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PDF AC208 Data sheet ( Hoja de datos )
| Número de pieza | AC208 | |
| Descripción | 2.5V 10/100-TX 5-Port Repeater/4+1 Uplink Port | |
| Fabricantes | ETC | |
| Logotipo |  |
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ADVANCE DATA SHEET
n AC206
2.5V 10/100-TX 5-Port Repeater/4+1 Uplink Port with Bridge Controller
GENERAL DESCRIPTION
The AC206 is a 5-port 10/100Mbps integrated repeater with
a bridge controller. The AC206 provides a low cost, inte-
grated solution for unmanaged repeater applications.
The AC206 is a Class II Repeater that is fully compliant with
IEEE 802.3 standards. The device provides five 10/100
Mbps copper media ports. In addition, the 5th port supports
a 10/100 TX interface for uplink functionality. The AC206
also provides one selectable MII/7-wire interface. The MII/
7-wire interface can be connected to a MAC or a Switch for
managed repeater stack or hybrid Switch/Repeater Appli-
cations.
The AC206 provides 10/100 Mbps auto-negotiation and
parallel detection for all ports. The option to configure the
technology for each port via EEPROM interface is avail-
able. The AC206 provides two internal repeater state ma-
chines, one operates at 10Mbps and the other at 100Mbps.
Once the technology is set, the device automatically con-
nects each port to the appropriate repeater segment.
The AC206 provides two backplanes for expansion. One
operates at 10Mbps, the other at 100Mbps. Up to 20 ports
can be connected into one repeater using backplane buses.
The AC206 integrates repeater controller and switch engine
technologies with “store and forward” forwarding mecha-
nisms.
FEATURES
• Low power (<1A total current consumption when used
with 1.25;1 transformer) five port 10/100 Mbps inte-
grated repeater controller with built-in bridge function.
• MDC/MDIO for control/status.
• Five integrated 10/100 Mbps IEEE 802.3u compliant
transceivers.
• Fully integrated adaptive equalizer provides phase/
amplitude compensation for various cable lengths up to
30dB @ 100MHz.
• Patent-pending DC restoration technique reduces off-
set/baseline wander.
• IEEE 802.3u-compliant auto-negotiation.
• Unique scrambler seed for all port for better EMI.
• Supports Media Independent Interface (MII) or 7-wire
interface to connect to MAC.
• Cascadable backplanes compatible with AC108RM,
AC108RU and AC208.
• Non-blocking 10/100M bridge with MAC controller and
switching engine. One segment of a bridge is fixed to
100Mbps while the other can be configured for 10 or
100Mbps.
• Bridge functions include:
- Embedded 32K bytes 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, par-
tition, utilization, and collision rate.
• Advanced power management includes:
- Each port can be turned off independently.
- Standby mode, which reduces power when the port
is not connected.
• Low power 2.5V 0.25µm CMOS implementation with
128-pin QFP package.
• Input tolerance to 3.3V
10M R BP
100M R BP
M II/
7 -W ire /
R v -M II
2 5 6 K b its
RAM
M II
B rid g e
T o R v -M II
M II
100M R B P
10M R BP
R _100
R _10
RBP
M
U 7 W ire
X
R v -M II
10M
100M
M II
...
M UX
...
