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ULINK: JTAG PULL-UP RESISTORS


Information in this article applies to:

  • ULINK - All Versions
  • ULINK2 - All Versions

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.

MORE INFORMATION

FORUM THREADS

The following Discussion Forum threads may provide information related to this topic.

Last Reviewed: Monday, July 2, 2007


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