184.108.40.206. Early Pin Planning and I/O Assignment Analysis
The HPS clock input resides in the HPS Dedicated I/O Bank shared with I/O from HPS peripherals such as Ethernet, mass storage flash, and UART console. It's location within this bank is user configurable.
GUIDELINE: Choose an I/O voltage level for the HPS Dedicated I/O.
The HPS Dedicated I/Os are LVCMOS/LVTTL supporting a 1.8V voltage level. Make sure any HPS peripheral interfaces (for example: Ethernet PHY, UART console) configured to use the HPS Dedicated I/O bank as well as board-level clock circuitry for the HPS are compatible with 1.8V LVCMOS signaling.