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Altera_Forum
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18 years ago

will Cyclone III work with unconected VCCA PLL ??

I actually made e board already and didn't connected thous VCCA PLL pins and now my board don't work (I can't program it and software all time is saying "can't access JTAG chain" is that because...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
18 years ago

Hello,

the simple answer is: cyclone iii won't work without vcca supply. As the manual clarifies, the 2.5v vcca supply, also different from Cyclone II must be present as well as the core supply to enable the configuration and boundary scan JTAG circuit.

Regards,

Frank