Flash programmer does not verify on custom board

Hi All,

I've been working with QuartusII 5.0 and the NiosII core (also 5.0) in the Cyclone II devkit ep2c35 part. I do not yet have a custom board but I am trying to get things with this Nios core worked out, on the devboard, before I design my board.

I have designed a processor with a custom peripheral, it works on the devboard when I use the factory TARGET BOARD, it downloads and runs fine.

Here is the problem, I followed the instructions in the flash programmer manual to port the flash programmer to a custom board. My custom board has only one flash device (EPCS16). I am able to generate the flash programmer and it shows up in the target board list. When I use the custom target board to program my devboard it reads the EPCS device slowly, it seems to try to write to it but it will not verify.

I have tried a pll to speed up the clock but it still reads very slow (about half the speed of the factory target board).

I have followed the manual to the letter and have generated the target board several times with the same result.

Does anyone have any ideas!!!

Best Regards

Tim