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Altera_Forum
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13 years ago

I/O states in Cyclone III in JTAG mode

Hello all, In Altera's application notes it is specified that during JTAG mode all I/O pins are tristated. It is sometimes mentioned that the weak pull ups are enabled when the I/O pins are t...
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Altera_Forum
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13 years ago

The description is in the device handbook boundary scan chapter.

It's said, said the weak pull-ups are only active, if the fpga has been configured before activating bst mode for those pins that enable weak pull-up in the configuration.

I think that's pretty clear.