Are the VCCA [1..n] power supplies connected to each other internally inside the device for Cyclone III devices ?

Description

No, the VCCA[1..n] power supplies are not connected to each other internally for Cyclone® III devices. Each VCCA pin must be powered, even if the PLL is not used in your design.

Refer to the Cyclone III Device Family Pin Connection Guidelines (PDF) for further guidance on decoupling and isolation for this supply.

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