Datasheet > KSZ8993

KSZ8993

更新时间： 2024-11-06 03:48:51

品牌	Logo	应用领域
麦瑞 - MICREL		局域网（LAN）标准
页数	文件大小	规格书
35页	224K
描述
3-Port 10/100 Integrated Switch with PHY and Frame Buffer

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KSZ8993 数据手册

KS8993

Micrel

KS8993

3-Port 10/100 Integrated Switch with PHY and Frame Buffer

Rev. 2.05

The KS8993 has rich features such as VLAN and priority

queuing and is designed to reside in an unmanaged design

notrequiringprocessorintervention.Thisisachievedthrough

I/O strapping at system reset time.

General Description

The KS8993 contains three 10/100 physical layer transceiv-

ers, three MAC (Media Access Control) units with an inte-

grated layer 2 switch. The device runs in two modes. The first

mode is a three port integrated switch and the second is as

a three port switch with the third port decoupled from the

physicalport.InthismodeaccesstothethirdMACisprovided

using a reverse or forward MII (Media Independent Interface)

such that an external MAC can be directly connected to the

KS8993. This interface also supports the 7-wire (serial net-

work interface) as used by some routing devices.

On the media side, the KS8993 supports 10BaseT,

100BaseTX and 100BaseFX as specified by the IEEE 802.3

committee.

Physical signal transmission and reception are enhanced

through use of analog circuitry that makes the design more

efficient and allows for lower power consumption and smaller

chip die size.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

Useful configurations include a stand alone three port switch

as well as a two port switch with a routing element connected

to the extra MII port. The additional port is also useful for

public network interfacing.

Functional Diagram

Look-Up

Engine

(1K Entries)

SRAM

Buffers

(16Kx32)

Queue

Management

Buffer

Management

FIFO and Flow Control

MRXD[3:0]

MRXDV

MCOL

MAC

MCRS

MRXCLK

MTXD[3:0]

MTXEN

MTXER

MII / SNI

MTXCLK

MCOLIN

(exclusive)

External

MRXD[0]

MRXDV

MCOL

Interface

Physical

Transceiver

Physical

Transceiver

Physical

Transceiver

MRXCLK

MTXD[0]

MTXEN

MTXCLK

LED

and

Programming

Interface

LED[1][3:0]

LED[2][3:0]

LED[3][3:0]

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

May 2005

KS8993

12 3 4 5 6 7...35

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