The programmable device is programmed to include four processing engines, each of which performs a single MD5 stage having {TAIL ~ four MD5 operations} performed by {HEAD ~ the MD5 stage} 
The programmable device is programmed to include four processing engines , each of which performs a single MD5 stage having { TAIL ~ four MD5 operations } performed by { HEAD ~ the MD5 stage }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD