...reduce the JTAG TCK frequency?

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Paul Curtis

• July 09, 2009 12:46

How do I reduce the JTAG clock frequency?

 

If you are experiencing unreliable program download or debugging over JTAG it is a good idea to try reducing the JTAG clock frequency.

If you are using an ARM CrossConnect, a Wiggler or an FT2232 JTAG device you can reduce the clock frequency by increasing the JTAG Clock Divider target property (the default setting is 1).

If you are using an ARM CrossConnect you can also enable adaptive clocking by setting the Adaptive Clocking target property to Yes. This mode uses the RTCK signal to dynamically control the JTAG clock frequency.

If you are using a J-Link you can alter the clock frequency by setting the Speed target property (the default setting is 4000).

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  Ben Clewett

  • March 12, 2012 16:32

  This may be the solution to a problem I have.  However I can't find this option anywhere on the menu system of my CrossStudio 2.0.11?

  Regards, Ben.

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  Paul Curtis

  • March 12, 2012 17:12

  It is not in the menu system; it is in the properties of the target interface you are using.  Select the target interface in the targets window, then alter the properties in the properties window.

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