BCM5424 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – QUAD-PORT GIGABIT COPPER TRANSCEIVER

BCM5424 OVERVIEW
BCM5424 Block Diagram
TRD [3:0]+ {1:4}*
XTALI
XTALO
RDAC {2:1}
TX DAC
18
Baseline
Wander
Correction
PGA
ADC
Auto-
Negotiation
Clock
Generator
Bias
Generator
Symbol
Encoder
MUX
16
4
4
Echo
Canceller
XTALK
Canceller
X3
Symbol
FFE
DFE/
Trellis
Decoder
Decoder/
Aligner
4
4
16
Timing &
Phase
Recovery
MII
Registers
MII
MGMT
Control
*{1:4} Refers to the four separate Gigabit transceivers in the BCM5424
TXD[3:0]{4:1}
TX_EN ^{4:1}
GTX_CLK {1:4}
RXC ^{4:1}
RX_DV{4:1}
RXD[3:0]{4:1}
MDC
MDIO
INTR{1:4}*
Modes
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.
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.
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.
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.
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 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.
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16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5424-PB01-R 06.25.03
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