#######################################
# PS 6 Fill Level - PS_REPORTS
# Indentify start of next read address (either last read or start of PS)
if NCDD0AG9.raw < 1 then
   # This PS has not been read
   #
   if NCDD0AGC.raw < 1 then
        # Nor has it been written to - use the PS start address
        VAR_PS6_ReadPtr :=  NCDD0AG8.raw;
   else
       # There's a valid packet though, use the FVPP
   	VAR_PS6_ReadPtr :=  NCDD0AGC.raw;
   endif;
else
  VAR_PS6_ReadPtr := NCDD0AG9.raw;
endif;
#
# Get write address
VAR_PS6_WritePtr := NCDD0AGB.raw;
#
# Difference between them is the amount of unread data
if VAR_PS6_WritePtr >= VAR_PS6_ReadPtr then
   VAR_PS6_UnreadBytes := VAR_PS6_WritePtr - VAR_PS6_ReadPtr;
else
   VAR_PS6_UnreadBytes := (NCDD0AG7.raw + VAR_PS6_WritePtr) - VAR_PS6_ReadPtr; 
endif;
#
# Return amount of data stored in this packet store
return (VAR_PS6_UnreadBytes);