EWIXP420ABBT Intel, EWIXP420ABBT Datasheet - Page 49

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EWIXP420ABBT

Manufacturer Part Number
EWIXP420ABBT
Description
Manufacturer
Intel
Datasheet

Specifications of EWIXP420ABBT

Core Operating Frequency
533MHz
Package Type
BGA
Pin Count
492
Mounting
Surface Mount
Operating Temperature (max)
85C
Operating Temperature (min)
-40C
Operating Temperature Classification
Industrial
Lead Free Status / Rohs Status
Compliant

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12
General Hardware Design Considerations—Intel
plane processors
3.12.1
Table 13.
3.12.2
3.12.3
December 2007
Document Number: 252817-008US
The interfaces require oscillators on the board.
Although some interfaces require similar frequency oscillators (for example, the
expansion bus, and PCI), separate oscillators are used for each to allow oscillator
frequencies to be altered on each interface independently.
The PCI clock is driven out of the PCI-to-PCI bridge when one of the processors is in
option mode and is driven by either the processors (GPIO14) or an external oscillator
when one of the processors is host.
Clock Signals
Clock Signals
Using Oscillator
When an external oscillator is used to supply the 33.33-MHz clock, connect the
oscillator output to the OSC_IN pin. Leave the OSC_OUT pin floating.
the connections of an oscillator to the IXP42X product line and IXC1100 control plane
processors.
Design Notes
When an external oscillator is used to supply the 33.33-MHz clock, it takes about 9.0 µs
for the internal IXP42X product line and IXC1100 control plane processors’ PLL to lock.
Note:
• Processors’ system clock – 33.33 MHz
• PCI host clock – 33 MHz and 66 MHz selectable
• Expansion bus clock – This expansion bus clock may be driven through GPIO15 or
OSC_OUT
using an external oscillator.
OSC_IN
Name
For explanations of the
Type*
Intel
O
I
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
33.33-MHz sinusoidal input signal. Can be driven by an oscillator.
33.33-MHz sinusoidal output signal. Left disconnected when being driven by
an oscillator.
Type
®
IXP42X product line and IXC1100 control
column abbreviations, see
Description
Table 21 on page
Hardware Design Guidelines
81.
Figure 16
shows
49