1 Design Considerations

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The SmartFusion2/IGLOO2 devices support various high-speed interfaces using both Double Data Rate Input/Output (DDRIO) and SerDes I/O. DDRIO is a multi-standard I/O optimized for low-power DDR, DDR2, and DDR3 performance. SerDes I/O are dedicated to high-speed serial communication protocols. The SerDes I/O supports protocols such as PCI Express 2.0, 10 Gbps attachment unit interface (XAUI), Serial Gigabit Media Independent Interface (SGMII), JESD204B, and user-defined high-speed serial protocol implementation in fabric.

Routing high-speed serial data over a PCB is a challenge as losses, dispersion, and crosstalk effects increase with speed. Channel losses and crosstalk decrease the signal-to-noise ratio and limit the data rate on the channel.