GWIXP425BCT datasheet(20/134 Pages) INTEL

20 / 134 page

Intel® IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor

March 2005

Datasheet

Document Number: 252479, Revision: 005

2.1

Functional Units

The following sections briefly describe the functional units and their interaction in the system. For

more detailed information, refer to the Intel® IXP42X Product Line of Network Processors and

IXC1100 Control Plane Processor Developer’s Manual.

Unless otherwise specified, the functional descriptions apply to all processors in the IXP42X

product line and IXC1100 control plane processors. Refer to Table 3 on page 14 and Figure 1 on

page 15 through Figure 5 for specific information on supported interfaces

2.1.1

Network Processor Engines (NPEs)

The network processor engines (NPEs) are dedicated-function processors containing hardware

coprocessors integrated into the IXP42X product line and IXC1100 control plane processors. The

NPEs are used to off-load processing functions required by the Intel XScale core.

These NPEs are high-performance, hardware-multi-threaded processors with additional local-

hardware-assist functionality used to off-load highly processor-intensive functions such as MII

(MAC), CRC checking/generation, AAL 2, AES, DES, SHA-1, and MD5. All instruction code for

the NPEs are stored locally with a dedicated instruction memory bus and dedicated data memory

bus.

These NPEs support processing of the dedicated peripherals that can include:

• A Universal Test and Operation PHY Interface for ATM (UTOPIA) 2 interface

• Two High-Speed Serial (HSS) interfaces

• Two Media-Independent Interfaces (MII)

Table 4 specifies which devices, in the IXP42X product line and IXC1100 control plane

processors, have which of these capabilities.

The NPE core is a hardware-multi-threaded processor engine that is used to accelerate functions

that are difficult to achieve high performance in a standard RISC processor. Each NPE core is a 133

MHz processor core that has self-contained instruction memory and self-contained data memory

that operate in parallel.

Table 4.

Processor Functions

Device

UTOPIA

HSS

MII 0

MII 1

AES / DES /

DES3

Multi-Channel

HDLC

SHA-1 /

MD-5

Intel® IXP425 Network

Processor

, B-Step

Intel® IXP423 Network

Processor

Intel® IXP422 Network

Processor

Intel® IXP421 Network

Processor

Intel® IXP420 Network

Processor

Intel® IXC1100 Control

Plane Processor

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