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