Another Cyclone III problem

Altera_Forum · ‎12-13-2010

Hi,

I've got a problem with configuring CycloneIII(EP3C120F780I7N) in AS mode on my custom board. Also when I

try to programm my EPCS64, Quartus programmer says that Device ID can't be read. Another thing is that after

I turn the power on I see strange AS signals from FPGA (Bank 1 is powered with 2.5V but nCSO=2.5V,

DCLK=2.5V, ASDO=2V, DATA0=2V). So it means that FPGA doesn't even try to configure itself.

Programming EPCS with .jic file also fails.

But if I try to configure FPGA via JTAG, everything works well.

I've already tried changing EPCS and even FPGA and it didn't help.

Any helpful suggestions?

Altera_Forum · ‎12-14-2010

Maybe the capacitance on your AS lines is too big. You should check values of your capacitors

Altera_Forum · ‎12-14-2010

That's it! The problem solved))

There were 87nF capacitors instead of 10pF. Company where my custom board was made failed.

Thanx))