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| 型號： | V30MZ |
| 英文描述： | V30MZ(TM) Hardware (Preliminary) | User＇s Manual[01/2002] |
| 中文描述： | V30MZ（TM）硬件（初步）|用戶手冊[01/2002] |
| 文件頁數(shù)： | 34/89頁 |
| 文件大小： | 418K |
| 代理商： | V30MZ |
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CHAPTER 3 CPU FUNCTIONS
34
3.4 Logical Address and Physical Address
There are two kinds of memory space address; logical address and physical address.
The physical address means an address that directly corresponds to hardware. The V30MZ can access a 1 M-
byte memory space and so the range of a physical address value is 00000H to FFFFFH. A physical address is
generated every time the bus control unit (BCU) is started which fetches an instruction and transfers data, etc.
The logical address means an address used for addressing in the segment system.
3.4.1 Segment system
The segment means an address space in small units (MAX. 64 K bytes) which do not directly depend on program
creation.
Each segment consists of continuous memory and can be specified individually.
Physical addresses cannot be controlled directly in program creation in machine language. The V30MZ specifies
memory addresses in a segment system.
Addressing in the segment system uses the following two types of address.
Segment base address : Start address of segment (address in 1 M-byte memory space)
Offset address
: Address allocated to each segment
In the segment system, the segment base address is fixed as a reference point and only the offset address is
treated as an address in processing within each segment.
Figure 3-5. Conceptual Diagram of Segment System
FFFFFH
00000H
xxxxxH
Segment
FFFFH
(maximum)
0000H
Offset
address
Segment base address
Memory space
The segment base address is specified by the segment register.
The physical address is a sum of the segment base address and offset address. Figure 3-6 shows the
relationship between the segment register and offset address, and physical address.
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