"Can't recognize silicon ID for device 1" while programming FLASH

Hi Nyosof,

Thanks for your answer.

I should add one more context : the epcs flash used is Cypress Spansion FL064PIF with SPI interface.

I did a few more investigation into the problem, here is what I got:

1. I continued testing the first "bug" board

1.1 I tried msel(3 downto 0) = "1011" and "1101" and "1001" and "1010", nothing changed, still can't program the .jic, but .sof could be programmed.

1.2 I tried mesuring VCC, SCLK , CSn, SI and SO of the EPCS chip, it seems at board powering up, the fpga tried to send command to the Flash via SPI, I haven't yet investigated into the detail of those commands.

2. I changed to another "good" board. and I find the reason of BUG.

2.1 I re-programmed several times the new "good" board with old "good" .sof and .jic, all good.

2.2 I then found that I forgot to add the .sdc file in my "bug" project. So I add it and re-compile the project, re-programmed with the .sof and .jic, all good.

2.3 I then re-programmed this board with the "BUG" .jic, and like the first board, this board can't access to the Flash any more, but this time I can re-program the Flash, but when I power down and up the board, the fpga can't be configured by the Flash..

Due to my stupid tests, I now have two valuable boards non functionnal...

I wonder if my .jic wothout .sdc has destroyed the FPGA? but I can still program the .sof to fpga... i think i'm running into a situation super complicated...

Hope you can give me some advices.

Thanks very much.