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The DIP-switch S2 is to set different modes of powering the on-board components, the I/O voltages and to enable programming the SC adapter board CPLD by JTAG interface:
| S2 | ON | OFF | Default | Description |
|---|---|---|---|---|
| 1 | Normal mode | Adapter board CPLD update mode | ON | Update Mode JTAG access to SC CPLD only |
| 2 | Do not use (illegal setting) | Normal mode | OFF | Must be in OFF state always. |
| 3 | VIO connected to 3.3V | Power VIO from pin header J2 | OFF | User I/O Voltage |
| 4 | Power 3.3V from USB | Power 3.3V from pin header J2 | OFF | Power on-board peripherals (FTDI chip & SC CPLD, ...) |
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