A two wire dedicated diagnostic data port in an integrated circuit provides visibility for {HEAD ~ all internal functions} of {TAIL ~ the integrated circuit} 
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A two wire dedicated diagnostic data port in an integrated circuit provides visibility for { HEAD ~ all internal functions } of { TAIL ~ the integrated circuit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL