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參數(shù)資料
| 型號： | MAR31751FXXXX |
| 廠商： | DYNEX SEMICONDUCTOR LTD |
| 元件分類： | 存儲控制器/管理單元 |
| 英文描述： | 16-BIT, 256 PAGES, MEMORY MANAGEMENT UNIT, QFP68 |
| 封裝： | QFP-68 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大小： | 166K |
| 代理商： | MAR31751FXXXX |
MA31751
4/18
AS[0:3]
A[0:15]
EA[3:10]
A[4:15]
PB[0:3]
AS[0:3]
A[0:15]
EA[0:10]
A[4:15]
1750A
Addressing
Logical
Physical
1750B
Addressing
Logical*
Physical
1750A Extended Physical Address [0:19]
1750B Extended Physical Address [0:22]
EA3
A4
A15
AS0
AS3 A0
PA0
PA19
EA10
A15
PA0
PA22
A15
A4
EA10
EA0
PB0
PB3
AS3
AS0
A15
A0
* There are 16M words of logical address in 1750B. The 16MWord
logical to 8MWord physical mapping is user defined.
Figure 4: Extended Address Mapping in 1750A/B Mode
Figure 5: MA31751 Selection Chart for Varying Memory Requirements
Addressable
Physical
Memory
Addressable
Logical
Memory
Is BPU
Protection
Required?
Mode
Number of
MMUs
Number of
BPUs
Number of
MA31751s
Required
64KW
NO
A
0
1MW
NO
A
1
0
1
64KW
YES
A
0
1
1MW
YES
A
1
64KW
NO
B
0
8MW
1MW
NO
B
1
0
1
8MW
2MW
NO
B
2
0
2
8MW
4MW
NO
B
4
0
4
8MW
NO
B
8
0
8
8MW
16MW
NO
B
16
0
16
64KW
YES
B
0
1
8MW
1MW
YES
B
1
8
8MW
2MW
YES
B
2
8
8MW
4MW
YES
B
4
8
8MW
YES
B
8
8MW
16MW
YES
B
16
8
16
Notes: 1. Memory is specified in terms of addressable instruction space.
2. It is assumed that the whole of the physical address space is used in 1750B - if this is not the
case the number of MA31751 chips may be reduced.
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