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→Internal / External VCC-INT
There is also two banana jacks which can be connected to a 1.0V lab supply. You must be very careful to ensure you do not exceed 1.10V on this input, as beyond that range you risk damaging the FPGA.
The choice of internal/external is selected with the switch. There is a ferrite bead + large capacitors after this switch, so note that you '''cannot''' use the banana jack inputs as a voltage glitch insertion method. Instead you must insert them directly into the SMA connectors, described later. [[File:psw_2.jpg|400px]]
=== Shunt Resistor Connections ===