GWIXP425BDT datasheet(21/134 Pages) INTEL

21 / 134 page

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

Datasheet

March 2005

Document Number: 252479, Revision: 005

In addition to having separate instruction/data memory and local-code store, the NPE core supports

hardware multi-threading with support for multiple contexts. The support of hardware multi-

threading creates an efficient processor engine with minimal processor stalls due to the ability of

the processor core to switch contexts in a single clock cycle, based on a prioritized/preemptive

basis. The prioritized/preemptive nature of the context switching allows time-critical applications

to be implemented in a low-latency fashion — which is required when processing multi-media

applications.

The NPE core also connects several hardware-based coprocessors that are used to implement

functions that are difficult for a processor to implement. These functions include:

These coprocessors are implemented in hardware, enabling the coprocessors and the NPE

processor core to operate in parallel.

The combined forces of the hardware multi-threading, local-code store, independent instruction

memory, independent data memory, and parallel processing allows the Intel XScale core to be

utilized for application purposes. The multi-processing capability of the peripheral interface

functions allows unparalleled performance to be achieved by the application running on the Intel

XScale core.

2.1.2

Internal Bus

The internal bus architecture of the IXP42X product line and IXC1100 control plane processors is

designed to allow parallel processing to occur and to isolate bus utilization, based on particular

traffic patterns. The bus is segmented into three major buses: the North AHB, South AHB, and

APB.

2.1.2.1

North AHB

The North AHB is a 133.32 MHz, 32-bit bus that can be mastered by the NPEs. The targets of the

North AHB can be the SDRAM or the AHB/AHB bridge. The AHB/AHB bridge allows the NPEs

to access the peripherals and internal targets on the South AHB.

Data transfers by the NPEs on the North AHB to the South AHB are targeted predominately to the

queue manager. Transfers to the AHB/AHB bridge may be “posted,” when writing, or “split,”

when reading.

When a transaction is “posted,” a master on the North AHB requests a write to a peripheral on the

South AHB. If the AHB/AHB Bridge has a free FIFO location, the write request will be transferred

from the master on the North AHB to the AHB/AHB bridge. The AHB/AHB bridge will complete

the write on the South AHB, when it can obtain access to the peripheral on the South AHB. The

North AHB is released to complete another transaction.

When a transaction is “split,” a master on the North AHB requests a read of a peripheral on the

South AHB. If the AHB/AHB bridge has a free FIFO location, the read request will be transferred

from the master on the North AHB to the AHB/AHB bridge. The AHB/AHB bridge will complete

the read on the South AHB, when it can obtain access to the peripheral on the South AHB.

• Serialization/De-serialization

• CRC checking/generation

• DES/3DES/AES

• SHA-1

• MD5

• HDLC bit stuffing/de-stuffing

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