BCM5248 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – 10/100BASE-TX OCTAL-Φ TRANSCEIVER

OVERVIEW
TD+/-
RD+/-
SD+/-
REF_CLK
BIAS
JTAG
Multimode
Xmt DAC
HP
Auto-
MDIX
ADC
Cable
Auto-Check
CRS/Link
Detection
Clock
Generator
Bias
Generator
JTAG
TAP+BS
Digital
Adaptive
Equalizer
TXD[3:0]
TXEN
10BASE-T ^TXER
PCS
TXC
COL
RXC
CRS
100BASE-X
PCS
RXDV
RXER
RXD[3:0]
MII
to
SMII
Auto-
Negotiation/
Link Integrity
Clock
Recovery
LED
Controller
MII
Registers
BCM5248
MII
Management
Control
TXD(1:8)
SSYNC
SSSMII_TXC
SSSMII_RSYNC
SSSMII_RXC
RXD(1:8)
SLED_D0
LED1{1:8}
LED2{1:8}
LED_CLK
MDC
MDIO
BCM5248 Reference Design
The Broadcom BCM5248 is a single-chip device containing eight
independent Fast Ethernet transceivers. Each performs all of the physical
layer functions for 100BASE-TX full- or half-duplex Ethernet on
category 5 UTP cable and 10BASE-T full- or half-duplex Ethernet on
category 3, 4, or 5 UTP cable. The BCM5248 chip performs encoding
and decoding, clock and data recovery, digital adaptive equalization, line
transmission, carrier sense and link integrity monitoring, auto-
negotiation and SMII/SSSMII management functions. The BCM5248 is
compliant with the IEEE 802.3 standard.
The BCM5248 offers alternative connection to fiber optic modules for
100BASE-FX operation. The enhanced FX mode allows 100BASE-FX
operation without the use of signal detect pins. The standard FX mode
allows 100BASE-FX operation with modules that require the PHY to
use signal detect inputs to disable receive data in the absence of a
received optical signal.
The BCM5248 can be connected to a switch controller through the SMII
or SSSMII on one side and to the network media on the other side
through isolation transformers. The BCM5248 operates from 1.8 and
2.5V/3.3V power supplies; the I/O operates at either 2.5V or 3.3V.
The BCM5248 contains an advanced cable diagnostic capability to
detect shorts or opens in a UTP cable and the distance to the fault,
allowing system administrators to quickly determine the source of a
fault. Additionally, the BCM5248 can detect the length of a good,
operating link, which allows mapping of an entire physical cable plant.
The BCM5248 includes support for HP Auto-MDIX which enables the
transceiver to automatically detect and correct cable that is wired
incorrectly. With the HP Auto-MDIX feature, all ports on a switch can
be connected to any other 10/100 port on any switch, hub, or network
interface card, using crossover or straight-through cables
interchangeably. This makes installation, debugging, and maintenance
of the network simpler and less expensive to the end user.
In addition to two fully programmable LED driver pins per port, the
BCM5248 also supports a serial LED driver output that can be used to
drive up to eight LEDs per port, to indicate the status of link, speed,
duplex, transmit or receive activity, or arbitrary functions programmed
by the user. The BCM5248 is offered in a 128 PQFP and a 256-ball BGA
package.
Broadcom^®, the pulse logo, Connecting everything^®, and the Connecting everything logo are among
the trademarks of Broadcom Corporation and/or its affiliates in the United States, certain other countries
and/or the EU. Any other trademarks or trade names mentioned are the property of their respective
owners.
®
BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2006 by BROADCOM CORPORATION. All rights reserved.
5248-PB01-R
04/17/06
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