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Q: JTAG chain detection does not work with Atmel AVR
Answer:
On some ATmega devices (i.e. Mega128L) IDCODE masks the data from TDI input The JTAG instruction IDCODE is not working correctly. Data to succeeding devices are replaced by all-ones during Update-DR.
If the Device IDs of all devices in the boundary scan chain are to be captured
simultaneously, the ATmega128 must be the fist device in the chain.
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SECONS Ltd. is not in any way connected with integrated circuit manufacturers and there is no any type of authorization, association or affiliation between SECONS and integrated circuit manufacturers. All information present in this FAQ is provided for informational purposes only, on "as-is" basis, and is intended to be useful and informative for SECONS customers.