As can be seen in the diagram on this slide, the Cyclone® IV FPGA I/O architecture offers selectable I/O standards in each I/O bank and features programmable drive strength, slew rate, and on-chip termination. Selectable I/O options such as open drain output, bus-hold, a programmable pull-up resistor, and PCI-clamp diodes that can be set for each independent I/O block are also included.