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FM25040B-GTR 数据表(PDF) 8 Page - Cypress Semiconductor

部件名 FM25040B-GTR
功能描述  4Kb Serial 5V F-RAM Memory
Download  14 Pages
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制造商  CYPRESS [Cypress Semiconductor]
网页  http://www.cypress.com
标志 CYPRESS - Cypress Semiconductor

FM25040B-GTR 数据表(HTML) 8 Page - Cypress Semiconductor

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FM25040B - 4Kb 5V SPI F-RAM
Document Number: 001-86145 Rev. *A
Page 8 of 14
Figure 9. Memory Write
Figure 10. Memory Read
Endurance
Internally, a F-RAM operates with a read and restore
mechanism. Therefore, endurance cycles are applied
for each access: read or write. The
F-RAM
architecture is based on an array of rows and
columns. Each access causes a cycle for an entire
row. In the FM25040B, a row is 64 bits wide. Every
8-byte boundary marks the beginning of a new row.
Endurance can be optimized by ensuring frequently
accessed
data
is
located
in
different
rows.
Regardless, F-RAM read and write endurance is
effectively unlimited at the 20MHz clock speed.
Even at 2000 accesses per second to the same row, 15
years time will elapse before 10
12 endurance cycles
occur.
0
1
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6
7
0
1
2
3
4
5
0
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4
5
6
7
op-code
0
0
0
0
A
0
1
1
MSB
Byte Address
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6
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4
3
2
CS
SCK
SI
SO
1
6
0
7
LSB
MSB
LSB
Data Out
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Hi-Z
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0
LSB
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op-code
0
0
0
0
A
0
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0
MSB
Byte Address
7
6
5
4
3
2
CS
SCK
SI
SO
1
6
0
7
LSB MSB
LSB
Data
7
6
5
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3
2
1
0
0
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Hi-Z


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