I'm working on a project on spartan 6 using xilinx ISE 14.7. When I opened a schematic view, I cannot recognize the red triangle between those connections, which I think should not be an predefined block such as buffer. Is that an amplifier? If it's true, why it put in an opposite way? I'm new to fpga, thanks a lot for any help.
when I check the signals it shows two IOCLK as output pin and the others as input pin.