{TAIL ~ A hand shake type control circuit} for controlling a data transfer circuit according to the status of {HEAD ~ a data transfer request signal} 
{ TAIL ~ A hand shake type control circuit } for controlling a data transfer circuit according to the status of { HEAD ~ a data transfer request signal }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD