Instrukcja obsługi Microchip KSZ9563

Microchip Niesklasyfikowane KSZ9563

Przeczytaj poniżej 📖 instrukcję obsługi w języku polskim dla Microchip KSZ9563 (11 stron) w kategorii Niesklasyfikowane. Ta instrukcja była pomocna dla 3 osób i została oceniona przez 2 użytkowników na średnio 4.5 gwiazdek

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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. Strap X X

8-bit MCU X X X X X X X X X X

IBA XXXXX X

Host Processor X 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

AN2577

DS00002577A-page 2  2017 Microchip Technology Inc.

An unmanaged Ethernet switch allows a quick and easy commissioning of the Ethernet network. A wide range of appli-

cations, including industrial control applications, can benefit tremendously from adding an unmanaged Ethernet switch,

as it reduces the cost and complexity for the Ethernet network.

Unlike a managed switch, an unmanaged Ethernet switch does not require any external microcontroller, microprocessor

or SoC to manage its functions. It can easily be configured using strap-in options of the switch. Because of its ease of

use it is also known as a “plug and play” device.

Example Configuration

The Figure 1 example circuit details the KSZ9896C switch in unmanaged mode using configuration straps. The circuit

enables auto-negotiation and the SPI interface (to access the internal registers for debugging purposes), sets port 6 to

100Mbps RMII mode. It can be seen from the datasheet table that apart from configuring port 6 in RMII mode and select-

ing the 100Mbps port 6 speed, the remaining options are set by default. Therefore, a user only needs to use external

pull-up resistors as shown in the Table 2.

FIGURE 1: EXAMPLE CONFIGURATION CIRCUIT

KSZ9896C

10KOhm

RXD6_2

RXD6_0

VDDIO

10KOhm

VDDIO

TABLE 2: CONFIGURATION EXAMPLE

PIN NUMBER CONFIGURATION

STRAP PIN DESCRIPTION

62, 63 RXD6_3, RXD6_2 Port 6 Mode

01: RMII

Note: RXD6_3 includes an internal pull-down resistor.

65 RXD6_0 Port 6 Speed Select

1: 100Mbps Mode

Note: If Port 6 is configured for MII or RMII, set the speed to

100Mbps.

 2017 Microchip Technology Inc. DS00002577A-page 3

AN2577

MICROCONTROLLER CONFIGURATION

In this switch configuration method, the switch’s serial bus such as, SPI or I

2C is connected to a small microcontroller

to configure its internal functions. The switch acts as a I

2C slave device in the system. Using this serial bus, the micro-

controller writes configuration registers during power up of the device, as described in the management interface portion

of the data sheet. Configuration strap pins are used to determine the interface mode the switch operates in. For exam-

ple, in the KSZ9897R, the LED4_1 and LED3_1 pins decide the configuration interface:

LED4_1 LED3_1 = 01 = I2C Interface Mode

LED4_1 LED3_1 = 1X = SPI Slave Mode

In this method, the serial interface provides access to the switch and PHY access registers. The serial interface pro-

vides access to the switch and PHY access registers. Between these two interfaces, SPI is the fastest speed. For exam-

ple, the KSZ9897 supports up to a 50 MHz bus speed in SPI mode, whereas it only supports a 400Kb bus speed in I

mode.

Example Configuration

In this example, the switch’s VLAN will be enabled via the SPI or I

2C interface. Figure 2 3 and Figure detail the example

circuits for SPI and I2C interfaces, respectively. To enable the VLAN, the user must write the following register:

Switch Lookup Engine Control 0 Register: Address 0x0310, bit 7 = 1b

FIGURE 2: SPI INTERFACE CONNECTIONS WITH MCU

SPIInterface

10K

VDDIO

StraptoenableSPI

MCU KSZ9897R

SCL

SDI

SDO

SCS_N

SCL

SDO

SDI

SCS_N

10K

VDDIO

1K – 4.7K

LED4_1

Specyfikacje produktu

Marka:	Microchip
Kategoria:	Niesklasyfikowane
Model:	KSZ9563

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