dac5682z hsmc EP4SG530KH

I want to take FPGA and dac5682z through the HSMC link together to set the DAC sdenb to end, but did not find a suitable pin, encountered the problem is the lowest level of HSMC pin 2.5V side, DAC pin up to 2.3V, the typical value is 1.8, want to ask, the available sdenb pin.https://alteraforum.com/forum/attachment.php?attachmentid=14694&stc=1 https://alteraforum.com/forum/attachment.php?attachmentid=14695&stc=1 7777 is rtl viewer