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Altera_Forum's avatar
Altera_Forum
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18 years ago

Cyclone 3 board acting up.

Hi, My Cyclone 3 board has been acting up. Quartus does not detected the USB Blaster Interface when I try to program it. I connected a DE2 which it detects. The Cyclone LEDs count like the...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

What are you probing with? Make sure that you are using a high impedance probe (10 Mohms or more). I've seen windows lose usb devices like that due to shorts or loading pins (aka making Vcc dip) . Losing the USB device while probing is not a good thing.