Pin Information for the Cyclone™ II EP2C20 Device
Version 1.7
Note (1), (2)
VCCA_PLL[1..4] - Analog power for PLLs[1..4]. The designer must connect these pins to 1.2 V, even if the PLL is not used. Designer is advised to keep isolated from other VCC for better jitter performance.
VCCD_PLL[1..4] - Digital power for PLLs[1..4]. The designer must connect these pins to 1.2 V, even if the PLL is not used.
Надеюсь глагол "must" говорит сам за себя.
не повезло?