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FM20L08 データシート(PDF) 6 Page - List of Unclassifed Manufacturers

部品番号 FM20L08
部品情報  1Mbit Bytewide FRAM Memory - Extended Temp
Download  14 Pages
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メーカー  ETC1 [List of Unclassifed Manufacturers]
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FM20L08 データシート(HTML) 6 Page - List of Unclassifed Manufacturers

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FM20L08 - Extended Temp.
Rev. 1.4
Oct. 2005
Page 6 of 14
Normal Memory
Operation
Read 05555h?
Read
1AAAAh?
Any other
operation
Read 03333h?
Read
1CCCCh?
Read 100FFh?
Read 0FF00?
Hold Data Byte
Write 1CCCC?
Data
Complement?
y
n
n
n
n
n
y
y
y
y
y
n
y
Write 1AAAA?
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 00000h to 07FFFh and 10000h to 13FFFh
(sectors 0, 1 & 4):
Address
Data
Read
05555h
-
Read
1AAAAh
-
Read
03333h
-
Read
1CCCCh
-
Read
100FFh
-
Read
0FF00h
-
Write 1AAAAh
13h
; bits 0, 1, 4 = 1
Write 1CCCCh
ECh
; complement of 13h
Write 0FF00h
-
; Data is don’t care
Read
00000h
-
; return to Normal Operation


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