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Altera_Forum
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17 years ago

Cyclone III user I/O stay LOW during JTAG configration

Hi,all I found all user I/Os became LOW during JTAG configruation in my situation. The device is Cyclone III 3C35. However, it is said that user I/Os must be tri-stated during JTAG configuration i...
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Altera_Forum
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17 years ago

Thanks to FvM!

I used Active Serial Standard scheme in my situation. However, I didn't see this phenomena on the platform of the Altera Cyclone 3 starter board, in which Cyclone 3c25 F324 is used. The starter board use AP scheme instead of AS scheme. May I guess that the phenomena can only exist in AS scheme?

Regards

hustzq