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Kodion22's avatar
Kodion22
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1 year ago

Cyclone 3 Not entering AS Mode

Before i start, will love to say am new to FPGA and entry level with Electrical. We have an old tool we purchase that has a Cyclone 3 board on it. We have a simple code (attached) that we can easil...
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Programmable Logic Device
sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
1 year ago

If you're not seeing the 30 or 40 MHz output on DCLK, maybe the device is damaged, causing a problem with the internal oscillator that drives DCLK. Is this a single board or happening on multiples?

  • Kodion22's avatar
    Kodion22
    Icon for New Contributor rankNew Contributor
    1 year ago
    Thanks for the swift response. I have manufactured 4 boards and the same thing. I have purchased multiple cyclone 3 chips and they all behave same way. Am able to connect via jtag with no issues but can never connect AS or if I load .pof code externally on the memory chip, it doesn't seem to be running. Also, the DCLK is not showing 30 to 40mhz.

    Is the chip supposed to be showing that constant 30-40mhz on DCLK? If not, can any other external thing be a factor? Lime capacitor or resistors. I just don't understand the natural behavior of this FPGA