Registers And Register Details; Rom Mirror Function Select Register; Figure 22.3A Register Of Rom Mirroring Module - Fujitsu F2MC-16LX MB90580 Series Hardware Manual

22.3 Registers and Register Details

22.3 Registers and Register Details

ROM Mirror Function Select Register

Address : 0006F
Read/write
Initial value
22.3.1 ROM Mirror Function Select Register
ROM Mirror Function Select Register
Address : 0006F
Read/write
Initial value
Note: Do not access this register when the addresses 004000
accessed.
[bit 8] : MI
The ROM data in the FF bank can also be found in the 00 bank when ' 1' is written to this bit. However,
such as memory mapping will not be done when this bit is written to ' 0'. This bit is write only.
The memory during single chip mode and during internal ROM external bus mode will be as shown
below.
Note: Only FF4000~FFFFFF is mirrorred to 004000~00FFFF when ROM mirroring functing
is activated. Therefore, addresses FFF000~FF3FFF will not be mirrorred to 00 bank.
300 Chapter 22: ROM Mirroring Module
15 14
— —
H
(–)
(–)
(–)
(–)

Figure 22.3a Register of ROM Mirroring Module

15 14 13
H — — —
(–) (–)
(–)
(–) (–)
(–)
MB90583
Address 1 FE0000
Address 2 001900
13 12 11
— — —
(–) (–) (–)
(–) (–) (–)
12 11
— —
(–) (–)
(–) (–)
MB90F583
FE0000
H H
001900
H H
10 9 8
—
— MI
(–)
(–) (W)
(–) (–) (1)
9 8
10
—
— MI
(–) (–) (W)
(–) (–) (1)
~00FFFF is being
H H
MB90V580
FE0000
H
001900
H
Bit number
ROMM
Bit number
ROMM
MB90580 Series