FNX6809 Manuals: Difference between revisions

Revision as of 20:18, 31 May 2024


Address	R/W	Name	7	6	5	4	3	2	1	0
$FFA0	RW	MMU_MEM_CTRL	-	-	EDIT_LUT		-	-	ACT_LUT
$FFA1	RW	MMU_IO_CTRL	-	-	-	-	-		$FFF0-$FFFF Enable	$FD00-$FDFF Enable

There are 4 MLUTs (MMU Lookup Tables).

ACT_LUT these two bits specify which MLUT (0–3) is used to translate CPU bus address to system bus addresses.

EDIT_LUT these two bits will specify which MLUT (0 - 3) is being edited and will appear in memory addresses $FFA8-$FFAF.

These locations are defined in nitros9/defs/f256.d:

MMU_MEM_CTRL equ $FFA0

MMU_IO_CTRL equ $FFA1

MMU_SLOT_0 equ $FFA8 $0000-$1FFF

MMU_SLOT_1 equ $FFA9 $2000-$3FFF

MMU_SLOT_2 equ $FFAA $4000-$5FFF

MMU_SLOT_3 equ $FFAB $6000-$7FFF

MMU_SLOT_4 equ $FFAC $8000-$9FFF

MMU_SLOT_5 equ $FFAD $A000-$BFFF

MMU_SLOT_6 equ $FFAE $C000-$DFFF

MMU_SLOT_7 equ $FFAF $E000-$FFFF

@@ Line 32: / Line 32: @@
 | -
 | -
+|
 |$FFF0-$FFFF
 Enable
-| colspan="2" |$FD00-$FDFF
+|$FD00-$FDFF
 Enable
 |}
@@ Line 42: / Line 43: @@
 '''ACT_LUT''' these two bits specify which MLUT (0–3) is used to translate CPU bus address to system bus addresses.
-'''EDIT_LUT''' these two bits will specify which MLUT (0 - 3) is being edited and will appear in memory addresses 0x0008–0x0010.
+'''EDIT_LUT''' these two bits will specify which MLUT (0 - 3) is being edited and will appear in memory addresses $FFA8-$FFAF.
+These locations are defined in nitros9/defs/f256.d:
+MMU_MEM_CTRL    equ       $FFA0
+MMU_IO_CTRL        equ       $FFA1
+MMU_SLOT_0          equ       $FFA8               $0000-$1FFF
+MMU_SLOT_1          equ       $FFA9               $2000-$3FFF
+MMU_SLOT_2          equ       $FFAA               $4000-$5FFF
+MMU_SLOT_3          equ       $FFAB               $6000-$7FFF
+MMU_SLOT_4          equ       $FFAC               $8000-$9FFF
+MMU_SLOT_5          equ       $FFAD               $A000-$BFFF
+MMU_SLOT_6          equ       $FFAE               $C000-$DFFF
+MMU_SLOT_7          equ       $FFAF               $E000-$FFFF
 == Memory Map ==