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Altera_Forum
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16 years ago

JTAG can’t find device

Hi all, I am a beginner of Altera's device. Today, When I use the JTAG mode of Quartus’ programmer to configure the device EP3C5E144, the programmer always says “Unable to scan device chain. Can...
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Altera_Forum
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16 years ago

Difficult to say, with this little information. Is there a chance you could post your schematic?

TDO is high-Z in the beginning. So you should see a high on this pin, if it has a pull-up resistor.

-- Ton