BCM5488S
®
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
• Low-power, octal-port integration enables single-row, highport density switches.
- Lowers system costs by eliminating PCB layers required for
routing high-density solutions.
- Reduced I/O pin requirements with SGMII (over 75%) and
SerDes (over 80%).
- Lowers MAC/switch costs by reducing the number of pins
required to interface with the PHY.
• SGMII and SerDes MAC interface options
• Ethernet@Wirespeed™ and super isolate mode support
• Fully compliant with IEEE 802.3, IEEE 802.3u, and
IEEE 802.3ab standards
• 0.13-micron CMOS—low power and cost
• Provides compatibility with IEEE standard devices operating at
10 Mbps, 100 Mbps, and 1000 Mbps at half-duplex and fullduplex.
• Supports line side copper or 100BASE-FX fiber mode
• Low power
• Lowers system BOM cost and simplifies system design.
- <625 mW per port
- Advanced power management
• Eases system level debug.
• Trace-matched output impedance
• Enables use of low-cost magnetics, even in high-density (48+)
designs.
• Line-side loopback
• CableChecker characterizes cable plant condition and
• Low EMI emissions
immediately indicates cabling issues.
- Prevents erroneous equipment return due to bad cable
plants.
- Prevents manufacturing fallout due to bad cable plants.
• 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
• 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.
IEEE 1149.1 (JTAG) and 1149.6 (AC-JTAG) boundary scan
• Package: 484-pin PBGA
BCM5488S System Diagram
10/100/1000
Mbps
Ethernet
Switch
BCM5488S
10/100/1000BASE-T
Mbps Ethernet
Switch
2x8
RJ-45s
with
Integrated
Magnetics
BCM5488S
10/100/1000BASE-T
Mbps Ethernet
Switch
OVERVIEW
BCM5488S
TX DAC
TRD [3:0] {8}±
TRD [3:0] {7}±
TRD [3:0] {6}±
TRD [3:0] {5}±
XTALK
Canceller
Baseline
Wander
Correction
SGMII
Interface
SGIN {8:1}±
SGOUT {8:1}±
SCLK {8:1}±
TRD [3:0] {4}±
Echo
Canceller
TRD [3:0] {3}±
TRD [3:0] {2}±
DFE/
Trellis
Decoder
TRD [3:0] {1}±
FFE
PGA
ADC
Timing &
Phase
Recovery
LED
Interface
LED[4:1] {8:1}/
SLED[32:1]
SLED_CLK
SLED_STRB
SLED_IN
AutoNegotiation
REGSUP[2:1]
REGCNTL [2:1]
Voltage
Regulator
MII
MGMT
Control
MII
Registers
REGSENV [2:1]
RDAC [2:1]
MDIO [2:1]
MDC [2:1]
Modes
Bias
Generator
Clock
Generator
REFCLK2+
REFCLK1+
BCM5488S Reference Design
The BCM5488S consists of eight complete 10/100/1000BASE-T Gigabit
Ethernet transceivers integrated on a single monolithic CMOS chip. The
BCM5488S 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 BCM5488S enables a new class
of cost-effective Gigabit Ethernet equipment, driving the delivery of
Gigabit Ethernet bandwidth to the desktop.
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.
The BCM5488S DSP-based architecture and advanced power management
techniques combine to achieve robust and low-power operation over
existing Category 5 twisted-pair wiring. The BCM5488S 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 BCM5488S has the lowest power in the industry
at less than 625 mW per port. In addition, the BCM5488S has extremely
low EMI emissions, which reduces the design constraints required to meet
EMI radiation specifications.
Each BCM5488S 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 BCM5488S 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 BCM5488S supports the SGMII and SerDes MAC interfaces. The
SGMII and serial SerDes interfaces are reduced pin-count (6 and 4,
respectively, versus 25) versions of the GMII. 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/
switch cost by enabling smaller die sizes than would be possible with full
GMII.
The BCM5488S 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 BCM5488S can tolerate well
over 3kV of CESD.
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
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2006 by BROADCOM CORPORATION. All rights reserved.
5488S-PB01-R
04/10/06
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: [email protected]
Web: www.broadcom.com