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Rev. 5.00, 09/03, page 314 of 760
When the entire 32-Mbyte memory space is used as IC memory card interface space, the common
memory/attribute memory switching signal REG is generated using a port, etc. If 16 Mbytes or
less of memory space is sufficient, using 16 Mbytes of memory space as common memory space
and 16 Mbytes as attribute memory space enables the A24 pin to be used for the REG signal.
I/O space
I/O space
I/O space
Area 5: H'14000000
Area 5: H'16000000
Area 6: H'18000000
Area 6: H'1A000000
Area 5: H'14000000
Area 5: H'15000000
Area 5: H'16000000
H'17000000
Area 6: H'18000000
Area 6: H'19000000
Area 6: H'1A000000
H'1B000000
Attribute memory
Common memory
Attribute memory
Common memory
I/O space
Up to 16-Mbyte capacity (REG = A24)
32-Mbyte capacity (REG = I/O port)
Common memory/
attribute memory
Common memory/
attribute memory
Figure 10.36 PCMCIA Space Allocation