to the processor silicon for this

 

signal. This signal is also used by the VCCPLL and VTT rails to switch their output voltage

 

to support future processors.

 

 

SKTOCC_N

SKTOCC_N (Socket occupied) is used to indicate that a processor is present. This is

 

pulled to ground on the processor package; there is no connection to the processor

 

silicon for this signal.

 

 

6.10Processor Power and Ground Supplies

Table 6-16. Power and Ground Signals (Sheet 1 of 2)

Signal Name

Description

 

 

 

Variable power supply for the processor cores, lowest level caches

 

(LLC), ring interface, and home agent. It is provided by a VRM/

 

EVRD 12.0 compliant regulator for each CPU socket. The output

VCC

voltage of this supply is selected by the processor, using the serial

voltage ID (SVID) bus.

 

 

Note: VCC has a Vboot setting of 0.0V and is not included in the

 

PWRGOOD indication. Refer to the VR12/IMVP7 Pulse

 

Width Modulation Specification.

 

 

 

VCC_SENSE and VSS_VCC_SENSE provide an isolated, low

VCC_SENSE

impedance connection to the processor core power and ground.

These signals must be connected to the voltage regulator feedback

VSS_VCC_SENSE

circuit, which insures the output voltage (that is, processor

 

voltage) remains within specification. Please see the applicable

 

platform design guide for implementation details.

 

 

 

VSA_SENSE and VSS_VSA_SENSE provide an isolated, low

VSA_SENSE

impedance connection to the processor system agent (VSA) power

plane. These signals must be connected to the voltage regulator

VSS_VSA_SENSE

feedback circuit, which insures the output voltage (that is,

 

processor voltage) remains within specification. Please see the

 

applicable platform design guide for implementation details.

 

 

150

Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families

 

Datasheet Volume One

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Intel E5-2600 Processor Power and Ground Supplies, Processor Asynchronous Sideband Signals Sheet 3, Miscellaneous Signals