Hitachi SH7751 Hardware Manual page 137

H'7C00 2000 to H'7C00 2FFF (4 kB): Corresponds to RAM area 2
H'7C00 3000 to H'7C00 3FFF (4 kB): Corresponds to RAM area 2
H'7C00 4000 to H'7C00 4FFF (4 kB): Corresponds to RAM area 1
:
RAM areas 1 and 2 then repeat every 8 kbytes up to H'7FFF FFFF.
Thus, to secure a continuous 8-kbyte RAM area, the area from H'7C00 1000 to H'7C00 2FFF
can be used, for example.


When OC index mode is on (CCR.OIX = 1)
H'7C00 0000 to H'7C00 0FFF (4 kB): Corresponds to RAM area 1
H'7C00 1000 to H'7C00 1FFF (4 kB): Corresponds to RAM area 1
H'7C00 2000 to H'7C00 2FFF (4 kB): Corresponds to RAM area 1
:
H'7DFF F000 to H'7DFF FFFF (4 kB): Corresponds to RAM area 1
H'7E00 0000 to H'7E00 0FFF (4 kB): Corresponds to RAM area 2
H'7E00 1000 to H'7E00 1FFF (4 kB): Corresponds to RAM area 2
:
H'7FFF F000 to H'7FFF FFFF (4 kB): Corresponds to RAM area 2
As the distinction between RAM areas 1 and 2 is indicated by address bit [25], the area from
H'7DFF F000 to H'7E00 0FFF should be used to secure a continuous 8-kbyte RAM area.
An example of RAM use in the SH7751R is shown below.


SH7751-compatible-mode (CCR.EMODE = 0)
H'7C00 0000 to H'7C00 1FFF (8 kB): Corresponds to RAM area (entries 256 to 511)
H'7C00 2000 to H'7C00 3FFF (8 kB): Corresponds to RAM area (entries 256 to 511)
:
A shadow of the RAM area occurs every 8 kbytes up to H'7FFF FFFF.


Cache-double-mode (CCR.EMODE = 1)
The 8 kbytes of entries 256 to 511 in OC way 0 are used as RAM area 1, and the 8 kbytes of
entries 256 to 511 in OC way 1 are used as RAM area 2.
H'7C00 0000 to H'7C00 1FFF (8 kB): Corresponds to RAM area 1
H'7C00 2000 to H'7C00 3FFF (8 kB): Corresponds to RAM area 2
H'7C00 4000 to H'7C00 5FFF (8 kB): Corresponds to RAM area 1
H'7C00 6000 to H'7C00 7FFF (8 kB): Corresponds to RAM area 2
:
A shadow of the RAM area occurs every 16 kbytes up to H'7FFF FFFF.
Rev. 3.0, 04/02, page 98 of 1064
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