The initialization clock source is from the internal oscillator, CLKUSR pin, or DCLK pin
By default, the internal oscillator is the clock source for initialization. If you use the internal oscillator, the Intel® Cyclone® 10 LP device is provided with enough clock cycles for proper initialization.
The CLKUSR pin provides you with the flexibility to synchronize initialization of multiple devices or to delay initialization. Supplying a clock on the CLKUSR pin during initialization does not affect configuration.
The CLKUSR pin allows you to control when your device enters user mode for an indefinite amount of time. You can turn on the Enable user-supplied start-up clock (CLKUSR) option in the General page of the Device and Pin Options dialog box in the Intel® Quartus® Prime software. When you turn on this option, the CLKUSR pin is the
initialization clock source.
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