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KSZ8999中文资料

January 20051KS8999

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

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.doczj.com/doc/09dd66f704a1b0717fd5dd3e.html

Functional Diagram

P H Y 1

Look Up Engine (1K Entries)

SRAM Buffers

FIFO, Flow Control, VLAN and Priority

Queue Priority Management Buffer Management LED and

Programming Interface

LED[1][3:0]LED[2][3:0]LED[3][3:0]LED[4][3:0]LED[5][3:0]EEPROM /Processor Interface

SCL SDA

LED[6][3:0]LED[7][3:0]LED[8][3:0]LED[9][3:0]

MII /SNI (exclusive)External Interface

MRXD[3:0]MRXDV MCOL MTXD[3:0]MTXEN MTXER MRXC MRXD[0]MRXDV MCOL

MTXD[0]MTXEN MRXC

S N I

M I I

MTXC MCRS MTXC M A C 1

P H Y 2

M A C 2

P H Y 3

M A C 3

P H Y 4

M A C 4

P H Y 5

M A C 5

P H Y 6

M A C 6

P H Y 7

M A C 7

P H Y 8

M A C 8

M A C 9

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,100Bas
eTX and 100BaseFX as specified by the IEEE 802.3committee. 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.

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 802.3committee. 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’s web site at http://www.doczj.com/doc/09dd66f704a1b0717fd5dd3e.html .

元器件交易网http://www.doczj.com/doc/09dd66f704a1b0717fd5dd3e.html

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