Troubles while configuring Flex 10K20TC144 in PS mode from microcontroller

Hello,

Thanks for your answer.

About nSTATUS, the behavior is as per your answer, a low pulse which is the image of nCONFIG slightly delayed so it goes high during the whole configuration process.

Sorry, by FPGA I mean the Flex, which I mistakenly called FPGA. But the Flex is not a true FPGA despite it has most of its characteristics.

1) Yes I use the .rbf file to configure the Flex.

2) What do you mean by "hardware setting has been checked"? Unless I missed something, the Flex is set up to be configured in passive serial (MSEL0&1 to GND, nCE to GND)

3) Not tested the SOF file as the content is quite different from that of .rbf file. As per my understanding the SOF file needs some conversion from an intelligent programmer, this is why my preference goes for .rbf, as it might be the exact binary image to send to the Flex.