A protected memory circuit for use with an electronic data system includes a memory element such as a shift register, and memory control or lock {HEAD ~ means} to selectively control {TAIL ~ enablement} of the memory element for read/write operations 
to selectively control
A protected memory circuit for use with an electronic data system includes a memory element such as a shift register , and memory control or lock { HEAD ~ means } to selectively control { TAIL ~ enablement } of the memory element for read / write operations
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH