After jtag download success,CONF_DOEN pin is low!!

[Altera_Forum]

Hi everybody! 

My new board doesn't work! After jtag download success,CONF_DOEN pin is low and nCONFIG pin is high! Is there somebody know about it! Please help me ! Thank you!:confused:

[Altera_Forum]

Does conf_done go high for a while (some µs) or is it always down at the end of the programming? 

Maybe your board has not enough power to drive the design in the FPGA? Look at the core voltage (1.2V) and vccd_pll voltage. Is there a fall at the end of the programming?  Maybe it isn't a voltage issue but I had once a similar problem...

[Altera_Forum]

COF_DOEN is always low!

[Altera_Forum]

And the power is 1.2 and 3.3 after programming! 

There is no fall at the end of the programming!

[Altera_Forum]

OK! It works!

[Altera_Forum]

what was the problem?

[Altera_Forum]

nCS did not pull down!