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Table 2.1
Logical Address Space
Address
Range
Name
Mode
Description
H’00000000 to
H’7FFFFFFF
P0/U0
Privileged/user mode
2-Gbyte physical space, cacheable, address
translatable
In user mode, only this address space can
be accessed.
H’80000000 to
H’9FFFFFFF
P1
Privileged mode
0.5-Gbyte physical space, cacheable
H’A0000000 to
H’BFFFFFFF
P2
Privileged mode
0.5-Gbyte physical space, non-cacheable
H’C0000000 to
H’DFFFFFFF
P3
Privileged mode
0.5-Gbyte physical space, cacheable,
address translatable
H’E0000000 to
H’FFFFFFFF
P4
Privileged mode
0.5-Gbyte control space, non-cacheable
2.2.2
External Memory Space
The LSI uses 29 bits of the 32-bit logical address to access external memory. In this case, 0.5-
Gbyte of external memory space can be accessed. The external memory space is managed in area
units. Different types of memory can be connected to each area, as shown in figure 2.2. For
details, please refer to section 7, Bus State Controller (BSC). In addition, area 1 in the external
memory space is used as an on-chip I/O space where most of this LSI's on-chip module control
registers are mapped. *
1
Normally, the upper three bits of the 32-bit logical address are masked and the lower 29 bits are
used for external memory addresses.*
2
For example, address H'00000100 in the P0 area, address
H'80000100 in the P1 area, address H'A0000100 in the P2 area, and address H'C0000100 in the P3
area of the logical address space are mapped into address H'00000100 of area 0 in the external
memory space. The P4 area in the logical address space is not mapped into the external memory
address. If an address in the P4 area is accessed, an external memory cannot be accessed.
Notes: 1. To access an on-chip module control register mapped into area 1 in the external
memory space, access the address from the P2 area which is not cached in the logical
address space.
2. If the address translation unit is enabled, arbitrary mapping in page units can be
specified. For details, refer to section 3, Memory Management Unit (MMU).
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