OVERVIEW
BCM8706
Elastic FIFO
Randomizer
Gearbox
XAOP
XAON
3.125
Gbps
Serializer
8B/10B
Encoder
64/66B
Synchronizer
Descrambler
Decoder
CDR and
Deserializer
MMF EDC
DSP Core
PDIP
AGC
PDIN
322.26M
312.5M
8K ROM
25 M
Hz,
156.25 M
Hz
REFCLKP
REFCLKN
312.5M
Sync. Detect
Lane Sync
8B/10B
Decoder
Sync. Detect
Lane Sync
8B/10B
Decoder
Lane
Alignment
FIFO
CMU
156.25M
8K RAM
SPI
uC
SPI
RefClk
Block
312.5M
322.26M
Elastic FIFO
64/66B
Synchronizer
Descrambler
Decoder
Gearbox
XAIP
XAIN
3.125
Gbps
DLL and
De-serializer
CMUR and
Serializer
PDOP
PDON
XDIP
XDIN
MDIO
MDC
PRTAD[4:0]
RSTB
LASI
SDA
SCL
DLL and
De-serializer
Lane
Alignment
FIFO
Management
and
Control
Interface
I2C Serial
Interface
JTAG
XAUI BIST Generator
PMD BIST Generator
XAUI BIST Checker
PMD BIST Checker
PRBS Genertor and Checker
Optics
Control
and
Status
OPRXLOS
OPTMPFLT
OPBIASFLT
OPPWFLT
OPTXENB
OPRSTB
BCM8706 Reference Design
The BCM8706 incorporates a receive equalizer that supports Electronic
Dispersion Compensation (EDC) over multimode fiber (MMF). The
EDC equalizer is designed for applications over MMF covering
distances up to 220m of OM1, OM2, OM3 fiber as per the IEEE
standard. The BCM8706 will be fully compliant with the IEEE802.3aq
standard. In enhanced performance mode, the BCM8706 is capable of
supporting up to 300m over OM1, OM2, and OM3 fiber.
An onboard microcontroller implements the control algorithm for the
MMF EDC DSP Core.
On-chip clock synthesis is performed by the high-frequency low-jitter
phase-locked loops for the PMD and XAUI output retimers. Individual
PMD and XAUI clock recovery is performed on the device by
synchronizing directly to the respective incoming data streams. An
external 25-MHz or 156.25-MHz oscillator is required for the reference
clock input.
The BCM8706 Ethernet LRM PHY is a fully integrated SerDes (10.3125
Gbps) interface device performing the extension functions for a 10-GbE
Reconciliation Sublayer (RS) interface. The XGXS, PCS, and PMA
functions include 8B/10B coding, 64B/66B coding, SerDes, Clock
Multiplication Unit (CMU), and Clock and Data Recovery (CDR).
The BCM8706 is available in a 13 mm
×
13 mm, 256-pin FBGA, RoHS
compliant 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.
8706-PB00-R
05/16/06
Phone: 949-450-8700
Fax: 949-450-8710
E-mail: info@broadcom.com
Web: www.broadcom.com
10.3125
Gbps
XDOP
XDON
Serializer
8B/10B
Encoder
BOARDCOM [ Broadcom Corporation. ]
