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17.5 Memory Mapping of CompactFlash Card
(1) Memory window
In the V
4181, memory windows can be placed at any address in the ISA memory space. The start address of a
R
memory window is output without modification to the V
programmable chip select, LCD chip select, etc. must not be specified as a memory window.
The CompactFlash memory space is 2 KB and the minimum memory window size is 4 KB. Accordingly, when
using CompactFlash with the V
Mapping starts from the LSB. The remaining part of the memory window becomes a mirror area occupying the
lower 2 KB.
V
R
ISA memory space (internal)
(64 MB)
0x13FF FFFF
0x1sss s000
Memory window m
0x1rrr r000
0x1qqq q000
Memory window n
0x1ppp p000
0x0000 0000
Remark
m, n = 0 to 4
p, q, r, s = don't care
350
CHAPTER 17 COMPACTFLASH CONTROLLER (ECU)
4181, the card's entire memory space is mapped to a single memory window.
R
Figure 17-2. Mapping of CompactFlash Memory Space
4181
Space specified via ADD pins
0x3F FFFF
0x00 0000
User's Manual U14272EJ3V0UM
4181's ADD pins.
R
V
4181
R
(4 MB)
Memory window m
Memory window n
However, spaces used for
CompactFlash card
Common memory space
Attribute memory space
(2 KB)
0x7FF
0x000
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