BCM5404 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – QUAD PORT 10/100/1000 BASE - T GIGABIT COPPER TRANSCEIVER

BCM5404 OVERVIEW
BCM5404 Block Diagram
TRD [3:0]+ {1:4}*
XTALI
XTALO
RDAC{1:2}*
TX DAC
16
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}*
*{1:4} Refers to the four separate Gigabit transceivers in the BCM5404
Modes
The BCM5404 consists of four complete 10/100/1000BASE-T
Gigabit Ethernet transceivers integrated on a single monolithic
CMOS chip. The BCM5404 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 BCM5404
enables a new class of cost-effective Gigabit Ethernet equipment,
driving the delivery of Gigabit bandwidth to the desktop.
The BCM5404’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 BCM5404 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 BCM5404
enables twice the density of previous Gigabit PHY transceivers.
With packaging options, high density switches can be easily
acheived. In addition, the BCM5404 has extremely low EMI
emissions, which reduces the design constraints required to meet
EMI radiation 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.
Each port of the BCM5404 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 BCM5404 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 BCM5404 is fully compatible with the IEEE 802.3
standard for auto-negotiation of speed, but additionally supports
Ethernet@WireSpeed™. Ethernet@WireSpeed™ allows the
BCM5404 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 BCM5404 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 IEEE 802.3 Standard Gigabit Media
Independent Interface (GMII), and industry standard Ten Bit
Interface (TBI), the BCM5404 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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Irvine, California 92619-7013
© 2003 by BROADCOM CORPORATION. All rights reserved.
5404-PB03-R-6.13.03
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