• Eight independent retimer channels supporting multiple data
rates from 1.0 to 3.2 Gbps, including 1.06 Gbps, 1.25 Gbps,
2.12 Gbps, 2.488 Gbps, 2.5 Gbps, 2.667 Gbps, 3.125 Gbps, and
3.1875 Gbps
Multiconfigurable to support various operating modes
• Eight independent 1.0- to 3.2-Gbps retiming channels (single
clock domain)
• Dual XAUI™/CX4/LX4 to XAUI/CX4/LX4 retiming
channels with redundancy compatible to IEEE802.3™ae
• Dual XAUI/CX4/LX4 to XAUI/CX4/LX4 retiming switch
Low power dissipation
• Less than 400 mW per retiming/switch channel including I/O
High-performance programmable receive equalization and
transmit pre-emphasis
• Transmit pre-emphasis for interoperability with CML SerDes
• Receive equalization for copper interconnects
Enhanced test capability
• Full loopback, BIST, 10G BERT, and random Ethernet packet
Compact 23-mm × 23-mm package with no external
components required
• No requirement for heat sink or airflow
• One device supports a variety of applications including Gigabit
Ethernet, 1× and 2× Fibre Channel, OC-48 SONET (with/without
FEC), InfiniBand®, 10-GbE, 10-Gigabit Fibre Channel, or others.
• Flexible architecture supports programmable configurations
enabling an aggregate usable data rate of over 40 Mbps. Built-in
redundancy mode provides high availability to support critical line
side or backplane applications. The high-speed to high-speed
retimer mode extends the use of longer traces on line-card designs.
• Advanced 0.13µ CMOS process technology provides unparalleled
performance while achieving the lowest possible power
• Eases linecard designs to allow for multiple connectors or low-cost
PCB materials such as FR4.
• Drive PMD devices or backplane directly with no external cleanup
circuit required.
• Simplifies manufacturability with integrated built-in self-test
(BIST), full loopbacks, and programmable PRBS generator/
• Decreases complexity and reduces board space on multichannel
linecard designs.
• 1-GbE and 10-GbE LAN, MAN, WAN switches and routers
• 1×, 2×, or 10-Gigabit Fibre Channel, InfiniBand, SONET network cards
• 40-Gbps backplanes and backplane extenders
• Advanced test equipment (ATE)
Dual Independent XAUI Cross-Link Application Diagram
BCM8040 Block Diagram
The BCM8040 device integrates four independent XGXS (XGMII
eXtender sublayer) cores leveraging Broadcom’s high-performance
mixed-signal design experience along with advanced 0.13µ CMOS
process technology. This, combined this with a robust architecture
offering the highest degree of flexibility, results is a highly
programmable, lowest power retimer solution for network line card and
backplane applications.
An internal MUX connects each serial channel to enable fully redundant
operation. The MUX enables an active serial link to be switched to the
primary channel, while a protection serial link can be continuously
monitored to insure its condition. If the active link fails, the protection
link can be switched over through external control to ensure continued
system operation.
Each transmitter and receiver interface supports serial transmissions
rates ranging from 1 Gbps to 3.2 Gbps. An on-chip phase lock loop
(PLL) synthesizes the supplied reference clock to support the desired
transmit rate, while clock and data recovery (CDR) units recover the
receive rate clock for timing. The interface can support single-channel
(octal) or dual-channel quad (XAUI) differential CML I/O.
For high-speed serial copper connections, the device incorporates both
transmit pre-emphasis on the transmit channels and receive equalization
on the receive channels. Transmit pre-emphasis is programmable to
improve the overall cable reach and compensate for electrical
imperfections associated with traces and connectors. Receive
equalization provides optimal performance over a variety of receive
Highly programmable test capabilities within the device support
loopbacks using generators/checkers that provide PRBS 27 to 231
patterns along with IEEE802.3ae defined test patterns.
A complete evaluation kit, including an evaluation board, related
software, and documentation is available upon request.
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
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