Bus Mode; Figure 3.1.3A Access Areas And Physical Addresses In Each Bus Mode - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

3.1 Memory Access Modes

3.1.3 Bus Mode

Figure 3.1.3a shows correspondence between the access areas and physical addresses for each bus
mode.
FFFFFF
H
Address #1
FE0000
H
010000
H
Address #2
004000
H
002000
H
Address #3
000100
H
0000C0
H
000000
H
.
Device
MB90583
MB90F583
MB90V580
Note:
If ROM mirroring function is not wanted, please refer to Chapter 22, ROM Mirroring Module.
Note:
The high-order portion of bank 00 gives the image of the FF bank ROM to make the small model of the
C compiler effective. Since the low-order 16 bits are the same, the table in ROM can be referenced with-
out using the far specification in the pointer declaration.For example, an attempt to access 00C000
accesses the value at FFC000
Note:
The ROM area in bank FF exceeds 48 Kbytes, and its entire image cannot be shown in bank 00.
Note:
With the MB90F583 and MB90583, the image between FF4000H and FFFFFF
while the image between FE0000

Figure 3.1.3a Access areas and physical addresses in each bus mode

34 Chapter 3: Memory
ROM
ROM
(FF bank image) (FF bank image)
RAM
I/O
Single chip Internal ROM,
external bus
(with ROM mirror
function)
(with ROM mirror
Address #1
FE0000H
FE0000H
(FE0000H)
in ROM.
H
and FF3FFF
H
ROM
ROM
RAM
RAM
I/O I/O
External ROM,
external bus
function)
Address #2
004000H
004000H
004000H
is visible only in bank FE or FF
H
: No access
: Internal access
: External access
Address #3
001900H
001900H
001900H
is visible in bank 00,
H
MB90580 Series
H