PRIXP425BD datasheet(17/112 Pages) INTEL

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Intel® IXP42X Product Line and IXC1100 Control Plane Processor

Functional Overview

Datasheet

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 1 on page 12 and Figure 1 on

page 14 through Figure 4 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 3 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 3. 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® IXP422 Network

Processor

Intel® IXP421 Network

Processor

Intel® IXP420 Network

Processor

Intel® IXC1100 Control

Plane Processor

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