Motorola MVME162 manual Local Bus Memory Map, Normal Address Range

Memory Maps 1

Local Bus Memory Map

The local bus memory map is split into different address spaces by the transfer type (TT) signals. The local resources respond to the normal access and interrupt acknowledge codes.

Normal Address Range

The memory map of devices that respond to the normal address range is shown in the following tables. The normal address range is defined by the Transfer Type (TT) signals on the local bus. On the MVME162, Transfer Types 0, 1, and 2 define the normal address range. Table 1-3 is the entire map from $00000000 to $FFFFFFFF. Many areas of the map are user-programmable, and suggested uses are shown in the table. The cache inhibit function is programmable in the MC68xx040 MMU. The onboard I/O space must be marked cache inhibit and serialized in its page table. Table 1-4 further defines the map for the local I/O devices.

Table 1-3. Local Bus Memory Map

				Software
Address Range	Devices Accessed	Port Width	Size	Cache	Note(s)
				Inhibit
Programmable	DRAM on board	D32	1MB-4MB	N	2
Programmable	SRAM	D32	128KB-	N	2
			2MB
Programmable	VMEbus A32/A24	D32/D16	--	?	4
Programmable	IP a Memory	D32-D8	64KB-8MB	?	2, 4
Programmable	IP b Memory	D32-D8	64KB-8MB	?	2, 4
Programmable	IP c Memory	D32-D8	64KB-8MB	?	2, 4
Programmable	IP d Memory	D32-D8	64KB-8MB	?	2, 4
$FF800000 - $FF9FFFFF	Flash/PROM	D32	2MB	N	1, 5
$FFA00000 - $FFBFFFFF	PROM/Flash	D32	2MB	N	6
$FFC00000 - $FFCFFFFF	not decoded	--	1MB	N	7
$FFD00000 - $FFDFFFFF	not decoded	--	1MB	N	7
$FFE00000 - $FFE7FFFF	SRAM default	D32	512KB	N	--
$FFE80000 - $FFEFFFFF	not decoded	--	512KB	N	7
$FFF00000 - $FFFEFFFF	Local I/O	D32-D8	878KB	Y	3
$FFFF0000 - $FFFFFFFF	VMEbus A16	D32/D16	64KB	?	2, 4

MVME162IG/D2 1-21