Is it possible to use the unused area of the EPCS device as data area other than configuration data?
If you want to access the EPCS device after entering user mode, you can do so by including ALTASMI_PARALLEL (Active Serial Memeory Interface) in your design.
ALTASMI_PARALLEL can be designed using the MegaWizard Plug-In Manager.
For details, please refer to the application note AN379 at the URL link below.
https://www.altera.com/en_US/pdfs/literature/an/an379.pdf
As stated in the application note, please note that access to the configuration data area is deprecated.
Experienced FAE
Free consultation is available.
From specific product specifications to parts selection, the Company FAE will answer your technical concerns free of charge. Please feel free to contact us.