Why is the option to "Use differential mode" greyed-out in the ALTIOBUF IP core?

Question

According to AN 522, differential mode is supported in Cyclone III devices. I am using Quartus 9.1 and cannot upgrade.

shafiqy_intel · Answer

Hi SLuon2,ALTIOBUF IP core is not supported Cyclone III. You may refer to ALTIOBUF IP user guide below for supported devices:https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug_altiobuf.pdfThanks

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Why is the option to "Use differential mode" greyed-out in the ALTIOBUF IP core?

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