User’s Manual U11969EJ3V0UM00
57
CHAPTER 3 CPU FUNCTIONS
3.4.2 Image (Virtual Address Space)
The core CPU supports 4 Gbytes of “virtual” addressing space, or 256 memory blocks, each containing 16-Mbyte
memory locations. In actuality, the same 16-Mbyte block is accessed regardless of the values of bits 31 to 24 of the
CPU address. Figure 3-5 shows the image of the virtual addressing space.
Because the higher 8 bits of a 32-bit CPU address are ignored and the CPU address is only seen as a 24-bit external
physical address, the physical location XX000000H is equally referenced by multiple address values 00000000H,
010000000H, 02000000H... through FF000000H.
Figure 3-5. Image on Address Space
FFFFFFFFH
FF000000H
FEFFFFFFH
Image
CPU address space
Image
Image
Image
Image
FE000000H
FDFFFFFFH
02000000H
01FFFFFFH
01000000H
00FFFFFFH
00000000H
Physical address space
Peripheral I/O
Internal RAM
External memory
Internal ROM
XXFFFFFFH
XX000000H
Содержание V854 UPD703006
Страница 2: ...2 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 22: ...22 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 80: ...80 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 134: ...134 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 156: ...156 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 294: ...294 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 320: ...320 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 324: ...324 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 336: ...336 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 376: ...376 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 382: ...382 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 394: ...394 User s Manual U11969EJ3V0UM00 MEMO ...
Страница 396: ...396 User s Manual U11969EJ3V0UM00 MEMO ...