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Part Number: LMH6401EVM
Other Parts Discussed in Thread: LMH6401

From some reason I get no answer from EVB on the TDO line (using TI GUI )

the SDO line is "stack" at 1.2V and never response , When attach a scope probe the responses of all registers is 0x00 and without a probe return 0xFF at all registers 

it happened on 2 EVB (out of the box)