Operation; Area Division - Hitachi H8/3006 Hardware Manual

6.3

Operation

6.3.1

Area Division

The external address space is divided into areas 0 to 7. Each area has a size of 128 kbytes in the 1-
Mbyte modes, or 2-Mbytes in the 16-Mbyte modes. Figure 6.2 shows a general view of the
memory map.
H' 00000
Area 0 (128 kbytes)
H' 1FFFF
H' 20000
Area 1 (128 kbytes)
H' 3FFFF
H' 40000
Area 2 (128 kbytes)
H' 5FFFF
H' 60000
Area 3 (128 kbytes)
H' 7FFFF
H' 80000
Area 4 (128 kbytes)
H' 9FFFF
H' A0000
Area 5 (128 kbytes)
H' BFFFF
H' C0000
Area 6 (128 kbytes)
H' DFFFF
H' E0000 Area 7 (128 Mbytes)
H' FFFFF
(a) 1-Mbyte modes (modes 1 and 2)
Figure 6.2 Access Area Map for Each Operating Mode
Chip select signals (CS
area are selected in ABWCR, ASTCR, WCRH, and WCRL.
In 16-Mbyte mode, the area division units can be selected with the RDEA bit in BCR.
to CS
) can be output for areas 0 to 7. The bus specifications for each
0 7
H' 000000
Area 0 (2 Mbytes)
H' 1FFFFF
H' 200000
Area 1 (2 Mbytes)
H' 3FFFFF
H' 400000
Area 2 (2 Mbytes)
H' 5FFFFF
H' 600000
Area 3 (2 Mbytes)
H' 7FFFFF
H' 800000
Area 4 (2 Mbytes)
H' 9FFFFF
H' A00000
Area 5 (2 Mbytes)
H' BFFFFF
H' C00000
Area 6 (2 Mbytes)
H' DFFFFF
H' E00000 Area 7 (2 Mbytes)
H' FFFFFF
(b) 16-Mbyte modes (modes 3 and 4)
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