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FM22LD16-55-BG データシート(PDF) 6 Page - Cypress Semiconductor

部品番号 FM22LD16-55-BG
部品情報  4Mbit F-RAM Memory
Download  14 Pages
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メーカー  CYPRESS [Cypress Semiconductor]
ホームページ  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM22LD16-55-BG データシート(HTML) 6 Page - Cypress Semiconductor

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FM22LD16 - 256Kx16 FRAM
Rev. 3.0
Oct. 2012
Page 6 of 14
Normal Memory
Operation
Read 24555h?
Read 3AAAAh?
Any other
operation
Read 02333h?
Read
1CCCCh?
Read 000FFh?
Read 3EF00?
Hold Data Byte
Write 1CCCC?
Data
Complement?
y
n
n
n
n
n
y
y
y
y
y
n
y
Write 3AAAA?
y
Write 0FF00?
y
n
Read 00000?
Enter new write
protect settings
n
Read 1AAAA?
Write 1CCCC?
y
Drive write protect
data out
Read 00000?
n
y
n
Change Write Protect
Settings
Read Write Protect
Settings
Sequence Detector
Figure 2. Write-Protect State Machine
For example, the following sequence write-protects addresses from 18000h to 27FFFh (sectors 3 & 4):
Address
Data
Read
24555h
-
Read
3AAAAh
-
Read
02333h
-
Read
1CCCCh
-
Read
000FFh
-
Read
3EF00h
-
Write 3AAAAh
18h
; bits 3 & 4 = 1
Write 1CCCCh
E7h
; complement of 18h
Write 0FF00h
-
; Data is don’t care
Read
00000h
-
; return to Normal Operation


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