What single-ended I/O electrical standards are supported in Cyclone III FPGAs?
Cyclone III FPGAs support a variety of single-ended I/O standards, including LVTTL, LVCMOS, SSTL, HSTL, PCI, and PCI-X. Single-ended I/O standards provide more current drive capacity than differential I/O standards, and they are critical when working with advanced memory devices such as DDR, and DDR2 SDRAM, and QDRII SRAM devices. Cyclone III FPGAs also support a programmable drive strength control for certain I/O standards with settings ranging from 2 mA up to 16 mA.
