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Introduction

12 Document Number: 318080-002

• Processor Information ROM (PIROM) — A memory device located on the

processor and accessible via the System Management Bus (SMBus) which contains

information regarding the processor’s features. This device is shared with the

Scratch EEPROM, is programmed during manufacturing, and is write-protected.

• Scratch EEPROM (Electrically Erasable, Programmable Read-Only Memory)

— A memory device located on the processor and addressable via the SMBus which

can be used by the OEM to store information useful for system management.

• SMBus — System Management Bus. A two-wire interface through which simple

system and power management related devices can communicate with the rest of

the system. It is based on the principals of the operation of the I

C* two-wire serial

bus from Phillips Semiconductor.

Note: I

C is a two-wire communications bus/protocol developed by Phillips.

SMBus is a subset of the I

C bus/protocol and was developed by Intel.

Implementations of the I

C bus/protocol or the SMBus bus/protocol may

require licenses from various entities, including Phillips Electronics N.V. and

North American Phillips Corporation.

• Priority Agent – The priority agent is the host bridge to the processor and is

typically known as the chipset.

• Symmetric Agent – A symmetric agent is a processor which shares the same I/O

subsystem and memory array, and runs the same operating system as another

processor in a system. Systems using symmetric agents are known as Symmetric

Multiprocessing (SMP) systems.

• Integrated Heat Spreader (IHS) – A component of the processor package used

to enhance the thermal performance of the package. Component thermal solutions

interface with the processor at the IHS surface.

• Thermal Design Power – Processor thermal solutions should be designed to meet

this target. It is the highest expected sustainable power while running known

power intensive real applications. TDP is not the maximum power that the

processor can dissipate.

•Intel

64 – Instruction set architecture and programming environment of Intel’s

64-bit processors, which are a superset of and compatible with IA-32. This 64-bit

instruction set architecture was formerly known as IA-32 with EM64T or Intel

EM64T.

• Platform Environment Control Interface (PECI) – A proprietary one-wire bus

interface that provides a communication channel between Intel processor and

chipset components to external thermal monitoring devices, for use in fan speed

control. PECI communicates readings from the processor’s Digital Thermal Sensors

(DTS). The DTS replaces the thermal diode available in previous processors.

• Intel

Virtualization Technology – Processor virtualization which when used in

conjunction with Virtual Machine Monitor software enables multiple, robust

independent software environments inside a single platform.

• VRM (Voltage Regulator Module) – DC-DC converter built onto a module that

interfaces with a card edge socket and supplies the correct voltage and current to

the processor based on the logic state of the processor VID bits.

• EVRD (Enterprise Voltage Regulator Down) – DC-DC converter integrated

onto the system board that provides the correct voltage and current to the

processor based on the logic state of the processor VID bits.

• V

– The processor core power supply.

• V

– The processor ground.

• V

– FSB termination voltage.

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