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AT91SAM7A2-AI датащи(PDF) 49 Page - ATMEL Corporation

номер детали AT91SAM7A2-AI
подробное описание детали  AT91 ARM Thumb-based Microcontrollers
PDF  369 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT91SAM7A2-AI датащи(HTML) 49 Page - ATMEL Corporation

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49
PRELIMINARY
AT91SAM7A2
6021A–ATARM–07/04
AMC Memory Control Register
Name:
AMC_MCR
Access:
Read/Write
Base Address:
0x024
• DRP: Data Read Protocol
0: standard read protocol for all external memory devices enabled.
1: early read protocol for all external memory devices enabled.
• ALE[2:0]: Address Line Enable
These bits indicate the number of valid chip select lines.
31
30
29
28
27
26
25
24
––
–––
––
–
23
22
21
20
19
18
17
16
––
–––
––
–
15
14
13
12
11
10
9
8
––
–––
––
–
76
543
21
0
–
–
–
DRP
–
ALE[2:0]
ALE2
ALE1
ALE0
Valid Address Bits
Maximum Addressable Space
per Chip Select Line
Valid Chip Select
0
x
x
ADD[20:0]
2 Mbytes
NCS[2:0]
1
0
x
ADD[20:0]
2 Mbytes
NCS[2:0]
1
1
0
ADD[20:0]
2 Mbytes
NCS[2:0]
1
1
1
ADD[19:0]
1 Mbytes
NCS[2:0], CS3



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