bcm5478 Broadcom Corp., bcm5478 Datasheet - Page 2

• Manufacturer Part Number: bcm5478
• Description: Octal-port 10/100/1000base-t Gigabit Ethernet Transceiver
• Manufacturer: Broadcom Corp.

The BCM5478 consists of eight complete 10/100/1000BASE-T Gigabit
Ethernet transceivers integrated on a single monolithic CMOS chip. The
BCM5478 is optimized for low power and small footprint size to enable
high-port-density applications. The BCM5478 enables a new class of
cost-effective Gigabit Ethernet equipment by lowering system cost and
reducing power dissipation by nearly 30 percent, driving the delivery of
Gigabit Ethernet bandwidth to the desktop.
The BCM5478 DSP-based architecture and advanced power
management techniques combine to achieve robust and low-power
operation over existing Category 5 twisted-pair wiring. The BCM5478
architecture not only meets the requirements of IEEE 802.3,
IEEE 802.3u, and IEEE 802.3ab, but also maintains the industry’s
highest level of margin over IEEE requirements for echo, near-end
crosstalk (NEXT), and far-end crosstalk (FEXT). Low power is the key
to implementing high-density Gigabit Ethernet switches, and the
BCM5478 has the lowest power in the industry at less than 600 mW per
port. In addition, the BCM5478 has extremely low EMI emissions,
which reduces the design constraints required to meet EMI radiation
specifications.
The BCM5478 supports the RGMII, SGMII, and SerDes MAC
interfaces. The RGMII, SGMII, and serial SerDes interfaces are reduced-
pin-count (12, 6, and 4, respectively, versus 25) versions of the GMII.
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/
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.
5478-PB00-R
®
, the pulse logo, QuadSquad™, and Connecting everything
10/11/04
TRD [0:3] ± {1:8}*
RDAC
XTALO
XTALI
{1:2}*
®
PGA
Negotiation
Generator
Generator
Clock
Auto-
Bias
16
*{1:8} Refers to the 8 separate Gigabit Ethernet transceivers in the BCM5478
Automatic
Control
Gain
TX DAC
ADC
®
are trademarks of Broadcom
O V E R V I E W
Canceler
Echo
FFE
Registers
MII
switch cost by enabling smaller die sizes than would be possible with full
GMII.
This device is another member of Broadcom’s 0.13-µm Gigabit Ethernet
copper PHY family, joining more than a dozen other quad and single
products. The 0.13-µm process is the optimal process that offers the best
performance, lowest cost, and lowest power for Gigabit Ethernet copper
solutions. Devices based on the 0.13-µm process offer an excellent long-
term cost curve, enabling better cost reduction over time (compared to
older technologies) without having to redesign or requalify a new part.
Each BCM5478 port 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 preferred speed. This includes physical wiring defects
that the BCM5478 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 BCM5478 has the industry's highest tolerance to ESD. This
prevents ESD damage not only during manufacturing, but also during
CESD events in the field. CESD is an ESD event that occurs when an
electrically charged network cable is plugged into a network port. This is
an issue that has become more prevalent with contemporary cable
installations, and the BCM5478 can tolerate well over 2kV of CESD.
Crosstalk
Canceler
Decoder
Timing &
Recovery
Trellis
Phase
DFE/
X3
Control
MGMT
MII
Decoder/
Encoder
Symbol
Symbol
Aligner
Multiplexer
Multiplexer
SerDes/
SGMII
16
16
2
2
2
2
2
2
2
2
TXD[3:0]
TX_ER
TX_CLK
COL
RX_ER
MDIO
MDC
TX_EN
CRS
RX_CLK
RX_DV
MODES
GTX_CLK
RXD[3:0]
NTR
Phone: [phone]
Fax: [phone]
E-mail: [e-mail]
Web: www.broadcom.com
SGIN±
SCLK±
SGOUT±
{1:8}
{1:8}*
{1:8}*
{1:8}*
{1:8}*
{1:8}*
{1:8}*
{1:8}*
{1:8}*
{1:8}*
{1:8}*
{1:8}*