BCM5488
®
OCTAL-PORT 10/100/1000BASE-T GIGABIT ETHERNET TRANSCEIVER
SUMMARY OF BENEFITS
FEATURES
• Eight fully integrated 10BASE-T/100BASE-TX/1000BASE-T
Gigabit Ethernet transceivers
• RGMII, SGMII, and SerDes MAC interface options
• 1-Gbps lineside SerDes with RGMII MAC interface option
• Fully compliant with IEEE 802.3, IEEE 802.3u, and
IEEE 802.3ab standards
• 0.13-micron CMOS—low power and cost
• Supports copper or fiber in RGMII mode
• Low power
• <625 mW per port
• Advanced power management
• Trace-matched output impedance
• Lineside loopback
high-port density switches
• Lowers system costs by eliminating PCB layers required for
routing high-density solutions
• Reduced I/O pin requirements with RGMII (over 50%), SGMII
(over 75%), and SerDes (over 80%)
• Clock timing can be adjusted to eliminate board trace delays
required by the RGMII specification
• Lowers MAC/switch costs by reducing the number of pins
required to interface with the PHY
• Provides compatibility with IEEE standard devices operating
at 10, 100, and 1000 Mbps at half-duplex and full-duplex
• Lowers system BOM cost and simplifies system design
• Eases system level debug
• Enables use of low-cost magnetics, even in high-density (48+)
• Low EMI emissions
• CableChecker™ diagnostics
•
• CableChecker detection of 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 cable-sourced electrostatic discharge (CESD) tolerance
• Support for jumbo packets up to 10 KB
• IEEE 1149.1 (JTAG) boundary scan
• Package: 484-pin PBGA
• Low-power, octal-port integration enables single-row,
•
•
•
designs
CableChecker characterizes cable plant condition and
immediately indicates cabling issues
• Prevents erroneous equipment return due to bad cable plants
• Prevents manufacturing fallout due to bad cable plants
Over 3 kV of 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
BCM5488
10/100/1000BASE-T
Gigabit Ethernet
Transceiver
2x8 RJ-45s
BCM5488
with integrated magnetics
10/100/1000 Mbps
Ethernet Switch
BCM5488 System Diagram
OVERVIEW
SGIN{8: 1}+
TX DAC
Crosstalk
Canceler
TRD{8} [4:1]+
TRD{7} [4:1]+
Baseline
W ander
Correction
TRD{6} [4:1]+
TRD{5} [4:1]+
TRD{4} [4:1]+
DFE and
Trellis
Decoder
FFE
PGA
TRD{1} [4:1]+
Auto -negotiation
SCLK {8:1}+
SGOUT {8:1}+
Echo Canceler
TRD{3} [4:1]+
TRD{2} [4:1]+
SGMII
ADC
LED [1] {8:1}
LED Interface
Tim ing and Phase
Recovery
LED[ 2]{8: 1}
LED[ 3]{8: 1}
LED[ 4]{8: 1}
MDC[1]
REFCLK[1]
Clock Generator
REFCLK[2]
RDAC[1]
MII Registers
RESET
PHYAD[ 4:0]
Reset
The BCM5488 consists of eight complete 10/100/1000BASE-T Gigabit
Ethernet transceivers integrated on a single monolithic CMOS chip. The
BCM5488 is optimized for low power and small footprint size to enable
high-port density applications. By lowering system cost and reducing
power dissipation by nearly 30 percent, the BCM5488 enables a new
class of cost-effective Gigabit Ethernet equipment, driving the delivery
of Gigabit Ethernet bandwidth to the desktop.
The BCM5488 DSP-based architecture and advanced power
management techniques combine to achieve robust and low-power
operation over existing Category 5 twisted-pair wiring. The BCM5488
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). Low power is the key
to implementing high-density Gigabit Ethernet switches, and the
BCM5488 has the lowest power in the industry at less than 625 mW per
port. In addition, the BCM5488 has extremely low EMI emissions,
which reduces the design constraints required to meet EMI radiation
specifications.
The BCM5488 supports the RGMII, SGMII, and SerDes MAC
interfaces. The RGMII, SGMII, and serial SerDes interfaces are reducedpin-count (12, 6, and 4, respectively, versus 25) versions of the GMII.
The RGMII clock timing can be adjusted to eliminate the board trace
delays required by the RGMII specification. These reduced-pin-count
interfaces simplify design and lower system cost by reducing the number
of layers required to route high-density solutions. In addition, these
interfaces allow fewer pins at the MAC/switch, which reduces the MAC/
MDC[2]
MDIO[2]
MDIO_SEL
Bias Generator
RDAC[2]
MDIO[ 1]
M II
Managem ent
Control
INTF_SEL[3:0]
switch cost by enabling smaller die sizes than would be possible with full
GMII.
This device is another member of Broadcom’s 0.13-µm Gigabit Ethernet
copper PHY family, joining more than a dozen other quad and single
products. The 0.13-µm process is the optimal process that offers the best
performance, lowest cost, and lowest power for Gigabit Ethernet copper
solutions. Devices based on the 0.13-µm process offer an excellent longterm cost curve, enabling better cost reduction over time (compared to
older technologies) without having to redesign or requalify a new part.
Each BCM5488 port is fully independent and has individual interface,
control, and status registers, and incorporates a number of advanced
features. A link-quality indicator LED gives installers an instant visual
indication if there are any problems with the wiring plant supporting
operation at the preferred speed. This includes physical wiring defects
that the BCM5488 cannot automatically correct for and channel
conditions such as excessive cable length and return loss, crosstalk, echo,
and noise. Broadcom’s CableChecker software can be used with the
device to provide remote management of the cable and a first level of
diagnostics and fault isolation.
The BCM5488 has the industry's highest tolerance to electrostatic
discharge (ESD). This prevents ESD damage not only during
manufacturing but also during CESD events in the field. CESD is an
ESD event that occurs when an electrically charged network cable is
plugged into a network port. This is an issue that has become more
prevalent with contemporary cable installations, and the BCM5488 can
tolerate well over 3kV of CESD.
Broadcom®, the pulse logo, QuadSquad™, 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
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2005 by BROADCOM CORPORATION. All rights reserved.
5488-PB00-R
04/15/05
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: [email protected]
Web: www.broadcom.com