The mutex registers can be configured as {HEAD ~ sets} of {TAIL ~ mutex request registers} and mutex release registers 
The mutex registers can be configured as { HEAD ~ sets } of { TAIL ~ mutex request registers } and mutex release registers
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH