Mapping Of And Access To Memory Space - Fujitsu MB90895 Series Hardware Manual

CHAPTER 3 CPU
3.1.1

Mapping of and Access to Memory Space

In MB90895 series, the single-chip mode can be set as a memory access modes.
I Memory Map for MB90895 Series
In MB90895 series, the internal address bus is output up to a width of 24 bits and the external address bus
is output up to a width of 24 bits; the external access memory can access up to the 16-MB memory space.
Figure 3.1-2 "Memory Map for MB90895 Series" shows the memory map when the ROM mirroring
function is enabled and disabled.
000000
H
0000C0
H
000100
H
Address #1
003900
H
004000
H
010000
H
FE0000
H
FF0000
H
FFE000
H
FFFFFF
H
*: In MB90F897/S, When the area of FE0000
FF0000
22
Figure 3.1-2 Memory Map for MB90895 Series
When ROM mirroring
function is enabled
Peripheral
RAM area
Register
Expanded I/O area
ROM area
(Image of FF Bank)
*
ROM area
ROM area
Products
MB90V495G
MB90F897/S
: internal access memory
: Access prohibited
to FFFFFF can be read.
H H
When ROM mirroring
function is disabled
Hardwired
reset vectors
Address #1
001900
H
000900
H
to FEFFFF is read, data of
H H
Peripheral
RAM area
Register
Expanded I/O area
*
ROM area
ROM area