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.
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.
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 | - | - |
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.
VccIO can be externally supplied over the B2B connector J4. If bank B0 is not used, then VccIO can be left open.