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Altera_Forum's avatar
Altera_Forum
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16 years ago

Stratix II Configuration Problem

Hi, We are having some issues configuring a stratix II FPGA. From quartus we can successfully program the flash from Quartus but the FPGA does not always configure correctly when power is applied....
Altera_Forum's avatar
Altera_Forum
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16 years ago

You're schematic isn't attached. Can you attach it?

Clarifications:

1 - So you say that the FPGA seems to always successfully configure when you have a scope probe on the CONF_DONE pin?

2 - Not seeing the schematic, it sounds like your traces are T'd going between the three devices (EPCS64, Stratix II, & Cyclone III). How does the signal integrity look on the Active Serial configuration pins?

3 - Are you using fast active serial or regular active serial? If fast, are you able to try slow?

4 - Have you probed the nConfig pin to see if something is happening there? Is the nConfig pin properly pulled high?

5 - Do you have sufficient grounding to the FPGA?

Can you list any differences you can think of between this design and the other board that works properly?

Jake