EWIXP420ABBT Intel, EWIXP420ABBT Datasheet - Page 49
Manufacturer Part Number
Specifications of EWIXP420ABBT
Core Operating Frequency
Operating Temperature (max)
Operating Temperature (min)
Operating Temperature Classification
Lead Free Status / Rohs Status
General Hardware Design Considerations—Intel
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.
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
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.
• 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
using an external oscillator.
For explanations of the
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
IXP42X product line and IXC1100 control
column abbreviations, see
Table 21 on page
Hardware Design Guidelines