Embedded Voltage Regulator-Down (EmVRD) 11.0 Design Guidelines for Embedded Implementations Supporting PGA478

EmVRD 11.0—1.0
Embedded Voltage Regulator-Down (EmVRD) 11.0
Design Guidelines for Embedded Implementations January 2007
8
This document describes the following areas of implementation in support of the
processor:
• Processor Load-Line
•Tolerance Band (TOB)
• Voltage and Current Requirements
• Bypass Capacitor Details
• Layout Considerations
• EmVRD Controller Details
This document does not describe the implementation of a enterprise/server VRM/EVRD
10.x or desktop VRD10.x compatible voltage regulator, because they are not
compatible with this family of processors.
1.2 Terminology
Table 1. Glossary (Sheet 1 of 2)
Term Description
σ
Sigma – standard deviation
AVP Adaptive Voltage Positioning
D-VID
Dynamic Voltage Identification. A low power mode of operation where the processor instructs
the EmVRD to operate at a lower voltage.
DAC Digital to Analog Converter
DCR Direct Current Resistance
ESL Effective Series Inductance
ESR Effective Series Resistance
FET Field Effect Transistor
FORCEPR#
Under thermal monitoring, the EmVRD asserts this processor input to indicate an over-
temperature condition has occurred. Assertion of this signal sets the processor in a low-power
state, thereby cooling the voltage regulator.
FR4 A type of printed circuit board (PCB) material.
HVM High Volume Manufacturing
V
CC
EmVRD output voltage or the processor’s main input voltage.
I
CC
EmVRD output current or the processor’s main input current.
VTT Voltage Test Tool
Vtt Processor Termination Voltage
Itt Bus current associated with the V
CCP
(Vtt) supply.
PGA478 Socket
The surface-mount Zero Insertion Force (ZIF) socket designed to accept several Intel
processors, including the Dual-Core Intel Xeon processor LV family
RLL
A linear equation that describes a voltage to current relationship resulting in system
impedance. The load-line equations is Vcc = VID – Icc*RLL +/- Offset, also known as Load Line
Impedance
MLCC Multi-Layer Ceramic Cap
MOSFET Metal Oxide Semiconductor Field Effect Transistor
OCP Output Current Protection
OVP Output Voltage Protection