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Intel
®
IXP45X and Intel
®
IXP46X Product Line of Network Processors
February 2007 HDD
Document Number: 305261; Revision: 004 41
General Hardware Design Considerations—Intel
®
IXP45X and Intel
®
IXP46X Product Line of
Network Processors
3.9 UTOPIA Level 2 Interface
The IXP45X/IXP46X network processors support the industry-standard UTOPIA Level 2
bus interface. A dedicated Network Processor Engine (NPE) handles segmentation and
reassembly of ATM cells, CRC checking/generation, and transfer of data to/from
memory. This allows parallel processing of data traffic on the UTOPIA interface, off-
loading processor overhead required by the Intel XScale processor.
The UTOPIA module is configured as a master and can support single-PHY (SPHY) or
multi-PHY (MPHY).
The IXP45X/IXP46X network processors are in compliance with the ATM Forum, UTOPIA
Level 2 Specification, Revision 1.0. For optimal design results, the guidelines of the
specification should be followed.
Figure 12. USB Device Interface Example
18 Ω
22 pF 22 pF
FERRITE
22 pF
FERRITE
22 pF
USB
Port
18 Ω
Intel
®
IXP46X
Product Line
Network Processor
USB_DPOS
(D+)
USB_DNEG
(D-)
HOST
V_BUS
Device Host
D
+
D-
1.5 KΩ
USB_3V3
15 KΩ
15 KΩ
V_BUS
Look at
Note 1&2
B4106-003