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