Avila Network Computer Operating Manual
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Processor
The Intel
®
Xscale
®
network processor line includes the IXP420, IXP422 and
IXP425 processors. The features common to these processors are listed below.
The primary difference between these processors is support for encryption,
operating speed, operating temperature and cost. See the following table below
for the differences between the processor families. The factory default GW2348-
4 includes the IXP425 processor.
•
StrongARM Version 5TE Compliant
•
Network processing engines to offload Ethernet filtering
•
32-bit SDRAM interface operating at 133MHz
•
32-bit PCI interface operating at 33MHz for Mini-PCI support
•
16-bit Expansion interface for Flash support
•
Two 802.3 MII/RMII interfaces for Ethernet PHY support
•
USB 1.1 device controller
•
Two serial ports
•
Four internal timers
•
Internal bus performance monitoring unit
•
General purpose Input/Outputs
•
Watchdog Timer
Feature IXP420
IXP422
IXP425
Speed (MHz)
266, 400, 533
266
266, 400, 533
Hardware Encryption
No
Yes
Yes
Extended Temperature
266 only
No
266, 400, 533
Cost Low
Mid
High
IXP42x Processor Feature Comparison
SDRAM
The DRAM resides in two synchronous DRAM devices soldered directly to the
board. This architecture supports SDRAM memory capacities from 32Mbytes up
to 128Mbytes. The 32-bit SDRAM interface operates at 133MHz. The factory
default GW2348-4 includes 64Mbytes of SDRAM.
Flash
The Flash resides in one or two J3 Intel StrataFlash
®
devices soldered directly to
the board. This architecture supports Flash memory capacities from 4Mbytes up
to 32Mbytes. The factory default GW2348-4 includes 16Mbytes of Flash in a
single device.
