An internal signal or signals are written to {HEAD ~ a serially connected memory} in {TAIL ~ the dedicated diagnostic data port} 
An internal signal or signals are written to { HEAD ~ a serially connected memory } in { TAIL ~ the dedicated diagnostic data port }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL