The module can be powered by the B2B connector or the USB connector. If both power supplies are available, the B2B connector power supply takes precedence, disabling the USB power supply automatically.
B2B Connector Power Suplly
The B2B connector power supply requires a single nominal 5 V DC power supply. The power is usually supplied to the module through the 5 V contacts (5Vb2b) of the B2B connectors J5 (see Appendix). The recommended minimum supply voltage is 4 V. The maximum supply voltage is 5.5 V. The recommended maximum continuous supply current is 1.5 A.
I/O Bank Power Supply
The Spartan-3E architecture organizes I/Os into four I/O banks (see the table below).
Bank | SupplyVoltage (V) | Min(V) | Max(V) |
|---|---|---|---|
B0 | VccIO | 1.2 | 3.3 |
B1 | 2,5 | - | - |
B2 | 3,3 | - | - |
B3 | 3,3 | - | - |
I/O banks power supply
Voltage for banks B1, B2 and B3 is fixed respectively to 2,5 V, 3,3 V and 3,3 V.
Voltage VccIO for bank B0 shall span from 1.2 V to 3.3 V. VccIO can be supplied either externally or internally to the micromodule.
Spartan-3 I/Os are not 5 V tolerant. Applying more than the recommended operating voltages at any pin, results in a damaged FPGA (see Xilinx Answer AR#19146).
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