I'm using Quartus-II Rev. 18.1 in order to program .jic file into ISSI IS128LP128 flash memory at active serial mode, but without success.
1). How should I connect IS128LP128 (8-pins) to Cyclone-V-GX?
Do you have an example ?
Where should be connected pin ASDO of the FPGA-to SI of the flash?
2). ISSI flash components are absent from "Configuration Device" Tab.
What option should I choose instead?
It is not possible to use Quartus 18.1 as there is no way to customize the flash used.
1) I am not able to find IS128LP128 datasheet. If this is a serial configuration flash then you should be able to follow the same connection as other flash.
2) You may need to use Quartus 19.1 for write, erase and FPGA initialization.