Figure 2-4 Switch
S2: Default Settings on Serializer Board
Mode Select Resistor R19 is default set to 4.7kΩ for external oscillator mode. Replace R19 with 100kΩ for PCLK from imager mode.
On J2, a 3-pin header is factory placed as shown in Figure 3-4. This
selects power from U2 for 1.8V VDDIO and does not have the 3.3V VDDIO option
internally.