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Author:Parthiv Pandya



Microchip Technology, Inc.

 2017 Microchip Technology Inc.DS00002577A-page 1

INTRODUCTION

Microchip’s family of gigabit Ethernet switches have powerful capabilities that may be enabled using various methods

of configuration. Depending on the features needed in the network application, there are four primary methods to con-

figure these switches. This application note describes available switch configuration methods and options with their

associated trade-offs, allowing the developer to choose the best method for their application.

The following configuration options are available (applicable Microchip parts):

• Configuration Straps (KSZ9896C, KSZ9897R, KSZ9897S)

• Microcontroller Configuration(KSZ9897R, KSZ9897S)

•Ethernet In-Band Access (IBA) Configuration(KSZ9897R, KSZ9897S)

• Host Processor Configuration (KSZ8567R, KSZ9897R, KSZ9897S, KSZ9567R, KSZ9567S, KSZ9477S)

TABLE 1:AVAILABLE CONFIGURATION METHODS PER FEATURE - REFERENCE TABLE

Basic

Auto-Neg

EEE

VLAN

QoS

IEEE

1588 v2

802.1x 

Security

ACL

PME

WoL

AVB

DLR/HSR

Config. StrapX X

8-bit MCUX X X X X X X X X X

IBA XXXXX X

Host ProcessorX X X X X X X X X X X X

Note: The user should take note of the difference between switch configuration mode and switch management

mode. Switch management mode provides the added ability to send and receive Ethernet frames during

normal operation. Switch configuration mode does not provide this ability.

CONFIGURATION STRAPS

The configuration strap option is a hardware method to configure the switch where pull-up or pull-down resistors are

used to set the logic level high or low on strapping pins of the switch. For example, the KSZ9896C has several strapping

pins with internal weak pull-up or pull-down resistors which allow the switch to operate in the unmanaged mode. A user

can add 1KΩ to 10KΩ external pull-up resistors on non-LED pins, or 750Ω to 1KΩ pull-down resistors on LED strapping

pins to override the effect of the weak internal resistors.

The strapping pins exhibit very high impedance when the device is in reset. They are internally sampled at the rising

edge of the reset pin, RESET_N. Once the RESET_N pin is high, all of these pins become driven outputs.

The user must be aware that the internal pull-up/pull-down resistors are weak. Therefore, if the application board uses

any external pull-up or pull-down resistors, care must be taken. If an external processor is connected with a switch, the

processor should also be checked for internal pull-ups or pull-downs, and it may be necessary to add an external resistor

to reinforce the default internal resistor of the Microchip switch. The KSZ9xxx family’s datasheet lists all the strapping

pins, their functionalities and default values.

AN2577

Getting Started with Gigabit Ethernet Switch

Configuration Options

Product specificaties