Documentation: Cyclone III Devices

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I/O Interfaces, Protocols and Signal Integrity AN 447: Interfacing Cyclone III and Cyclone IV Devices with 3.3/3.0/2.5-V LVTTL/LVCMOS I/O Systems (ver 2.0, Nov 2009, 396 KB ) AN 479: Design Guidelines for Implementing LVDS Interfaces in Cyclone Series Devices (ver 1.1, Jun 2009, 435 KB ) AN 508: Cyclone III Simultaneous Switching Noise (SSN) Design Guidelines (ver 1.0, Dec 2007, 379 KB )

Full article: http://www.altera.com/literature/lit-cyc3.jsp