Stratix IV GXB Refclk IO standard settings

Thank you Oliver. I know my clocking scheme is a little bit odd but we are using Altera dev board to prototype a design and the clock I want to use (with the right clock frequency) is unfortunately tied to a refclk to a GXB. I have to use this clock to generate clocks for FPGA fabric and a refclk for another GXB.... Once we got our own board build this situation will go away.