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.