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CHAPTER 32 ROM/RAM MIRRORING MODULE
32.1
Outline of ROM Mirroring Module
The ROM-Mirroring module maps the logical address (e.g. CPU address) of bank 00 to a
physical address in a selected ROM bank. The mirrored ROM size is configurable.
Unused ROM-Mirror area is used for mirroring RAM from bank 01.
■ Block diagram of ROM mirroring module
logical address space
(CPU, DMA)
address:
00:8000
- 00:FFFF
H
H
address:
00:0000
- 00:7FFF
H
H
Only ROM-addresses of the upper half of ROM banks F0
to bank 00
bank 01
is mirrored to bank 00
H
832
Figure 32.1-1 Block diagram of ROM mirroring module
ROM Mirroring
enable (ROMM:MI)
ROM-Mirroring
disabled
. The lower half of a ROM bank is never mirrored. If the ROM-Mirroring function is disabled,
H
.
H
MB96300 Super Series Hardware Manual
ROM-Mirroring
enabled
ROM Mirroring
configuration
ROMM:SZ[1:0]
ROMM:BS[3:0]
to FF
H
H
physical address space
bank FF
bank FE
bank FD
bank FC
bank F3
bank F2
bank F1
bank F0
bank 01
bank 00
(Fx:8000
to Fx:FFFF
) can be mirrored
H
H
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