GWIXP425BDT datasheet(33/134 Pages) INTEL

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

Datasheet

March 2005

Document Number: 252479, Revision: 005

3.0

Functional Signal Descriptions

Listed in the signal definition tables — starting at Table 6 “SDRAM Interface” on page 34 — are

pull-up an pull-down resistor recommendations that are required when the particular enabled

interface is not being used in the application. These external resistor requirements are only needed

if the particular model of Intel® IXP42X product line and IXC1100 control plane processors has

the particular interface enabled and the interface is not required in the application.

Warning:

All IXP42X product line and IXC1100 control plane processors I/O pins are not 5-V tolerant.

Disabled features, within the IXP42X product line and IXC1100 control plane 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.

Table 5 presents the legend for interpreting the Type field in the other tables in this section of the

document.

To determine which interfaces are not enabled within the IXP42X product line and IXC1100

control plane processors, see Table 3 on page 14.

Other tables in this section include:

• Table 6 — SDRAM Interface signals

• Table 7 — PCI Controller signals

Table 5.

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, Z

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

Pull-up Enabled, equivalent to H

Tri

Output Only/Tristatable

N/C

No Connect

Pin must be connected as described

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