BCM5434 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – 4-PORT GIGABIT COPPER TRANSCEIVER

BCM5434 OVERVIEW
BCM5434 Block Diagram
TRD [3:0]+ {1:4}*
XTALI
XTALO
RDAC {2:1}
TX DAC
16
Baseline
Wander
Correction
PGA
ADC
Auto-
Negotiation
Clock
Generator
Bias
Generator
Echo
Canceller
FFE
XTALK
Canceller
X3
DFE/
Trellis
Decoder
Timing &
Phase
Recovery
Symbol
Encoder
MUX
SerDes/
SGMI
Symbol
Decoder/
Aligner
MII
Registers
MII
MGMT
Control
*{1:4} Refers to the four separate Gigabit transceivers in the BCM5434
SGIN+
SCLK+
SGOUT+
MDC
MDIO
INTR{1:4}*
MODES
The BCM5434 consists of four complete 10/100/1000BASE-T Gigabit
Ethernet transceivers integrated on a single monolithic CMOS chip. The
BCM5434 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 BCM5434 enables a new class of cost-effective Gigabit Ethernet
equipment, driving the delivery of Gigabit bandwidth to the desktop.
The BCM5434’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
BCM5434 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 BCM5434 enables twice the density of previous Gigabit
PHY transceivers. In addition, the BCM5434 has extremely low EMI
emissions, which reduces the design constraints required to meet EMI
radiation specifications.
The BCM5434 supports SGMII and Serdes MAC interfaces. The
serial SerDes and SGMII are reduced pin-count (4 and 6 respectively)
Switch/MAC interfaces. 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 represents the fourth member of Broadcom's 0.13u Gigabit
copper PHY family, joining the BCM5404, BCM5421, and BCM5421S.
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 0.13u
wafers come down, without having to redesign or requalify a new part.
Each port of the BCM5434 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 BCM5434 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 BCM5434 is fully compatible with the
IEEE 802.3 standard for auto-negotiation of speed, but additionally
supports Ethernet@WireSpeed™. Ethernet@WireSpeed™ allows the
BCM5434 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 BCM5434 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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BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5434-PB01-R 06.25.03
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