Description
Due to a problem in the Intel® Cyclone® 10 LP Core Fabric and General Purpose I/Os Handbook, it is wrongly described that "Intel® Cyclone® 10 LP devices offer the option to select CLKUSR as the external clock source for DCLK" and this function can be set in the Intel® Quartus® Prime software in the Configuration tab of the Device and Pin Options dialog box.
Intel Cyclone 10 LP devices don't support the usage of CLKUSR as the clock source for Active Serial (AS) configuration.
Resolution
This information is scheduled to be corrected in a future release of the Intel® Cyclone® 10 LP Core Fabric and General Purpose I/Os Handbook.