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JTAG IDCODE for ADSP-21469

Question asked by Steven.Martin on Jun 12, 2018
Latest reply on Jun 12, 2018 by Mullet

My product's manufacturing engineer reports that the IDCODE returned by all four of the ADSP-21469 chips in the JTAG scan chain are returning a value that is different from the expected value from the BSDL file.

 

Example failure message from the JTAG tester is below. The data is the same for the other 3 SHARCs in the chain.

IDCODE for Device U4801 in tap 1 FAILED
   Expected data: 00010000000010100010000011001011
   Measured data: 00000000000010100000000011001011

 

Given that we've built over 200 of these boards with the same JTAG sequence, the failure is a surprise. Is the IDCODE shown in the measured data valid for an different version of the silicon than we had been getting? Which version?

 

I don't think it's a hardware issue since the IDCODEs for the other 7 devices in the JTAG chain were valid. I'm not sure where to look and would appreciate any suggestions.

 

Regards,

Steven

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