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FM25640B-GTR Arkusz danych(PDF) 8 Page - Cypress Semiconductor

Numer części FM25640B-GTR
Szczegółowy opis  64Kb Serial 5V F-RAM Memory
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Producent  CYPRESS [Cypress Semiconductor]
Strona internetowa  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM25640B-GTR Arkusz danych(HTML) 8 Page - Cypress Semiconductor

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FM25640B - 64Kb 5V SPI F-RAM
Rev. 3.0
Jan. 2012
8 of 13
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Figure 9. Memory Write
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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 FM25640B, 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.


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