When {HEAD ~ the semiconductor memory device} is set to a specific mode for suppressing {TAIL ~ a power consumption}, the LVTTL is used for taking in an external signal 
When { HEAD ~ the semiconductor memory device } is set to a specific mode for suppressing { TAIL ~ a power consumption } , the LVTTL is used for taking in an external signal
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH