ARM Technical Support Knowledge Articles

JTAG PULL-UP RESISTORS

Applies to: ULINK USB-JTAG Debugger

Answer


Information in this article applies to:


QUESTION

The ULINK and ULINK2 User's Guides recommend using 100K pull-up resistors for JTAG signals TMS, TDI, TRST, and TCLK. But the Keil MCB2300 Evaluation Board uses 10K pull-up resistors, not 100K for those signals.

Which one is correct?

ANSWER

You may use either 10K or 100K resistors (or any value in between) as pull-ups for these JTAG signals. What's important is that you use them so they will keep the JTAG signals from floating when they are not connected to anything.

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Article last edited on: 2007-07-02 14:47:13

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