ATU Entry State =============== Used as the Entry State for ATU Load/Purge or Flush/Move operations and it is the resulting Entry State from ATU Get Next operations (GetNext is the only ATU operation supported in the devices). If theses equal to 0x0 then the atuOperation is a Purge or a Flush. If theses bits are not 0x0 then the atuOperation is a Load or a Move (a move atuOperation requires these bits to be 0x0F). On Get/Clear Violation Data atuOperation, theses bits return the Source Port ID(SPID) associated with the ATU violation that was just serviced. If SPID = 0xF the source of the violation was the CPU's register interface (i.e. the ATU was full during a CPU Load operation).