How to use an EPCS Flash

Hallo,

I'm already working on this problem. I could not get any data out of this flash. I recently tried to access the flash over a simple spi after booting.

So I multiplexed the signals. I boot over EPCS controller and the the NIOS switches the the signal to a spi.

Then I try to send an RDID command over the spi interface.

With the oscilloscope I see, that the clock is right. Also the CSn and the Data signal seems to be right. But the Flash never answers...

I tried the same withe a READ command -> no answer!

Has anybody an idea about this behavior?

Greets

Sim