BCM5481
®
10/100/1000BASE-T GIGABIT COPPER TRANSCEIVER
FEATURES
•
Fully integrated 10BASE-T/100BASE-TX/1000BASE-T Gigabit
Ethernet transceiver
•
GMII, RGMII, and MII MAC interface options
•
On-chip low-voltage regulators
•
Fully compliant with IEEE 802.3™, 802.3u, and 802.3ab standards
•
0.13µ CMOS—low power and cost
•
Low power
-
Less than 700 mW per port
-
Advanced power management
•
Trace matched output impedance
•
Line-side loopback
•
Low electromagnetic interference (EMI) emissions
•
Cable-plant diagnostics
-
Cable plant analyzer function detects cable plant impairments
-
Link quality indication LED
-
Automatic detection and correction of wiring pair swaps, pair
skew, and pair polarity
-
Automatic MDI/MDIX crossover at all speeds
•
Robust CESD tolerance
•
Support for jumbo packets up to 10 KB
•
IEEE 1149.1 (JTAG) boundary scan
•
64-pin MLP, 68-pin MLP, 100-pin FBGA, and 100-pin QFP
packages
SUMMARY OF BENEFITS
•
Simplifies system and board design.
-
Reduced I/O pin requirements with RGMII (over 50%).
-
On-chip RGMII timing delay
•
Provides interoperability with IEEE standard devices
operating at 10 Mbps, 100 Mbps, and 1000 Mbps at half- and
full-duplex.
•
Lowers system bill of materials (BOM) cost and simplifies
system design.
•
Requires no airflow or heatsink.
•
Eases system level debug.
•
Reduces system design constraints to meet EMI emissions
standards.
•
Cable diagnostic function characterizes cable plant condition
and immediately indicates cabling issues.
-
Prevents erroneous equipment return due to bad cable
plants.
-
Prevents manufacturing fall-out due to bad cable plants.
•
High CESD tolerance prevents equipment damage and
return.
•
Operates with larger packets for wider range of packet
protocol support and improved efficiency.
•
Ease of manufacturing with JTAG support, simplified power
supply, and multiple MAC interfaces.
Trans forme r
BCM5481
Transformer
Trans forme r
BCM5645
MAC
BCM5481
RJ-45
24F E +2G
S witch
BCM5481
BCM5248
Oc tal
10/100 Mbps P HY
BCM5248
Oc tal
10/100 Mbps P HY
BCM5248
Oc tal
10/100 Mbps P HY
General Gigabit Ethernet Connectivity
1000BASE-T Gigabit Uplink
R J -45
R J -45
OVERVIEW
TXD[7:0]
TXDAC
SYMBOL
ENCODER
8
TX_EN
TX_ER
GTX_CLK
TXC
TRD[0:3]±
BASELINE
WANDER
CORRECTION
ECHO
CANCELLER
XTALK
CANCELLER
x3
PGA
ADC
FFE
DFE/
TRELLIS
DECODER
AUTO-
NEGOTIATION
TIMING &
PHASE
RECOVERY
SYMBOL
DECODER/
ALIGNER
8
CLK125
COL
CRS
RXC
RX_DV
RX_ER
RXD[7:0]
ANEN (LED1)
XTALI
XTALO
RDAC
REGSUP[1:2]
REGSENSE[2]
REGBIAS
REG_OUT[1:2]
CLOCK
GENERATOR
BIAS
GENERATOR
MII
MGMT
CONTROL
LED
DRIVERS
FDX (LED2)
SPD0 (LED3)
F1000(LED4)
VOLTAGE
REGULATOR
MII
REGISTERS
MDC
MDIO
BCM5481 Reference Design
The BCM5481 is optimized for low power and small footprint size to
enable uplink and general Gigabit Ethernet connectivity applications. By
lowering system cost and reducing power dissipation, the BCM5481
enables a new class of cost-effective Gigabit Ethernet equipment,
driving the delivery of Gigabit bandwidth to the desktop.
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
BCM5481 architecture also meets the requirements of 802.3, 802.3u,
and 802.3ab, but maintains the industry’s highest level of margin over
IEEE requirements for Echo, NEXT, and FEXT. Low power is a key
factor in implementing Gigabit small form factor NICs and uplinks and,
at less than 700 mW per port, the BCM5481 has the industry's lowest
power. Also, the BCM5481 has extremely low EMI emissions, which
reduces the design constraints required to meet EMI emissions
specifications.
In addition to supporting the IEEE 802.3™ standard Gigabit Media
Independent Interface (GMII), the BCM5481 also supports the reduced
gigabit media independent interface (RGMII). RGMII is a reduced pin-
count (12 versus 25) version of the GMII. The small package, multiple
MAC interfaces, and streamlined power supply lowers system cost and
simplifies the system and board level design.
This device is another member of Broadcom's 0.13µ Gigabit copper
PHY family, joining the BCM5461, BCM5461S, BCM5464,
BCM5464S, BCM5482, BCM5482S, BCM5488, and BCM5488S. The
0.13 µm process is the optimal process that offers the best performance,
lowest cost, and lowest power for Gigabit copper solutions. Further,
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.
The BCM5481 incorporates a number of advanced features. The link
quality indicator LED provides installers with immediate visual
notification of any problems with the wiring plant supporting operation
at the desired speed. This includes physical wiring defects that the
BCM5481 cannot automatically correct and channel conditions such as
excessive cable length and return loss, crosstalk, echo, and noise.
Broadcom’s cable analyzer software can be used with the device to
provide remote management of the cable and first-level diagnostics and
fault isolation.
The BCM5481 also has ESD tolerance that exceeds typical industry
standards. This prevents ESD damage not only during manufacturing but
also during cable-sourced electrostatic discharge (CESD) events in the
field. CESD is an ESD event that occurs when an electrically charged
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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