bcm54881 Broadcom Corp., bcm54881 Datasheet - Page 2

• Manufacturer Part Number: bcm54881
• Description: Octal 10/100base-tx Ethernet Broadr-reach Transceiver
• Manufacturer: Broadcom Corp.

The BCM54881 is a member of Broadcom’s BroadR-Reach family of
copper PHY products. It includes eight complete 10/100BASE-TX and
BroadR-Reach transceivers integrated on a single 65 nm CMOS chip.
The BCM54881 includes eight S3MII serial media access controller
(MAC) interfaces and eight copper ports, whereby each copper port
supports one, two, or four twisted pair line connections.
BroadR-Reach technology supports both 100-meter traditional Ethernet
services and other applications that require longer than 100-meter reach
or operation over a single twisted wire pair (such as FTTC/FFTB in
MTU/MDU and hotels). The extended reach will also broaden the range
of cable installations and can be used for new IP services and
applications such as broadband access, voice over IP, wireless access
points, and surveillance cameras.
In contrast to previous technologies that extended the range of Ethernet
over twisted pair, Broadcom’s new approach enables every
BroadR-Reach port to also support IEEE 802.3-compliant technologies
such as 10BASE-T and 100BASE-TX. As a result, BroadR-Reach
guarantees interoperability and connectivity to standard
10/100BASE-TX devices, over distances up to 100 meters, while
extending 10/100 operations over one, two, or four pairs of UTP cable up
to 1000m, depending on the quality of the cable and number of pairs
used.
Additionally, BroadR-Reach technology works in Power over Ethernet
(PoE)-enabled platforms providing a new generation of IP services and
applications such as security camera surveillance.
BroadR-Reach technology addresses key issues that affect deployment
of IP services in today’s enterprise. For example, since many traditional
Broadcom
CableChecker™, and BroadR-Reach™ are among the trademarks of Broadcom Corporation and/or its
affiliates in the United States, certain other countries and/or the EU. Any other trademarks or trade names
mentioned are the property of their respective owners.
BROADCOM CORPORATION
5300 California Avenue
Irvine, California 92617
© 2009 by BROADCOM CORPORATION. All rights reserved.
54881-PB00-R
®
, the pulse logo, Connecting everything
09/30/09
CLKSEL_125
TRD[3:0]{8}+
TRD[3:0]{7}+
TRD[3:0]{6}+
TRD[3:0]{5}+
TRD[3:0]{4}+
TRD[3:0]{3}+
TRD[3:0]{2}+
TRD[3:0]{1}+
REFCLK[1]+
REFCLK[2]+
S_REFCLK
RDAC[2:1]
CLKSEL[1]
CLKSEL[0]
®
CORRECTION
NEGOTIATION
BASELINE
BIAS GENERATOR
WANDER
Clock Generator
PGA
AUTO-
®
, the Connecting everything logo,
TX DAC
ADC
TIMING & PHASE
O V E R V I E W
CANCELLER
Block Diagram
RECOVERY
ECHO
FFE
digital PBX phone systems use twisted pair cables that will not support
standard IEEE 802.3 Ethernet PHY technology, BroadR-Reach would
be a good solution for migrating to IP-based telephony systems by
leveraging the current infrastructure. Also, in new installations, some
devices such as wireless access points (WAPs) and surveillance cameras
may not be conveniently located within the standard 100-meter range of
horizontal wiring in structured cabling systems. For these applications,
BroadR-Reach provides IT managers with additional flexibility in
connecting devices over distances that would otherwise require
fiber-optic cabling and expensive optical transceivers.
When in the BroadR-Reach mode of operation, the BCM54881 can
operate full duplex at the rate of 10 Mbps or 100 Mbps.
The BCM54881 also features advanced hardware-accelerated
CableChecker diagnostic software that detects cable length or cable plant
impairments. The information obtained from the diagnostic software can
be used in conjunction with the OEM software and has the intelligence
to automatically put the BCM54881 in either BroadR-Reach mode or
normal Ethernet mode of operation.
The BCM54881 architecture not only meets the requirements of
IEEE 802.3, IEEE 802.3u, and IEEE 802.3ab, but also maintains the
industry’s highest level of margin over IEEE requirements for echo,
near-end crosstalk (NEXT), and far-end crosstalk (FEXT).
Since BroadR-Reach ports also support standard 10/100BASE-TX
configurations, system vendors can easily offer upgraded products with
no compromise to the features, performance, or interoperability of their
existing switch technology.
MII REGISTERS
CANCELLER
DECODER
TRELLIS
XTALK
DFE &
S3MII
INTERFACE
CONTROL
MII MGMT
RESET
LED
S3MII_RX{8:1}
S3MII_TX{8:1}
LED2{8:1}/SLED[16:9]
LED3{8:1}/SLED[24:17]
LED4{8:1}/SLED[32:25]
SLED_CLK
SLED_STRB
SLED_IN
SLED_OUT
SL_CLK
SL_DO
SL_FRAME
SCL
SDA
MDIO[2:1]
MDC[2:1]
MODES
RESET
LED1{8:1}/SLED[8:1]
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com