#######################################
# PS 5 Fill Level - PS_DUMP
# Indentify start of next read address (either last read or start of PS)
if NCDD0AF9.raw < 1 then
   # This PS has not been read
   #
   if NCDD0AFC.raw < 1 then
        # Nor has it been written to - use the PS start address
        VAR_PS5_ReadPtr :=  NCDD0AF8.raw;
   else
       # There's a valid packet though, use the FVPP
   	VAR_PS5_ReadPtr :=  NCDD0AFC.raw;
   endif;
else
  # A valid playback pointer exists - use that
  VAR_PS5_ReadPtr := NCDD0AF9.raw;
endif;
#
# Get write address
VAR_PS5_WritePtr := NCDD0AFB.raw;
#
# Difference between them is the amount of unread data
if VAR_PS5_WritePtr >= VAR_PS5_ReadPtr then
   VAR_PS5_UnreadBytes := VAR_PS5_WritePtr - VAR_PS5_ReadPtr;
else
   VAR_PS5_UnreadBytes := (NCDD0AF7.raw + VAR_PS5_WritePtr) - VAR_PS5_ReadPtr; 
endif;
#
# Return amount of data stored in this packet store
return (VAR_PS5_UnreadBytes);