BCM5424
PRODUCT
Brief
®
QUAD-PORT GIGABIT COPPER TRANSCEIVER WITH RGMII AND RTBI INTERFACE
B C M 5 4 2 4
S U M M A R Y
F E AT U R E S
O F
B E N E F I T S
Four fully integrated 10BASE-T/100BASE-TX/
• 1000BASE-T
Gigabit Ethernet transceivers
RGMII
and
RTBI
interface options
•
Fully compliant with IEEE 802.3, 802.3u, and 802.3ab
• standards
• 0.13 um CMOS — low power and cost
• Low power
Low power quad-port integration enables single-row,
• high
port density switches.
• Low EMI emissions
logic automatically selects the
• Ethernet@WireSpeed
maximum speed based on channel conditions
• Cable plant diagnostic
• Requires no airflow or heatsink.
Reduces design constraints in high-density
• applications
that have higher EMI emissions.
Automatically
the link to support the
• highest possibleconfigures
speed based on link partner capability
• 1W per port
• Advanced power management
TM
• 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 9 KB
• IEEE 1149.1 (JTAG) boundary scan
• Lowers system costs by eliminating PCB layers required for
routing high density solutions
• 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 to the PHY.
Provides compatibility with IEEE standard devices
• operating
at 10, 100, and 1000 Mbps at half- and fullduplex.
and characteristics of the channel.
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.
Supports jumbo packets for wider range of packet
• protocol
compatibility.
Ease of manufacturing with JTAG support, simplified
• power
supply, and multiple MAC interfaces.
BCM5424
BCM5424
10/100/1000BASE-T
Gigabit Ethernet Transceiver
2x8 RJ-45s
BCM5424
Ethernet Switch
10/100/1000 Mbps
BCM5424
with integrated magnetics
BCM5424 System Diagram
B C M 5 4 2 4
O V E R V I E W
BCM5424 Block Diagram
18
Baseline
Wander
Correction
TRD [3:0]+ {1:4}*
Symbol
Encoder
TX DAC
Echo
Canceller
XTALK
Canceller
X3
FFE
DFE/
Trellis
Decoder
MUX
16
4
TXD[3:0]{4:1}
TX_EN {4:1}
4
GTX_CLK {1:4}
4
4
RXC {4:1}
RX_DV{4:1}
RXD[3:0] {4:1}
Symbol
PGA
ADC
Decoder/
Aligner
16
AutoNegotiation
XTALI
Timing &
Phase
Recovery
Clock
Generator
XTALO
Bias
Generator
RDAC {2:1}
MII
Registers
MII
MGMT
Control
MDC
MDIO
INTR{1:4}*
Modes
*{1:4} Refers to the four separate Gigabit transceivers in the BCM5424
The BCM5424 consists of four complete 10/100/1000BASE-T Gigabit
Ethernet transceivers integrated on a single monolithic CMOS chip. The
BCM5424 is optimized for low power and small footprint size to enable
high port-density applications. By doubling transceiver port density,
lowering system cost, and reducing power dissipation by nearly 50%,
the BCM5424 enables a new class of cost-effective Gigabit Ethernet
equipment, driving the delivery of Gigabit bandwidth to the desktop.
This device is another member of Broadcom's 0.13u Gigabit copper
PHY family, joining the BCM5404, BCM5421, BCM5421S and
BCM5434. The 0.13u process is an aggressive process that offers the
best performance, lowest cost, and lowest power for Gigabit copper
solutions. In addition, devices based on this process offer an excellent
long-term cost curve, enabling cost reductions as the price of the 0.13m
wafers come down, without having to redesign or requalify a new part.
The BCM5424’s 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
BCM5424 architecture not only 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 key to implementing high-density Gigabit switches, and at 1W
per port, the BCM5424 enables twice the density of previous Gigabit
PHY transceivers. In addition, the BCM5424 has extremely low EMI
emissions, which reduces the design constraints required to meet EMI
radiation specifications.
Each port of the BCM5424 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 desired speed. This includes physical wiring
defects that the BCM5424 cannot automatically correct for 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 a first level of
diagnostics and fault isolation. The BCM5424 is fully compatible with the
IEEE 802.3 standard for auto-negotiation of speed, but additionally
supports Ethernet@WireSpeed™. Ethernet@WireSpeed™ allows the
BCM5424 to force auto-negotiation to be automatically limited by the
speed that the channel can reliably support, rather than the performance of
the end equipment.
The BCM5424 supports the RGMII and RTBI interfaces. The RGMII
is a reduced pin-count (12 versus 25) version of the GMII and RTBI is
a reduced pin-count version of TBI utilizing standard ASIC
technology. 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/switch cost by enabling smaller die sizes than
would be possible with full GMII or TBI interfaces.
The BCM5424 also has ESD tolerance well above typical industry
standards. This prevents ESD damage not only during manufacturing
but during CESD events in the field. Cable-sourced electrostatic
discharge (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 recent cable installations.
Broadcom®, the pulse logo, and Connecting everything® are trademarks of Broadcom Corporation and/or its
subsidiaries in the United States and certain other countries. All other trademarks are the property of their
respective owners.
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5424-PB01-R 06.25.03
Phone: 949-450-8700
FAX: 949-450-8710
Email: [email protected]
Web: www.broadcom.com