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