IXP42X datasheet(19/112 Pages) INTEL

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Intel® IXP42X Product Line and IXC1100 Control Plane Processor

Functional Overview

Datasheet

Once the AHB/AHB bridge has obtained the read information from the peripheral on the South

AHB, the AHB/AHB bridge notifies the arbiter, on the North AHB, that the AHB/AHB bridge has

the data for the master that requested the “split” transfer. The master on the North AHB — that

requested the split transfer — will arbitrate for the North AHB and transfer the read data from the

AHB/AHB bridge. The North AHB is released to complete another transaction while the North

AHB master — that requested the “split” transfer — waits for the data to arrive.

These “posting” and “splitting” transfers allow control of the North AHB to be given to another

master on the North AHB — enabling the North AHB to achieve maximum efficiency. Transfers to

the AHB/AHB bridge are considered to be small and infrequent, relative to the traffic passed

between the NPEs on the North AHB and the SDRAM.

2.1.2.2

South AHB

The South AHB is a 133.32-MHz, 32-bit bus that can be mastered by the Intel XScale® Core, PCI

controller, and the AHB/AHB bridge. The targets of the South AHB Bus can be the SDRAM, PCI

interface, queue manager, expansion bus, or the APB/AHB bridge.

Accessing across the APB/AHB bridge allows interfacing to peripherals attached to the APB.

2.1.2.3

APB Bus

The APB Bus is a 66.66-MHz (which is 2 * OSC_IN input pin.), 32-bit bus that can be mastered by

the AHB/APB bridge only. The targets of the APB bus can be:

The APB interface is also used as an alternate-path interface to the NPEs and is used for NPE code

download and configuration.

2.1.3

MII Interfaces

Two industry-standard, media-independent interface (MII) interfaces are integrated into most of

the IXP42X product line and IXC1100 control plane processors with separate media-access

controllers and independent network processing engines. (See Table 3 on page 17.)

The independent NPEs and MACs allow parallel processing of data traffic on the MII interfaces

and off-loading of processing required by the Intel XScale® Core. The IXP42X product line and

IXC1100 control plane processors are compliant with the IEEE, 802.3 specification.

In addition to two MII interfaces, the IXP42X product line and IXC1100 control plane processors

include a single management data interface that is used to configure and control PHY devices that

are connected to the MII interface.

• High-speed UART interface

• Console UART interface

• USB v 1.1 interface

• All NPEs

• Internal bus performance monitoring unit

(IBPMU)

• Interrupt controller

• GPIO

• Timers

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