Maximum Size of Flash Memory Supported by CycloneIII

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Thank you sir. This point is clear to me.

I want to discuss one more point with you. I want to configure this device with FPGA for general purpose use.

When i run the Memory Test, its give the error, "Flash is not open". Please guide me how can i debug this issue.

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Try debug into library code and find out what exactly generates the error. I guess the Altera HAL driver doesn't support that specific device size; if you are lucky it's simply a matter of adding the device code to the list of supported ones.

That was only my guess and I don't know if it could be a solution.

As I said in my previous answer, first of all you must find out the reason why the driver can't open the flash device.

Start the program with the debugger and step inside the alt_flash_open_dev function