IXP45X datasheet(43/148 Pages) INTEL

43 / 148 page

Intel® IXP45X and Intel® IXP46X Product Line of Network Processors

August 2006

Datasheet

Document Number: 306261-004US

Datasheet—Intel® IXP45X and Intel® IXP46X Product Line of Network Processors

4.2

Functional Signal Definitions

The signal definition tables list pull-up and pull-down resistor recommendations when

the particular enabled interface is not being used in the application. These external

resistor requirements are only needed if the particular model of IXP45X/IXP46X

network processors has the particular interface enabled and the interface is not

required in the application.

Warning:

None of the IXP45X/IXP46X network processors’ I/O pins are 5-V tolerant.

Disabled features within the IXP45X/IXP46X network processors do not require

external resistors, as the processor will have internal pull-up or pull-down resistors

enabled as part of the disabled interface. To determine which interfaces are not enabled

within the IXP45X/IXP46X network processors, see Table 1 on page 13.

Table 8 presents the legend for interpreting the Type field in the other tables in this

section of the document.

4.2.1

Pin Description Tables

This section identifies all the signal pins by symbol name, type and description. Names

should follow the following convention, all capital letters with a trailing “_N” indicate a

signal is asserted when driven to a logic low (digital 0). The description includes the full

name of the pin along with a functional description. This section does not specify the

number of power and ground pins required, but does include the number of different

types of power pins required.

Table 8.

Signal Type Definitions

Symbol

Description

Input pin only

Output pin only

I/O

Pin can be either an input or output

Open Drain pin

PWR

Power pin

GND

Ground pin

Driven to Vcc

Driven to Vss

Driven to unknown state

Input is disabled

Pulled up to Vcc

Pulled to Vss

Pull-up Disabled

Output Disabled

A valid output level is driven, allowed states - 1, 0, H

Valid level on the signal, allowed states - 1, 0, H, Z

Need to drive a valid input level, allowed states - 1, 0, H,

VOD

Valid Open Drain output, allowed states are 0 or Z

Pull-up Enabled, equivalent to H

TRI

Output Only/Tristatable

ePU

External 10K ohm Pull-Up is required on the board

N/C

No Connect

Pin must be connected as described

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