Filter
Top Products
Intel
®
IXP43X Product Line of Network Processors
April 2007 HDG
Document Number: 316844; Revision: 001US 53
Hardware Design Guidelines—Intel
®
IXP43X Product Line of Network Processors
3.14 Power
The IXP43X network processors have separate power supply domains for the processor
core, DDRII/I SDRAM memory, and input/output peripherals to enable low power
system design.
Table 21. Power Supply
Figure 15. Recommended circuit design on PCB for crystal oscillator
osc
_
in
osc
_
out
R
F
= 1Mohm
R
S
C
C
xtal
Name
Nominal
voltage
†
Description
VCC 1.3V 1.3-V power supply input pins are used for the internal logic.
VCC33 3.3V 3.3-V power supply input pins are used for the peripheral (I/O) logic.
VCCDDR
1.8V or
2.5V
1.8-V or 2.5-V power supply input pins are used for the DDRII/I memory interface.
VSS GND
Ground power supply input pins are used for the 3.3-V, 2.5-V, 1.8-V, and the 1.3-V power
supplies.
USB_v5REF 5.0V
5-V power supply input pins are used for reference voltage.
Note: 3.3-V power supply input can be used but causes damage to the USB controller if signal
pin is shorted to 5V VBUS.
VCCP_OSC 3.3V
3.3-V power supply input pins are used for peripheral (I/O) logic of the analog oscillator circuitry.
Require special power filtering circuitry. See the Intel
®
IXP43X Product Line of Network
Processors Datasheet
VCCF
1.3V 1.3-V power supply input pin. Dedicated for Fuse.
VSSAUBG GND Specialized ground for USB Band Gap.
VCCAUPLL 1.3V
1.3-V power supply input pins are used for USB PLL.
Requires special power filtering circuitry.See the Intel
®
IXP43X Product Line of Network
Processors Datasheet
VCCAUBG 3.3V
3.3-V power supply input pins are used for USB Band Gap
Requires special power filtering circuitry. See the Intel
®
IXP43X Product Line of Network
Processors Datasheet