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The placer enforces a single VCCO per bank. LVDS_25 forces Bank 14 to VCCO=2.5V, which conflicts with LVCMOS33 (needs 3.3V). Changing adc_pwdn to LVCMOS25 resolves [Place 30-372] bank incompatibility. The AD9484 PWDN pin has CMOS-level thresholds (~0.8V), so 2.5V output drives it correctly.