On the reference design for the 8M Mini SOM, there is a capacitor connected to the NAND_DQS pin with the note "Dummy DQS for QSPI High Speed Timing" (see attached image). Can someone explain what the purpose of that capacitor is? How does it assist with QSPI High Speed Timing? Does the value of the capacitance matter?
I have a QSPI device that does not have a data strobe input, so can I just leave this pin unconnected? Or use it as a GPIO?