KSZ8999I Datasheet

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KS8999

Micrel

KS8999

Integrated 9-Port 10/100 Switch with PHY and Frame Buffer

Rev. 1.14

General Description

The KS8999 contains eight 10/100 physical layer transceiv-

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

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

mode is an eight port integrated switch and the second is as

a nine port switch with the ninth port available through an MII

(Media Independent Interface). Useful configurations include

a stand alone eight port switch as well as a eight port switch

with a routing element connected to the extra MII port. The

additional port is also useful for a public network interfacing.The

KS8999 is designed to reside in an unmanaged design not

requiring processor intervention. This is achieved through

I/O strapping or EEPROM programming at system reset

time.On the media side, the KS8999 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 consump-

tion and smaller chip die size.

Data sheets and support documentation can be found on

Micrel鈥檚 web site at www.micrel.com.

Functional Diagram

Look Up

Engine

(1K Entries)

Queue Priority

Management

Buffer

Management

SRAM

Buffers

FIFO, Flow Control, VLAN and Priority

M

A

C

1

M

A

C

2

M

A

C

3

M

A

C

4

M

A

C

5

M

A

C

6

M

A

C

7

M

A

C

8

M

A

C

9

P

H

Y

1

P

H

Y

2

P

H

Y

3

P

H

Y

4

P

H

Y

5

P

H

Y

6

P

H

Y

7

P

H

Y

8

MII /

SNI

(exclusive)

External

Interface

M

I

I

MRXD[3:0]

MRXDV

MCOL

MCRS

MTXD[3:0]

MTXEN

MTXER

MTXC

MRXC

MRXD[0]

MRXDV

MCOL

EEPROM /

Processor

Interface

SCL

SDA

LED

and

Programming

Interface

LED[1][3:0]

LED[2][3:0]

LED[3][3:0]

LED[4][3:0]

LED[5][3:0]

LED[6][3:0]

LED[7][3:0]

LED[8][3:0]

LED[9][3:0]

S

N

I

MTXD[0]

MTXEN

MTXC

MRXC

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

January 2005

1

KS8999

next

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