BCM5421 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – 10/100/1000 BASE-T GIGABIT COPPER TRANSCEIVER

BCM5421 OVERVIEW
BCM5421 Block Diagram
TRD [3:0]+ {1:4}*
XTALI
XTALO
RDAC{1:2}*
16
TX DAC
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
Symbol
Decoder/
Aligner
MII
Registers
MII
MGMT
Control
TXD[7:0]
TX_EN {1:4}*
TX_ER {1:4}*
GTX_CLK {1:4}*
TX_CLK {1:4}*
COL {1:4}*
CRS {1:4}*
RX_CLK {1:4}*
RX_DV {1:4}*
RX_ER {1:4}*
RXD[7:0] {1:4}*
MDC
MDIO
INTR{1:4}*
Modes
*{1:4} Refers to the four separate Gigabit transceivers in the BCM5404
The BCM5421 is a fully integrated 10/100/1000BASE-T
Gigabit Ethernet transceiver. The BCM5421 is optimized for low
power and small footprint size to enable Network Interface Card
(NIC) and uplink applications. By lowering system cost and
reducing power dissipation by nearly 50%, the BCM5421
enables a new class of cost-effective Gigabit Ethernet equipment,
driving the delivery of Gigabit bandwidth to the desktop.
The BCM5421’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 BCM5421 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 NICs and uplinks and, at
1W per port, the BCM5421 dissipates nearly half the power of
previous Gigabit PHY transceivers. For NIC applications, support
for Wake on LAN enables compliance with PCI 2.2 and
PC99/PC2000. In addition, the BCM5421 has extremely low EMI
emissions, which reduces the design constraints required to meet
EMI emissions specifications.
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 BCM5421 is a single-port slice.
The BCM5421 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 BCM5421 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
BCM5421 is fully compatible with the IEEE 802.3 standard for
auto-negotiation of speed, but additionally supports
Ethernet@WireSpeed™. Ethernet@WireSpeed™ allows the
BCM5421 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 at higher
speeds over impaired cable plants.
The BCM5421 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.
In addition to supporting the IEEE 802.3 Standard Gigabit Media
Independent Interface (GMII), and the industry-standard Ten Bit
Interface (TBI), the BCM5421 also supports the RGMII and
RTBI interfaces. 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.
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®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5421-PB04-R-6.13.03
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