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Altera_Forum
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12 years ago

What kind of JTAG this board is using?

Hello, I'm following a tutorial PCB board for Cyclone 4. I'm using the design found here provided by one man has done it before: https://bitbucket.org/avakar/omicron_analyzer/src/00e2960f9...
Altera_Forum's avatar
Altera_Forum
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12 years ago

Cyclone IV has on-chip weak pull-up and pull-down resistors. They can be probably considered sufficient for unconnected JTAG pins. With PCB fan-out, the high impedance pins are prone to inteference pick-up. To be on the safe side, you should provide the suggested 1k resistors.