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Altera_Forum's avatar
Altera_Forum
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15 years ago

Cyclone III stuck at POR?

Hi, I have problems to get a custom board work, the FPGA seems to be stuck in POR. It's a PCIe card with a EP3C10F256C7N. I attached an excerpt of the schematic to this post. I have 10 pro...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

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Should R19 be 10k? And should there be a 10k PU on TMS as well and a 1k PD on TCK.

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The Cyclone III handbook recommends 10k pull-ups for both TDI and TDO, but I think it's not very critical. In my circuit I have 1k pull-ups at TDI and TMS and a 1k pull-down at TCK, they're placed on another sheet of the schematic.

Regards,

Jürgen