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System Power Delivery Guide—Intel
Table 11.
Development Board Power Delivery Voltage Definitions
VSBY5
VSBY3_3
VSBY2_5
VSBY1_2
VSBY1_0
P5_AUX
P3V3_AUX
P2V5_AUX
P1V0_AUX
VCC3
VCC
V1P0
V2P5
V1P2
V1P8_DDR
DDR2_VTT
V1P8
VCC_CPU
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
®
Intel
EP80579 Integrated Processor Product Line
Order Number: 320068-005US
®
EP80579 Integrated Processor Product Line
Development
Board
Power Rail Signal
Name
5V Standby
3.3V Standby
2.5V Standby
1.2V Standby
1.0V Standby
5V Auxiliary
3.3V Auxiliary
2.5V Auxiliary
1.0V Auxiliary
3.3V
5.0V
1.0V
2.5V
1.2V
1.8V for DDR2
0.9V DDR2 Vref
1.8V for on-board devices
(HSS, FLASH, etc.)
1.0V - 1.3 V for IA-32 core
Definition
Table
12. The V_SEL signal is an open-
May 2010
69
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