PRELIMINARY DATA SHEET
AC206
2.5V 10/100-TX 5-Port Repeater with Integrated Bridge
G E N E R A L D E S C R I P T I O N
F E A T U R E S
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.
• Patent-pending DC restoration technique reduces offset/
baseline wander.
• IEEE 802.3u-compliant auto-negotiation.
• Unique scrambler seed for all port for better EMI.
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.
• 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.
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.
• Bridge functions include:
- Embedded 32 KB memory for address table and
packet buffer.
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.
- Local MAC address filtering.
- XOR hashing scheme.
- Short routing decision time.
- Forwarding schemes: store-and-forward.
- Address table up to 1K entries.
The AC206 integrates repeater and bridge technologies
with store-and-forward forwarding mechanisms.
• Programmable LED display for activity, link, speed,
F E A T U R E S
partition, utilization, and collision rate.
• Advanced power management includes:
• 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.
- Each transceiver port can be turned off
independently.
- Standby mode, which reduces power when the port
is not connected.
• MDC/MDIO for control/status of transceiver components.
• Five integrated 10/100 Mbps IEEE 802.3u compliant
• Low-power 2.5V 0.25 µm CMOS implementation with
transceivers.
128-pin QFP package.
• Fully integrated adaptive equalizer provides phase/
amplitude compensation for various cable lengths up to
30 dB at 100 MHz.
• Input tolerance to 3.3V.
T o R v -M II
2 5 6 K b its
R A M
B rid g e
M II
M II
1 0 M R B P
1 0 0 M R B P
R _ 1 0 0
R _ 1 0
. . .
. . .
1 0 M
1 0 0 M
M II
1 0 M R B P
R B P
1 0 0 M R B P
M U X
M II/
7 -W ire /
R v -M II
M
U
X
7 W ire
P
H
Y
P
H
Y
P
H
Y
P
H
Y
P
H
Y
R v -M II
(T X 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