Intel EP80579 Guide

Intel
®
EP80579 Integrated Processor Product Line May 2010
Order Number: 320068-005US 69
System Power Delivery Guide—Intel
®
EP80579 Integrated Processor Product Line
6.5 Power Delivery Guidelines
The following guidelines are recommended for optimal EP80579 power delivery. The
main focus of these guidelines is to minimize power noise and signal integrity quality.
The guidelines are not intended to replace thorough system validation of products.
6.5.1 IA-32 core Power (VCC_CPU)
This supply provides the voltage for the IA-32 core. The voltage plane ranges from
1.0V - 1.3V based on the core frequency. The Development Board uses a Pulse Width
Modulator (PWM) controller-based switching voltage regulator design to provide the IA-
32 core power. The IA-32 core has its own independent voltage regulator and the
design is Voltage Regulator-Down on the motherboard (VRD). The VRD is powered by
+5V from the ATX power supply.
6.5.1.1 IA-32 core Bus Frequency and Power Select
The IA-32 core voltage is controlled by two signals (BSEL & V_SEL) from the EP80579.
The BSEL and V_SEL signals are driven by EP80579 to reflect the internal strapping of
the various EP80579 SKUs. The BSEL/V_SEL encodings should be interpreted to
generate the required CPU voltage as shown in Table 12. The V_SEL signal is an open-
Table 11. Development Board Power Delivery Voltage Definitions
Development
Board
Power Rail Signal
Name
Definition
VSBY5 5V Standby
VSBY3_3 3.3V Standby
VSBY2_5 2.5V Standby
VSBY1_2 1.2V Standby
VSBY1_0 1.0V Standby
P5_AUX 5V Auxiliary
P3V3_AUX 3.3V Auxiliary
P2V5_AUX 2.5V Auxiliary
P1V0_AUX 1.0V Auxiliary
VCC3 3.3V
VCC 5.0V
V1P0 1.0V
V2P5 2.5V
V1P2 1.2V
V1P8_DDR 1.8V for DDR2
DDR2_VTT 0.9V DDR2 Vref
V1P8
1.8V for on-board devices
(HSS, FLASH, etc.)
VCC_CPU 1.0V - 1.3 V for IA-32 core

Intel EP80579 Specifications

General

Brand	Intel
Model	EP80579
Category	Computer Hardware
Language	English