博通BM8073 10GbE收发方案
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博通公司的BCM8073 双路10GbE串行收发器,满足新的IEEE 10GBASE-KR标准.
BCM8073集成了不得专业的接收均衡器,能使现有的背板系统运行在1G或XAUI的数据速率,并使每个通路有4X或10X的带宽改善,广泛应用在背板连接,铜电缆的堆栈连接以及板内和板与板间连接.本文介绍了BCM8073的主要性能以及优势,方框图和系统方框图.
BCM8073 XAUI™ to Dual-Channel Serial 10GBASE-KR Backplane Transceiver
The BCM8073 is a dual-channel 10-GbE serial transceiver targeting the new IEEE 10GBASE-KR standard for running 10G serial data over backplane systems. The device incorporates sophisticated receive equalizers, which extend the life of legacy systems currently running at 1G or XAUI data rates by providing a 4x or 10x bandwidth improvement on each channel.
On-chip clock synthesis is performed by the high-frequency, low-jitter phase-locked loops (PLL) for the PMD and XAUI output retimers. Individual PMD and XAUI clock recovery is performed on the device by synchronizing directly with the respective incoming data streams. An external 25-MHz or 156.25-MHz oscillator is required for the reference clock input.
The BCM8073 dual Ethernet 10GBASE-KR PHY is a fully integrated dual SerDes (10.3125 Gbps) interface device performing the extension functions for a 10-GbE reconciliation sublayer (RS) interface. The XGXS, PCS, and PMA include 8B/10B coding, 64B/66B coding, SerDes, a clock multiplication unit (CMU), and clock and data recovery (CDR).
Polarity of the XAUI and 10G differential pairs can be reversed to facilitate layout. The ordering of the XAUI lanes can also be changed.
The BCM8073 is available in a 19 mm × 19 mm, 1-mm pitch, 324-pin BGA, RoHS-compliant package.
主要特性:
Two 10G-XAUI interfaces in one compact package
High-performance DFE/FFE receive equalizer with full adaptation on chip
Multitap transmit preemphasis with automated start-up routine
Auto-negotiates to 1.25G/10G
Complete 1G and 10G PCS layers
Low-power equalization mode for shorter reach stackable systems
Programmable amplitude control on 10G serial transmitter
Selectable FEC encoder/decoder for added performance
Input sensitivity 20 mV peak-to-peak differential
Multiple interface support
PMD interface: Serial 10.3125-Gbps CML
4-lane XAUI (3.125 Gbps)
Low-power 65-nm CMOS design with 1.2W/10G KR port
Core supply—1.0V, I/O—3.3V
Loss-of-signal detection
On-chip diagnostics include 10G eye monitor, SNR, and BER monitors
Integrated packet generator and checker
19 mm x 19 mm, 1-mm pitch, 324-pin BGA, RoHS compliant package
主要优势:
Targeted to meet the IEEE 802.3ap standard
High-performance equalization supports new and legacy backplane channels.
XAUI and 10G differential pairs can be reversed to facilitate layout.
Enhanced diagnostics provide users with signal quality monitors.
Single 156.25-MHz or 25-MHz REFCLK reduces overall linecard BOM cost.
Low-latency design for high-performance computing.
应用:
Backplane links
Copper-cable stackable links
Onboard and board-to--board links
图1.BCM8073方框图
图2.BCM8073系统方框图
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