HD I/O pins contain an I/O interface logic (IOI) block that enables various I/O interfaces. HD I/O IOI consists of an OLOGIC and ILOGIC block dedicated for each pin.
Supported interfaces include the following:
•Asynchronous (or combinatorial) input and output interfaces
•System synchronous interfaces with SDR registers in the IOI and/or interconnect logic. Supported flip-flop primitives include the following.
°FDCE: flip-flip with clock enable and asynchronous clear
°FDPE: flip-flop with clock enable and asynchronous preset
°FDRE: flip-flop with clock enable and synchronous reset
°FDSE: flip-flop with clock enable and synchronous set
•Source synchronous interfaces with DDR registers in the IOI and/or interconnect logic. Supported primitives include IDDRE1 and ODDRE1.