About the HVIO Interface

The HVIOs are grouped into banks. Each bank has its own VCCIO33 that sets the bank voltage for the I/O standard. Each HVIO consists of I/O logic and an I/O buffer. I/O logic connects the core logic to the I/O buffers. I/O buffers are located at the periphery of the device.

Table 1. HVIO Signals (Interface to FPGA Fabric)
Signal	Direction	Description
I[1:0]	Output	Input data from the HVIO pad to the core fabric. I[0] is the normal input to the core. In DDIO mode, I[0] is the data captured on the positive clock edge (HI pin name in the Interface Designer) and I[1] is the data captured on the negative clock edge (LO pin name in the Interface Designer).
ALT	Output	Alternative input connection (in the Interface Designer, Register Option is none). HVIO only support pll_clkin as the alternative connection.
O[1:0]	Input	Output data to HVIO pad from the core fabric. O[0] is the normal output from the core. In DDIO mode, O[0] is the data captured on the positive clock edge (HI pin name in the Interface Designer) and O[1] is the data captured on the negative clock edge (LO pin name in the Interface Designer).
OE	Input	Output enable from core fabric to the I/O block. Can be registered.
OUTCLK	Input	Core clock that controls the output and OE registers. This clock is not visible in the user netlist.
INCLK	Input	Core clock that controls the input registers. This clock is not visible in the user netlist.

Table 2. HVIO Pads
Signal	Direction	Description
IO	Bidirectional	HVIO pad.