VPU functions in half duplex, and {HEAD ~ hardware modules} are shared between {TAIL ~ encode/decode modes} 
are shared between
VPU functions in half duplex , and { HEAD ~ hardware modules } are shared between { TAIL ~ encode / decode modes }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL