BCM8481 Просмотр технического описания (PDF) - Broadcom Corporation
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BCM8481 Datasheet PDF : 2 Pages
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OVERVIEW
XAOM/SGO
+
-
XBOM
+
-
XCOM
+
-
XDOM
+
-
XAIM/SGIM +
-
XBIM
+
-
XCIM
+
-
XDIM
+
-
XTALN
XTALP
MDC
MDIO
MDIO_
MODE
SI
SCK
CSb
SO
XAUI/SGMII
MAC
Interface
Frame
and
Scramble
LDPC
Encode
4D DSQ
128 Map
Deframe
and
Descramble
LDPC
Decode
4D DSQ
128 Soft
Decisions
4D Pre H
Decode
4D DAC
Matrix
Xtalk
Canceller
and
Equalizer
4D Clock
Recovery
4D ADC
Clock
Generator
MDIO
Management
Interface
SPI
MII
Registers
XAUI/1000BASE-X/
100BASE-FX
Interface
LED
Controller
TRD[0:3]
+
-
XAOL/SOL
+
-
XBOL
+
-
XCOL
+
-
XDOL
+
-
XAIL/SIL
+
-
XBIL
+
-
XCIL
+
-
XDIL
5 LED
BCM8481 Single Chip Block Diagram
The BCM8481 is a complete 10/100/1000/10GBASE-T solution
operating at 100m over CAT6a or CAT7 unshielded twisted pair (UTP)
cable. It is based on highly advanced digital signal processor-based
architecture to allow robust operation over UTP wiring. It is a highly
integrated solution combining an enhanced analog front-end with digital
adaptive equalizers, ADCs, phase-locked loops, line drivers, LDPC
encoders and decoders, echo cancellers, crosstalk cancellers, and all
required support circuitry.
The BCM8481 is optimized to enable switch, controller, and other
general 10 Gigabit Ethernet connectivity applications. It supports the 4-
lane 3.125 Gbps XAUI interface to allow connectivity to 10 Gigabit
Ethernet MACs. One lane of the 4-lane XAUI interface is reserved to
support the SGMII interface to support lower speed 10/100/1000BASE-
T operation.
The product also includes a pass-through XAUI interface mode to allow
optional connectivity to a fiber-optic module. Again, one lane of the
pass-through XAUI interface is reserved to support lower speed
100BASE-FX and 1000BASE-X fiber applications using the SerDes
interface. Switching between copper and fiber media can be
accomplished either automatically or through software control. The
BCM8481 monitors copper link and fiber detect status and, based on
priorities set at initialization, automatically swaps either copper traffic or
fiber traffic to the MAC interface.
This device is another member of Broadcom’s 65-nm copper PHY
family, joining the BCM54880 and BCM54684. The 65-nm process
offers the best performance, lowest cost, and lowest power for 10 Gigabit
copper solutions. Furthermore, devices based on the 65-nm 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.
The BCM8481 incorporates a number of advanced features. A link
quality indicator LED provides instant notification of any problems with
the wiring plant operating at the desired speed. This includes physical
wiring defects that the BCM8481 cannot automatically correct 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.
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
5300 California Avenue
Irvine, California 92617
© 2008 by BROADCOM CORPORATION. All rights reserved.
8481-PB01-R
04/15/08
Phone: 949-926-5000
Fax: 949-926-5203
E-mail: info@broadcom.com
Web: www.broadcom.com
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