A C 2 0 8 F E A T U R E S
AC208
24
32
24-Port Dual Speed Repeater
100 Mbps
MII
R-MII
7-Wire
CPU
AC208
AC206
8
5
10 Mbps
SOHO Router
T1/ISDN
xDSL
Cable Modem
AC208
8
AC208
8
AC208
8
8-Port Dual Speed Repeater
16-Port Dual Speed Repeater
AC208
23-Port Dual Speed Repeater
AC208 with AC206 System Block Diagram
AC208 is the first chip of the AC208 product family
with the same architecture and fabrication technology.
Other members of the product family include AC207,
AC206, AC205 and AC205i.
Provides easy product migration.
Provides seamless integration for WAN connections
and system expansion.
Includes lowest overall cost and form factor for 10/100
repeater hub and SOHO gateway and router design.
Field-proven, industry-standard 10BASE-T/100BASE-
TX Fast Ethernet transceivers lower overall system
interoperability and reliability risks.
Integrated memory reduces component cost and
manufacturing and testing costs.
Low power consumption and low heat dissipation
allows high design density and low system cost.
EEPROM-configured system parameter enables cost-
sensitive architecture.
Repeater backplane compatibility with AC108R
enables flexibility and expandability in system
architecture.
S U M M A R Y O F B E N E F I T S
8-PORT ULTRA LOW POWER 10/100 ETHERNET BRIDGED REPEATER
PRODUCT
PRODUCT
Brief
Brief
A C 2 0 8
The highest level of silicon integration achieved for an
eight-port 10/100 bridged repeater
The AC208 integrates:
Eight transceivers of 10BASE-T/100BASE-TX
One uplink port
10M repeater
100M repeater
Two-port bridge including:
- 32 KB memory for address table and packet buffer
- Local MAC address filter
- Address table up to 1K entries
Cascadable to 16, 24, and 32 port configuration
Fully compliant auto-negotiation
Very small package 128-pin PQFP
280 sq. mm footprint
Very low power typical < 1.8W
Selectable TX drivers for 1:1 or 1.25:1 transformers to enable
additional power reduction
Cable detect mode typical < .32W
Power down mode typical < .08W
ALTIMA COMMUNICATIONS, INC. CONFIDENTIAL
The Altima AC208 is a highly integrated 0.25u CMOS silicon
solution. It combines all the functions of a 10/100 dual-speed
bridged repeater including PHY transceiver, two internal
repeaters, two repeater backplane busses for expansion, a two-
port bridge with 32 KB embedded memory.
The AC208 contains eight 10BASE-T/100BASE-TX Fast
Ethernet transceivers, one of which can be configured into a full-
duplex uplink port. The transceivers perform all of the physical
layer interface functions for 10BASE-T Ethernet on Category 3,
4, or 5 unshielded twisted pair (UTP) cable and 100BASE-TX
Fast Ethernet on Category 5 UTP cable.
The AC208 represents a marked improvement over the previous
generation of the dual-speed bridged repeater family AC108R.
Because the memory is embedded in the silicon, the AC208
offers the obvious advantage of cost savings in the discrete
memory device. Additionally, a 128-pin PQFP package means
savings in manufacturing and testing.
Because the AC208 has the smallest footprint and the lowest
power consumption, on a per-port basis, of any micro-LAN
solution, when all system costs are considered -- power, heat,
components and real estate -- the AC208 provides the lowest
overall system cost and most reliable design.
The AC208 product family includes the AC208, AC207, AC206,
AC205 and AC205i with the following features and
configurations:
AC208: 128-pin PQFP, eight-port TX with
cascadable backplane
AC207: 128-pin PQFP, eight-port TX with MII or 7-wire
AC206: 128-pin PQFP, five-port TX with MII or reversed MII
or 7-wire, cascadable repeater backplane
AC205: 100-pin PQFP, five-port TX with MII or 7-wire
AC205i: 100-pin PQFP, five-port TX with MII or 7-wire and
single independent TX port for IP phone
A C 2 0 8 O V E R V I E W
. . .
. . .
MUX
R_100
R_10
Bridge
10M
100M
100M RBP
10M RBP
P
H
Y
MII
MII
RBP
32 KB
RAM
P
H
Y
P
H
Y
P
H
Y
P
H
Y
TX4
TX3
TX2
P
H
Y
P
H
Y
P
H
Y
TX7
Up Link
TX6
TX5
TX1
TX0
10M RBP
100M RBP
2002 by ALTIMA COMMUNICATIONS, INC.
A Broadcom Company. All rights reserved.
AC208-PB03-R-11.01.02
ALTIMA COMMUNICATIONS, INC.
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
ALTIMA COMMUNICATIONS, INC. CONFIDENTIAL
AC208 Block Diagram
Integrated PHY, Repeater and
Bridge
Integrated Packet Buffer Memory
Integrated 1K MAC
Programmable LEDs via EEPROM
Backplane for Cascading
PDF 
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