2.1.6. Global Clock Network Power Down
You can disable the Intel® MAX® 10 GCLK (power down) by using both static and dynamic approaches. In the static approach, configuration bits are set in the configuration file generated by the Intel® Quartus® Prime software, which automatically disables unused GCLKs. The dynamic clock enable or disable feature allows internal logic to control clock enable or disable of the GCLKs.
When a clock network is disabled, all the logic fed by the clock network is in an off-state, reducing the overall power consumption of the device. This function is independent of the PLL and is applied directly on the clock network.
You can set the input clock sources and the clock enable (clkena) signals for the GCLK multiplexers through the ALTCLKCTRL Intel® FPGA IP parameter editor in the Intel® Quartus® Prime software.