Description
Reconfiguration of the VCO post-scale divider is only supported in the Quartus® II software versions 13.0 and later via the PLL_RECONFIG Intel® FPGA IP.
Resolution
The address offset for the register that controls this setting is 011100. Writing a '0' sets a VCO divide value of 1. Writing a '1' sets a VCO divide value of 2.