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AC206KQM

2.5V 10/100-TX 5-Port Repeater with Integrated Bridge

Broadcom Corporation 

PRELIMINARY DATA SHEET

AC206

2.5V 10/100-TX 5-Port Repeater with Integrated Bridge

GENERAL DESCRIPTION

The AC206 is an unmanaged five-port 10/100 Mbps

repeater with an integrated bridge. The AC206 provides a

low-cost, integrated solution for unmanaged repeater

applications.

The AC206 is a Class II Repeater. The device provides five

10/100 Mbps copper media ports. The AC206 also provides

one selectable MII/seven-wire interface. The MII/seven-

wire interface can be connected to a MAC.

The AC206 provides 10/100 Mbps auto-negotiation and

parallel detection for all ports. The option to configure the

device for each port via EEPROM interface is available. The

AC206 provides two internal repeater state machines, one

operates at 10 Mbps and the other at 100 Mbps. When the

technology is set, the device automatically connects each

port to the appropriate repeater segment.

The AC206 provides two backplanes for expansion, one

operates at 10 Mbps and the other at 100 Mbps. Up to 20

ports can be connected into one repeater using backplane

buses.

The AC206 integrates repeater and bridge technologies

with store-and-forward forwarding mechanisms.

FEATURES

• Low-power (less than 1A total current consumption when

used with 1.25:1 transformer) five-port 10/100 Mbps

repeater with built-in bridge function.

• MDC/MDIO for control/status of transceiver components.

• Five integrated 10/100 Mbps IEEE 802.3u compliant

transceivers.

• Fully integrated adaptive equalizer provides phase/

amplitude compensation for various cable lengths up to

30 dB at 100 MHz.

FEATURES

• Patent-pending DC restoration technique reduces offset/

baseline wander.

• IEEE 802.3u-compliant auto-negotiation.

• Unique scrambler seed for all port for better EMI.

• Supports Media Independent Interface (MII) or seven-

wire interface to connect to MAC.

• Cascadable backplane compatible with AC208.

• Non-blocking 10/100M bridge with MAC controller and

switching engine. One segment of a bridge is fixed to

100 Mbps, while the other can be configured for 10 or

100 Mbps.

• Bridge functions include:

- Embedded 32 KB memory for address table and

packet buffer.

- Local MAC address filtering.

- XOR hashing scheme.

- Short routing decision time.

- Forwarding schemes: store-and-forward.

- Address table up to 1K entries.

• Programmable LED display for activity, link, speed,

partition, utilization, and collision rate.

• Advanced power management includes:

- Each transceiver port can be turned off

independently.

- Standby mode, which reduces power when the port

is not connected.

• Low-power 2.5V 0.25 µm CMOS implementation with

128-pin QFP package.

• Input tolerance to 3.3V.

10M RBP

100M RBP

M II/

7 -W ire /

R v-M II

25 6K b its

RAM

M II

B rid g e

T o R v-M II

M II

100M RBP

10M RBP

R _100

R_10

RBP

M

U

7 W ire

X

R v-M II

10M

100M

M II

...

...

MUX

P

P

P

P

P

H

H

H

H

H

Y

Y

Y

Y

Y

(TX 0 ) (T X 1) (T X 2 ) (T X 3 ) (T X 4)

U p L in k

Figure 1: Functional Block Diagram

AC206-DS05-405-R

16215 Alton Parkway • P.O. Box 57013 • Irvine, California 92619-7013 • Phone: 949-450-8700 • Fax: 949-450-8710

07/08/02

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