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MartinMaa's avatar
MartinMaa
Icon for Occasional Contributor rankOccasional Contributor
2 years ago
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JTAG PULL UP/DOWN RESISITER

Hi, I am writing to ask a question about the pull-up and pull-down resistors used in JTAG signals. If an FPGA has internal pull-up resistors, do I need to add these resistors? If I do need to add th...
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  • NurAiman_M_Intel's avatar
    NurAiman_M_Intel
    2 years ago

    Hi,


    Yes, FvM is correct. Diodes and capacitor are more critical. The position of the resistor in your design should be fine.


    Regards,

    Aiman


MartinMaa's avatar
MartinMaa
Icon for Occasional Contributor rankOccasional Contributor
2 years ago

Thank you for your reply.

Since my PCB is very small, only 36mmX36mm, there are some difficulties in placing the components.

If the distance is as shown in the figure, will there be a problem? Or is there a maximum allowable length?

482mil (12mm)

FvM's avatar
FvM
Icon for Super Contributor rankSuper Contributor
2 years ago
Regarding resistors, I doubt there's a strict close to FPGA requirement because resistance is large multiple of trace impedance. Position of capacitors is more critical, a few centimeters don't matter though.