BCM5481 查看數據表（PDF） - Broadcom Corporation
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BCM5481 Datasheet PDF : 2 Pages
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OVERVIEW
8
TRD[0:3]±
TXDAC
BASELINE
WANDER
CORRECTION
ECHO
CANCELLER
XTALK
CANCELLER
x3
SYMBOL
ENCODER
TXD[7:0]
TX_EN
TX_ER
GTX_CLK
TXC
XTALI
XTALO
RDAC
REGSUP[1:2]
REGSENSE[2]
REGBIAS
REG_OUT[1:2]
PGA
ADC
AUTO-
NEGOTIATION
CLOCK
GENERATOR
BIAS
GENERATOR
VOLTAGE
REGULATOR
FFE
MII
REGISTERS
DFE/
TRELLIS
DECODER
TIMING &
PHASE
RECOVERY
MII
MGMT
CONTROL
SYMBOL
DECODER/
ALIGNER
8
LED
DRIVERS
CLK125
COL
CRS
RXC
RX_DV
RX_ER
RXD[7:0]
ANEN (LED1)
FDX (LED2)
SPD0 (LED3)
F1000(LED4)
MDC
MDIO
BCM5481 Reference Design
The BCM5481 is optimized for low power and small footprint size to
This device is another member of Broadcom's 0.13µ Gigabit copper
enable uplink and general Gigabit Ethernet connectivity applications. By
lowering system cost and reducing power dissipation, the BCM5481
PHY family, joining the BCM5461, BCM5461S, BCM5464,
BCM5464S, BCM5482, BCM5482S, BCM5488, and BCM5488S. The
enables a new class of cost-effective Gigabit Ethernet equipment,
driving the delivery of Gigabit bandwidth to the desktop.
0.13 µm process is the optimal process that offers the best performance,
lowest cost, and lowest power for Gigabit copper solutions. Further,
The BCM5481 digital signal processor-based architecture and advanced
power management techniques combine to achieve robust and low
power operation over the existing CAT-5 twisted-pair wiring. The
devices based on the 0.13µ process offer an excellent long-term cost
curve, enabling better cost reduction over time, compared to older
technologies, without having to redesign or requalify a new part.
BCM5481 architecture also meets the requirements of 802.3, 802.3u,
The BCM5481 incorporates a number of advanced features. The link
and 802.3ab, but maintains the industry’s highest level of margin over
quality indicator LED provides installers with immediate visual
IEEE requirements for Echo, NEXT, and FEXT. Low power is a key
notification of any problems with the wiring plant supporting operation
factor in implementing Gigabit small form factor NICs and uplinks and,
at the desired speed. This includes physical wiring defects that the
at less than 700 mW per port, the BCM5481 has the industry's lowest
BCM5481 cannot automatically correct and channel conditions such as
power. Also, the BCM5481 has extremely low EMI emissions, which
reduces the design constraints required to meet EMI emissions
excessive cable length and return loss, crosstalk, echo, and noise.
Broadcom’s cable analyzer software can be used with the device to
specifications.
In addition to supporting the IEEE 802.3™ standard Gigabit Media
Independent Interface (GMII), the BCM5481 also supports the reduced
provide remote management of the cable and first-level diagnostics and
fault isolation.
The BCM5481 also has ESD tolerance that exceeds typical industry
gigabit media independent interface (RGMII). RGMII is a reduced pin-
count (12 versus 25) version of the GMII. The small package, multiple
standards. This prevents ESD damage not only during manufacturing but
also during cable-sourced electrostatic discharge (CESD) events in the
MAC interfaces, and streamlined power supply lowers system cost and
field. CESD is an ESD event that occurs when an electrically charged
simplifies the system and board level design.
network cable is plugged into a network port, an issue becoming more
prevalent with contemporary cable installations.
Broadcom®, the pulse logo, Connecting everything®, and the Connecting everything logo 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
© 2007 by BROADCOM CORPORATION. All rights reserved.
5481-PB00-R
04/03/07
Phone: 949-926-5000
Fax: 949-926-5203
E-mail: info@broadcom.com
Web: www.broadcom.com
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