Rom Mirroring Register (Romm) - Fujitsu MB96300 series Hardware Manual

MB96300 Super Series Hardware Manual
32.2

ROM Mirroring Register (ROMM)

The ROM Mirroring register (ROMM) configures all functions of the ROM mirroring
module:
- the mirrored ROM bank
- the size of the mirrored ROM
- the ROM mirror enable
■ ROM mirroring register (ROMM)
7 6
Address:
0003AE
BS3 BS2
H
R/W R/W R/W R/W
R/W : Readable and writable
X : undefined value
: Initial value
5 4 3 2 1 0
SZ1 SZ0 MI
BS1 BS0 -
- R/W R/W R/W
CHAPTER 32 ROM/RAM MIRRORING MODULE
Initial value
1 1 1 1 X 1 1 1
B
bit0
MI ROM Mirror enable
0 ROM-Mirroring function is disabled
1 ROM-Mirroring function is enabled
bit2 bit1
SZ1 SZ0 Mirror size selection
0 0 8kB ROM mirrored
0 1 16kB ROM mirrored
1 0 24kB ROM mirrored
1 1 32kB ROM mirrored
bit3
- undefined
read value is undefined
write always '0'
bit[7:4]
BS[3:0] mirrored Bank selection bit
part of
0000 Bank F0 is mirrored
H
part of
.... Bank Fx is mirrored
1111 part of Bank FF is mirrored
H
833