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Altera_Forum
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8 years ago

cyclon does not load

HI, I have an architecture with: - cyclon iv ep4ce6e22c8n with a programming chip epc64n it is a new release of an old schematic working fine, just the PCB was changed. I am able to load wit...
Altera_Forum's avatar
Altera_Forum
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8 years ago

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HI,

thank you for reply,

the MSEL lines are wired to value of 2, means R42 mounted with value of "0" ohm, R39 mounted with value of "0" ohm, R30 mounted @0hm, R41, R29 and R40 are absent-.

thank you, please help with any other suggestions

thank you

maurizio stefani

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That should work. I would then check that the power supply power up meets the FPGA specs (ie, power supply sequencing, ramp rates are as required). I would also check for any unintended PCB solder shorts on the FPGA device. Do you have another board, and if so does it behave identically?

Your signal waveforms as shown in your first post show a substantial amount of noise. It could be real, or it could be due to how your probes are attached. It would be interesting to see the DCLK and DATA waveforms at a more expanded scale (ie, higher horizontal resolution).