Reconfigure FPGA another using NIOS II SoC

--- Quote Start ---

Cyclone IV devices are not supported for this

--- Quote End ---

The Cyclone IV devices support passive serial mode and configuration from SPI flash. Take a look at the TS4 design documentation on this page:

https://www.ovro.caltech.edu/~dwh/wbsddc/

(The board never made it to the 'real-world', but the design files have useful info)

If you need fast configuration, then you can use a MAX II or MAX V device as the programmer (passive serial controller), and Quad-SPI flash as the data source. The MAX II/V can read the flash at up to 100MHz, so you can program the Cyclone IV fairly quickly.

Cheers,

Dave