PPPPP
HHHHH
YYYYY
Figure 1:
(T X 0 ) (T X 1 ) (T X 2 )
Functional Block Diagram
(T X 3 )
(T X 4 )
U p L in k
16215 Alton Parkway • P.O. Box 57013 • Irvine, California 92619-7013 • Phone: 949-450-8700 • Fax: 949-450-8710
AC206-DS03-R
06/19/01
1 page  
Advance Data Sheet
06/19/01
I AC206
LED Effect with Speed100 Event.......................................................................................................... 32
LED Register Control Mode .................................................................................................................. 33
EEPROM Table ........................................................................................................................................... 33
4B/5B Code-Group Table ..................................................................................................................... 34
LED Display Matrix..................................................................................................................................... 35
System Considerations ......................................................................................................................... 35
Section 4: Electrical Characteristics................................................................................ 37
Absolute Maximum Ratings ...................................................................................................................... 37
Operating Range ........................................................................................................................................ 37
REFCLK Pins........................................................................................................................................ 38
I/O Characteristics – LED Pins ............................................................................................................. 38
100 BASE-TX Transceiver Characteristics ........................................................................................... 39
10 BASE-T Transceiver Characteristics................................................................................................ 40
Section 5: Digital Timing Characteristics ........................................................................ 41
Power on Reset .......................................................................................................................................... 41
Management Data Interface ...................................................................................................................... 42
7-Wire Input Timing.................................................................................................................................... 43
7-Wire Output Timing................................................................................................................................. 44
100BASE-TX MII Input Timing ................................................................................................................... 45
100BASE-TX MII Output Timing ................................................................................................................ 46
10BASE-TX MII Input Timing ..................................................................................................................... 47
10BASE-TX MII Output Timing .................................................................................................................. 48
100Mbps Repeater BackPlane Receive/Transmit Timing....................................................................... 49
10Mbps Repeater BackPlane Receive/Transmit Timing......................................................................... 50
EEPROM Interface Timing ......................................................................................................................... 51
10/100BASE-TX Reverse MII Output Timing ............................................................................................ 52
10/100BASE-TX Reverse MII Input Timing ............................................................................................... 52
LED Timing ................................................................................................................................................. 53
TX Application Termination ...................................................................................................................... 54
Section 6: Mechanical Information................................................................................... 55
Section 7: Ordering Information.......................................................................................56
Document AC206-DS03-R
Broadcom
Table of Contents Page v
5 Page 
Advance Data Sheet
06/19/01
I AC206
Section 1: Functional Description
FUNCTIONAL DESCRIPTION
The AC206 is an integrated 10/100 Mbps repeater with bridge function. The device provides eight 10/100BASE-TX twisted
pair interface ports. The AC206 includes a built-in 2-segment switch for 10/100Mbps connection. The AC206 provides the
highest integration chip solution for dual speed hub system. The result is ultra low power consumption that consumes less
than 1A maximum when all ports are running 100BASE-TX full-speed. The built-in power management function powers
down the individual port when not used (no cable detected) which further drives down the power consumption and improves
long-term reliability.
CLOCKS, RESET AND POWER MANAGEMENT FUNCTIONS
The AC206 requires a single 25 MHz clock signal at the CLK input pin. An internal PLL generates all of the clock frequencies
needed by the device from the single clock input.
The AC206 can be reset in two ways:
1 During initial power on.
2 Hardware reset: A logic low signal of 10 µs pulse width applies to RST pin.
During reset, all mode pins latch in, the internal address table is initialized, and the internal state machine is reset to known
states. At the completion of the reset sequence, all ports are enabled for frame reception and transmission.
The AC206 offers the following power management:
• Power down mode: Refer to the Power-down register. For example, port 1 has a base address of Hex 00. During power
down, the device is able to respond through the serial management interface.
• Energy detects mode: The device powers down all of the unused circuitry when the cable is not installed. The Energy
Detect (ED) circuit stays on to monitor incoming signals from the media. The SMI portion is turned on to response to
any management transaction. The transmit circuit sends out a link pulse with minimum power consumption. If a valid
signal is received from the media, the device is powered up and resumes normal transmit/receive operation.
TRANSCEIVER AND TRANSMIT FUNCTION
In 100BASE-TX mode, the Transceiver transmits MLT-3 signal to the cable via isolation transformer. MLT-3 data is a three
level signal data. This data is scrambled when transmitted to the media. The MLT-3 data is synchronous to the 25 MHz clock.
In 10BASE-T mode, Manchester code is generated by the 10BASE-T core logic, which synthesizes through the output wave-
shaping driver. This helps reduce any EMI emission, which eliminates the need for an external filter.
MII
The transmit data on the MII interface is 4-bit nibbles at 25/2.5 MHz rate. This data is transferred from the MAC controller
into the repeater controller via the MII TXD lines. The MAC controller asserts TX_EN during transmission, or forces an error
in the encoded data using TX_ER.
Document AC206-DS03-R
Broadcom
Section 1: Functional Description Page 1
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet AC208.PDF ] | |
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