184.108.40.206. Additional Guidelines for Cyclone V Devices
I/O Pins Connect to Ground for Hard Memory Interface Operation
According to the Cyclone V pin-out file, there are some general I/O pins that are connected to ground for hard memory interface operation. These I/O pins should be grounded to reduce crosstalk from neighboring I/O pins and to ensure the performance of the hard memory interface.
The grounded user I/O pins can also be used as regular I/O pins if you run short of available I/O pins; however, the hard memory interface performance will be reduced if these pins are not connected to ground.
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