【应用笔记】AN447:Cyclone III和IV器件和3.3/3.0/2.5V LVTTL/LVCMOS I/O的接口(AN 447: Interfacing Cyclone III and Cyclone IV Devices with 3.3/3.0/2.5-V LVTTL/LVCMOS I/O Systems)
Altera公司的Cyclone III和IV器件兼容并支持3.3/3.0/2.5-V LVTTL/LVCMOS I/O标准。这篇应用笔记为LVTTL/LVCMOS I/O标准信号完整性问题提供了背景信息，并为3.3/3.0/2.5-VLVTTL/LVCMOS I/O标准和Cyclone III和Cyclone IV器件的接口，描述了操作指南。
Altera® Cyclone® III and Cyclone IV devices are compatible with and support
3.3/3.0/2.5-V LVTTL/LVCMOS I/O standards. This application note provides
background information for LVTTL/LVCMOS I/O standard signal integrity issues
and describes guidelines for interfacing
3.3/3.0/2.5-VLVTTL/LVCMOS I/O standards in Cyclone III and Cyclone IV devices.an447.pdf