performing {HEAD ~ calibration} on flex input output signals on a first cell processor of {TAIL ~ said plurality} of cell processors and said first input output controller of said plurality of input output controllers, 
performing { HEAD ~ calibration } on flex input output signals on a first cell processor of { TAIL ~ said plurality } of cell processors and said first input output controller of said plurality of input output controllers ,
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH