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LVDS_33 is not a valid I/O standard on 7-series FPGAs. The correct standard for LVDS inputs in HR banks with VCCO != 2.5V is LVDS, which works with any VCCO for input-only buffers (IBUFDS). LVDS_25 requires VCCO=2.5V exactly. Note: the 50T FTG256 build still fails at placement due to pin overflow (113 ports vs 69 available pins) — this is a pre-existing package limitation unrelated to this fix.