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Altera_Forum
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16 years ago

Cyclone III not configuring

I have a 144 pin cyclone 3 that I'm trying to get working in a board design I've done. It is not configuring. I can see the TCK on the oscilloscope but no TDO data comes back from the FPGA. T...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Are you still getting no TDO on the oscope?

I can only see three possibilities:

1 - You're still not getting a good ground on that pad.

2 - Your design has a flaw. You could post your schematic and we could see if there are any issues.

3 - Your JTAG signal integrity has a problem. In this case, adding caps as indicated rodwill or source series terminators on the JTAG lines (my preference) may fix it.

Jake