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FM25640 датащи(PDF) 8 Page - Ramtron International Corporation

номер детали FM25640
подробное описание детали  64Kb FRAM Serial Memory
PDF  13 Pages
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производитель  RAMTRON [Ramtron International Corporation]
домашняя страница  http://www.ramtron.com
Logo RAMTRON - Ramtron International Corporation

FM25640 датащи(HTML) 8 Page - Ramtron International Corporation

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FM25640 - Automotive Temp.
Rev. 3.0
July 2007
8 of 13
0
1
2
345
67
0
1
2
34
5
34
5
6
7
0
1
2
345
6
7
op-code
0
0
0
0
0
0
1
0
MSB
13-bit Address
X
X
X
121110
4
3
2
1
0
7
6
5
4
3
2
1
0
LSB MSB
LSB
CS
SCK
SI
SO
Data
Figure 9. Memory Write
0
1
2
34567
0
1
2
34
5
3
4
567
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34567
op-code
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0
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MSB
13-bit Address
X
X
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12 11 10
43
210
76
54321
0
LSB MSB
LSB
CS
SCK
SI
SO
Data
1
Figure 10. Memory Read
Endurance
Internally, a FRAM operates with a read and restore
mechanism
similar
to
a
DRAM.
Therefore,
endurance cycles are applied for each access: read or
write. The FRAM architecture is based on an array of
rows and columns. Each access causes a cycle for an
entire row. Therefore, data locations targeted for
substantially differing numbers of cycles should not
be located within the same row. In the FM25640,
there are 2048 rows each 32 bits wide. Each 4 bytes
in the address mark the beginning of a new row.
Regardless, FRAM read and write endurance is
effectively unlimited at the 4 MHz clock speed.
Even at 2000 accesses per second to the same row, 15
years time will pass before 10
12 endurance cycles
occur.



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