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Spartan-6 architecture organizes I/Os into four I/O banks, see Table 1 see  the table below for supply voltage used for each bank.

VCCIO0 voltage can be configured in 3 ways:

• 2.5V - When resistor R103 is populated and resistor R102 is not populated.
• 3.3V - When R103 is not populated and resistor R102 is populated.
• 1.2 V ÷ 3.3 V (External supply) - When R103 is not populated and R102 is not populated. In this case external supply source have to be connected to pins 1, 2, 3, 4 of J4 B2B connectorSee connector⁽¹⁾.

 ⁽¹⁾ See Spartan-6 documentation fo VCCIO power range

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See  See the figure below to locate R102 and R103 on PCB.

Scroll pdf title
title R102 and R103 location

Note that some of Spartan-6 I/O types are partially compatible, so pins of compatible types can be used as inputs for signal of other type. See "Spartan-6 FPGA SelectIO Resources" page 38 for detailed information.

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