BCM54980
®
OCTAL-PORT 10/100/1000BASE-T GIGABIT ETHERNET TRANSCEIVER
SUMMARY OF BENEFITS
FEATURES
• Eight 10BASE-T/100BASE-TX/1000BASE-T Gigabit
Ethernet (GbE) transceivers in a single fully integrated 90-nm
CMOS chip
• Energy efficient, low-cost, and low-power octal-port
integration enables single-row, high-port density switches
• Ability to reverse MDI, easing board design and simplifying
• Reverse MDI capability
layout in high port density switch designs
• Low power: 500 mW per port
• Low-cost solution for unmanaged switch applications
• SGMII and SerDes MAC interface options
• Lowers system BOM cost and simplifies system design
• Internal 100Ω twisted-pair termination resistors
• Internal 100Ω twisted-pair termination resistors eliminate
• Supports 10/100/1000BASE-T and 100BASE-FX on copper
interface
need for external resistors, saving eight resistors per port
• Provides compatibility with IEEE standard devices operating
at 10 Mbps, 100 Mbps, and 1000 Mbps at half-duplex and fullduplex
• Enhanced LED driver modes
• Fully compliant with IEEE 802.3, IEEE 802.3u, and
IEEE 802.3ab standards
• Eases system-level debug
• Enables use of low-cost magnetics, even in high-density (48+)
• Line-side loopback
designs
• Low EMI emissions
• CableChecker characterizes cable plant condition and
immediately indicates cabling issues
- CableChecker detection of cable plant impairments
- Prevents erroneous equipment return due to bad cable
plants
- Prevents manufacturing fallout due to bad cable plants
• Hardware-accelerated CableChecker™ diagnostics
• Robust cable-sourced electrostatic discharge (CESD)
tolerance
• Support for jumbo packets
• IEEE 1149.1 (JTAG) and 1149.6 (AC-JTAG) boundary scan
• Ethernet@Wirespeed™ and Super-Isolate mode support
• Operates with larger packets for wider range of packetprotocol support and improved efficiency
• Ease of manufacturing with JTAG support, simplified power
supply, and multiple MAC interfaces
BCM54980
10/100/1000BASE-T
Gigabit Ethernet
Transceiver
2x8 RJ-45s
BCM54980
with integrated magnetics
10/100/1000 Mbps
Ethernet Switch
BCM54980 System Diagram
OVERVIEW
BCM54980
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
MII
MGMT
Control
MII
Registers
RDAC [2:1]
MDIO [2:1]
MDC [2:1]
Modes
Bias
Generator
Clock
Generator
REFCLK2+
REFCLK1+
BCM54980 Reference Design
The BCM54980 comprises eight complete 10/100/1000BASE-T GbE
transceivers integrated on a single monolithic CMOS chip. The BCM54980
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 15 percent compared to previous generation PHY
products, the BCM54980 enables a new class of cost-effective GbE
equipment, driving the delivery of GbE bandwidth to the desktop.
The BCM54980 DSP-based architecture and advanced power management
techniques combine with enhanced analog front-end design to achieve
robust and low-power operation over existing Category 5 twisted-pair
wiring. The BCM54980 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, nearend crosstalk (NEXT), and far-end crosstalk (FEXT). Low power is the key
to implementing high-density GbE switches, and the BCM54980 has the
smallest footprint and lowest power in the industry at less than 500 mW per
port. In addition, the BCM54980 has extremely low EMI emissions, which
reduces the design constraints required to meet EMI radiation
specifications. The BCM54980 provides the highest level of external
component integration in the smallest possible package, resulting in a PBC
space savings of 40% for high-density switch applications.
The BCM54980 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.
This new device is the first member of Broadcom’s 90-nm GbE copper
PHY family, joining more than a dozen previous-generation quad and
single products. The 90-nm process is the optimal process that offers the
best performance, lowest cost, and lowest power for highly-integrated GbE
copper solutions. Devices based on the 90-nm process offer an excellent
long-term cost curve, enabling better cost reduction over time (compared
to older technologies) without needing to redesign or requalify a new part.
Each BCM54980 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 is a problem with the wiring plant supporting operation
at the preferred speed, including physical wiring defects that the
BCM54980 cannot automatically correct as well as channel conditions
such as excessive cable length and return loss, crosstalk, echo, and noise.
Broadcom’s CableChecker software can be used with this device to provide
remote management of the cable and a first level of diagnostics and fault
isolation.
The BCM54980 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 BCM54980 leads the industry in
tolerance level.
Broadcom®, the pulse logo, Connecting everything®, the Connecting everything logo, and
CableChecker™ 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.
54980-PB201-R
04/30/07
Phone: 949-926-5000
Fax: 949-926-5203
E-mail: [email protected]
Web: www.broadcom.com