How do I use the on board oscillator?
This "minimal development board" is set up as a barebones breakout for the CPLD, the clock is already directly connected to the CPLD, its up to you to use that CLK in for your purposes

Most of the pins are wired directly to the MAXII, Pin 64 is the GCLK3 pin on the Max II

Pin 64 is seen on the left of the screenshot in component U1B (which is one bank of the CPLD pins) It is also connected to Pin 34 on Header P2 as seen in the screenshot below it.




To use it you have design your core to use PIN64 (using TQFP numbering) which is named IO_GLK3 in your CPLD definition