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AT91RM9200 "Could not stop arm device"

Bob Smith

We have made a change to the reset circuit on our AT91RM9200 based board so the reset pulse is now 1.3 seconds. Unfortunately, now attempts to download or debug generate the error
"ULINK - ARM ERROR"
"Could not stop ARM Device. Please check the JTAG cable."

By removing a cap, we can reduce the reset pulse to 650 ms and the JTAG error goes away but then we end up with the board not resetting about 50% of the time.

Any suggestions?

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