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Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors
February 2007 HDD
Document Number: 305261; Revision: 004 55
General Hardware Design Considerations—Intel
®
IXP45X and Intel
®
IXP46X Product Line of
Network Processors
3.14.3 Device Connection
3.15 Power
To enable low power system design, the IXP45X/IXP46X network processors have
separate power supply domains for the processor core, DDR SDRAM memory, and
input/output peripherals.
Figure 18. Clock Oscillator Interface Example
3.3 V
OSC_IN
OSC_OUT
OUT
ON
VDD
0.01 µF
33.33 MHz
B4111-001
Intel
®
IXP46X
Product Line of
Network Processors
33 Ω
10 KΩ
Table 24. Power Interface (Sheet 1 of 2)
Name
Nominal
Voltage
Description
VCC 1.3 V
Core supply voltage.
Note: If operating at 667MHz, core supply voltage must be increased to VCC = 1.5 V. For details, see
the Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors Datasheet.
VCCP 3.3 V I/O supply voltage.
VCCM 2.5 V DDR memory interface supply voltage.
VSS GND Ground for supply voltages 3.3 V, 2.5 V, and 1.3/1.5 V.
OSC_VCCP 3.3 V
Supply voltage for peripheral (I/O) logic of analog oscillator circuitry.
Require special power filtering circuitry. See the Intel
®
IXP45X and Intel
®
IXP46X Product Line of
Network Processors Datasheet.
OSC_VSSP GND
Ground for peripheral (I/O) logic of analog oscillator circuitry. Used in conjunction with the OSC_VCCP
pins.
Require special power filtering circuitry. See the Intel
®
IXP45X and Intel
®
IXP46X Product Line of
Network Processors Datasheet.
OSC_VCC 1.3 V
Supply voltage for internal logic of the analog oscillator circuitry. Requires special power filtering
circuitry. If operating at 667 MHz, this voltage must be increased to 1.5 V.
See the Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors Datasheet.
OSC_VSS GND
Ground for internal logic of the analog oscillator circuitry. Used in conjunction with the OSC_VCC pins.
Require special power filtering circuitry. See the Intel
®
IXP45X and Intel
®
IXP46X Product Line of
Network Processors Datasheet.