BCM5421SA2KPF Datasheet, PDF (2/2 Pages) Broadcom Corporation. – 10/100/1000BASE-T GIGABIT COPPER TRANSCEIVER WITH SERDES

OVERVIEW
TX DAC
8
TRD [3:0]+
XTALI
XTALO
RDAC
Gain
Automatic
Control
PGA
ADC
Auto-
Negotiation
Clock
Generator
Bias
Generator
Echo
Canceller
FFE
XTALK
Canceller
X3
DFE/
Trellis
Decoder
Timing &
Phase
Recovery
Symbol
Encoder
MUX
SERDES/
SGSMII
Symbol
Decoder/
Aligner
LED
Drivers
MII
Registers
MII
MGMT
Control
TXD[7:0]
TX_EN
TX_ER
GTX_CLK
TX_CLK
SGIN±
SCLK±
SGOUT±
COL
CRS
RX_CLK
RX_DV
RX_ER
8
RXD[7:0]
Link[2]
Link[1]
RCVLED
XMTLED
FDXLED
MDC
MDIO
INTR
Modes
The BCM5421S is a fully integrated 10/100/1000BASE-T Gigabit
Ethernet transceiver. The BCM5421S is optimized for low power and
small footprint size to enable GBIC, copper, and fiber applications. By
lowering system cost and reducing power dissipation by nearly 50%, the
BCM5421S enables a new class of cost-effective Gigabit Ethernet
equipment.
The BCM5421S’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
BCM5421S 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 a
key factor in implementing Gigabit small form factor GBICs and uplinks
and, at 1W per port, the BCM5421S dissipates nearly half the power of
previous Gigabit PHY transceivers. In addition, the BCM5421S has
extremely low EMI emissions, which reduces the design constraints
required to meet EMI emissions specifications.
In addition to supporting IEEE 802.3 Standard Gigabit Media
Independent Interface (GMII), and industry standard Ten Bit Interface
(TBI), the BCM5421S also supports the RGMII and RTBI, serial
SerDes, and SGMII interfaces. The serial SerDes and SGMII are reduced
pin-count (4 and 6 respectively, versus 25) Switch/MAC interfaces. In
addition, the serial SerDes interface can be used to route from SerDes to
copper as in GBIC applications. 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 high-density package,
multiple MAC interfaces, and streamlined power supply lowers system
cost and simplifies the system and board level design.
This device represents the fourth generation of Gigabit Ethernet
transceivers based on the same field-proven architecture as in the
BCM5400, BCM5401, BCM5411, and BCM5402 transceivers. The
fourth generation Gigabit PHY core has already been deployed in the
BCM5404, a quad port 10/100/1000BASE-T device of which the
BCM5421S is a single port slice.
The BCM5421S 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 BCM5421S
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 BCM5421S is fully compatible with the IEEE
802.3 standard for auto-negotiation of speed, but additionally supports
Ethernet@WireSpeed™. Ethernet@WireSpeed allows the BCM5421S
to force auto-negotiation to automatically establish link at speeds that the
channel can reliably support, preventing failure to link due to standard
IEEE auto-negotiation.
The BCM5421S 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, Ethernet@WireSpeed™, and Connecting everything^® are trademarks of
Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. All other
trademarks mentioned are the property of their respective owners.
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2004 by BROADCOM CORPORATION. All rights reserved.
5421S-PB00-R 07/09/04
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com