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(Advance Version

IP178A

8-Port 10/100 Ethernet Integrated Switch

Feature

Three-in-one 8 port 10/100 Ethernet switch

- Built in an 8 port Ethernet switch engine

-

Built in 8 10/100M transceivers

-

Built in SSRAM

Support flow control

- Support IEEE802.3x for full duplex mode operation

- Support backpressure for half duplex mode

operation

Built in up to 1K MAC address

An 8 port switching fabric

- Support two-level hashing algorithm to improve

address collision

- Support address aging

-

Store and forward mode

-

Broadcast storm protection

-

Full line speed capability of 148800 (14880)

packets/sec for 100M (10M)

-

Support 1536 byte data transfer for VLAN traffic

-

Support one MII port

-

Support port base VLAN

-

Support CoS

DSP approach transceivers

-

Auto negotiation

-

Fully digital adaptive equalizer and timing recovery

module

-

Base line Wander correction

-

10BaseT, 100BaseT, and 100BaseFX(port6, port7

only) operation

-

Automatic MDI/MDI-X configuration

LED status of Link, Receive, Full duplex, and Speed

LED with power on diagnostic function

Set operation parameters via pins or EEPROM

Preliminary, Specification subject to change without notice

IP178A-DS-P05

Sep. 09, 2002

interface

Utilize single clock source (25Mhz)

Utilize single power supply (2.5v)

0.25um technology

Packaged in 208 pin PQFP

General Description

IP178A is an 8 port 10/100 Ethernet integrated switch. It

consists of an 8-port switch controller and eight Fast

Ethernet transceivers. Each of the transceivers complies

with the IEEE802.3, IEEE802.3u, and IEEE802.3x

specifications. The transceivers in IP178A are designed

in DSP approach with advance 0.25um technology; this

results in high noise immunity and robust performance.

Two ports of IP178A can be configured as 100BaseFX.

The IP178A operates in store and forward mode. It

stores the incoming packet to the internal SSRAM and

learns the SA (source address) automatically if the

packet is error free. The SA is stored to the internal

address table. IP178A forwards a packet according to DA

and address table. When the segments of destination

ports are free, it reads the packet from the internal

SSRAM and forwards it to the appropriate ports

according to the address table. The incoming packets

with errors are dropped. IP178A supports IEEE802.3x,

optional backpressure, Auto MDI/MDI-X, CoS, port base

VLAN, one MII port and various LED functions, etc.

These functions can be configured to fit the different

requirements by feeding operation parameters via

EEPROM interface or pull up/down resistors on specified

pins.

1

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