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Strange bf531 jtag problem

Question asked by mellis on Jul 12, 2012

Hey i am working some hardware containing the bf531 chip and i have been trying to get the jtag port working for a couple days now. It seems that the TDO pin has somehow been disabled as all i can really see is a 9ms pulse that seems to ring a lot. Is there any way the pin could have been disabled in software?

 

I have included a screen dump of the logic analyzer output.

 

Hope someone can help, Matt.

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