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參數資料
型號: MB91133
廠商: Fujitsu Limited
英文描述: 32-Bit RISC Microcontroller
中文描述: 32位RISC微控制器
文件頁數: 39/123頁
文件大小: 1362K
代理商: MB91133
MB91133/MB91F133
39
I
PERIPHERAL RESOURCES
1.
Bus Interface
The bus interface controls the interface with external memory and external I/O.
Bus Interface Characteristics
24-bit (16 MB) address output
16/8-bit bus width can be set.
Insertion of programmable “automatic memory wait” (maximum of 7 cycles)
Supports “little endian” mode
Unused addresses / data pins can be used as I/O ports.
Clock doubled should be used if the external bus exceeds 25 MHz. Bus speed is 1/2 of the CPU speed.
Areas
A total of six types of chip selection areas are prepared for the bus interface. The position of each area can be
randomly arranged per 64 KB at least using area selection registers (ASR1 to ASR 5) and area mask registers
(AMR1 to AMR 5) in an area of 4 GB. The area 0 is allocated to space outside the area specified by ASR1 to
ASR5. External areas other than 00010000
H
to 0005FFFF
H
are deemed area 0 on resetting.
There is no chip selection output pin so no setting is required. Setting it has no effect on usage.
Figure 4.1-1 shows an example in which areas 1 to 5 are arranged from 00100000
H
to 0014FFFF
H
in 64 KB
units. Also, Figure 4.1-2 shows an example in which area 1 is arranged as 00000000
H
to 0007FFFF
H
in 512 KB
and areas 2 to 5 are arranged as 00100000
H
to 004FFFFF
H
in 1-MB units.
00000000
H
00000000
H
00080000
H
000FFFFF
H
001FFFFF
H
002FFFFF
H
003FFFFF
H
004FFFFF
H
00080000
H
000FFFFF
H
0010FFFF
H
0011FFFF
H
0012FFFF
H
0013FFFF
H
0014FFFF
H
CS0 (1 Mbyte)
CS1 (512 K)
CS0 (512 K)
CS2 (1 Mbyte)
CS3 (1 Mbyte)
CS4 (1 Mbyte)
CS5 (1 Mbyte)
CS0
CS0
CS1 (64 Kbyte)
CS2 (64 Kbyte)
CS3 (64 Kbyte)
CS4 (64 Kbyte)
CS5 (64 Kbyte)
Figure 4.1-1
Area Arrangement Example 1
Figure 4.1-2
Area Arrangement Example 2
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