741 Calle Plano

Camarillo, CA 93012, USA

Tel: +1 805.388.3700

Fax: +1 805.987.5896

www.vitesse.com

The VSC8558 is a low power octal Gigabit

Ethernet transceiver ideal for mulit-port

switch and router applications. The device's

compact BGA package is optimal for

high-density switch applications. Vitesse's mixed signal and

DSP architecture yield robust performance, supporting both.

full and half duplex 10BASE-T, 100BASE-TX, and 1000BASE-T

over >140m of Category 5, unshielded twisted pair (UTP) cable,

with industry leading tolerance to NEXT, FEXT, Echo, and

system noise. The VSC8558's dual 1.25 Gbps SerDes per port

allows for simulatneous support of SGMII/1000BASE-X MACs

to SerDes or copper media on a per port basis.

GENERAL DESCRIPTION:

BLOCK DIAGRAM:

VSC8558

For more information on Vitesse Products visit the Vitesse web site

at www.vitesse.com or contact Vitesse Sales at (800) VITESSE

or sales@vitesse.com

©2005 Vitesse Semiconductor Corporation

Vitesse, ASIC-Friendly, FibreTimer, TimeStream and Snoop Loop are trademarks of Vitesse Semiconductor Corporation.

All other trademarks or registered trademarks mentioned herein are the property of their respective holders. Vitesse

Semiconductor Corporation ("Vitesse") retains the right to make changes to its products or specifications to improve

performance, reliability or manufacturability. All information in this document, including descriptions of features,

functions, performance, technical specifications and availability, is subject to change without notice at any time.

Octal Port 10/100/1000BASE-T and 1000BASE-X PHY

LED INTERFACE

10/100/

1000BASE-T

PCS

LED[3:0]_n

CLKOUT

REF_FILT_B

XTAL1/2

REF_REXT_B

MAC_TDP_n

MAC_TDN_n

MAC I/F

MAC_RDP_n

MAC_RDN_n

TXVP_A_n

TXVN_A_n

TXVP_B_n

TXVN_B_n

TXVP_C_n

TXVN_C_n

TXVP_D_n

TXVN_D_n

PLL

JTAG

MANAGEMENT

& CONTROL

INTERFACE

CMODE[7:0]

RESET

EECLK

EEDAT

MDINT_n

MDIO

MDC

MDI

Twisted Pair

Interface

10/100/

1000BASE-T

PMA

1000BASE-X

PCS

1000BASE-X

PMA

MDI

SerDes

Interface

REF_FILT_A

REF_REXT_A

SER_DOP_n

SER_DON_n

SER_DIP_n

SER_DIN_n

SIGDET_n /

GPIO[7:0]

GPIO[15:8]