Description
No, you don't need to convert the configuration voltage when an Arria® 10 device is the master and older technology (pre-Arria 10) Intel® FPGA devices are the slave in multiple device AS configuration chain.
When an Arria 10 device is used as the master in multiple device AS configuration, the configuration voltage must be 1.8V. Although older technology Intel FPGA devices do not support 1.8-V configuration voltage in AS configuration mode, the slave devices are actually required to be in Passive Serial (PS) configuration mode, and PS configuration supports 1.8-V configuration voltage.
So you can connect 1.8-V configuration voltage to the slave devices directly.