Does the Cyclone IV support LVPECL?
Cyclone IV supports LVPECL, but only on dedicated clock input pins.
For more information, please refer to the Device Handbook at the URL link below and search for the keyword "LVPECL I/O".
https://www.altera.com/en_US/pdfs/literature/hb/cyclone-iv/cyiv-51006.pdf
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