Application Note: Spartan-3 Families Eliminating I/O ...

around the perimeter of the die. Each Spartan-3 device has eight banks, while Spartan-3E and Extended Spartan-3A (Spartan-3A, Spartan-3AN, and Spartan-3A DSP) devices have four banks. An independent VCCO rail per bank (for example, VCCO_0, VCCO_1, etc.) powers the output buffers associated with the User I/O pins in each bank. ................
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