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FM28V202-TGTR Datenblatt(PDF) 6 Page - Cypress Semiconductor

Teilenummer FM28V202-TGTR
Bauteilbeschribung  2Mbit (128Kx16)F-RAM Memory
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Hersteller  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

FM28V202-TGTR Datenblatt(HTML) 6 Page - Cypress Semiconductor

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FM28V202 - 128Kx16 F-RAM
Document Number: 001-86602 Rev. **
Page 6 of 18
requires an exact inversion of the data byte. A flow
chart of the entire write protect operation is shown in
Figure 2. The write-protect settings are nonvolatile.
The factory default: all blocks are unprotected.
Normal Memory
Operation
Read 12555h?
Read
1DAAAh?
Any other
operation
Read 01333h?
Read
0ECCCh?
Read 000FFh?
Read 1FF00?
Hold Data Byte
Write 0ECCC?
Data
Complement?
y
n
n
n
n
n
y
y
y
y
y
n
y
Write 1DAAA?
y
Write 0FF00?
y
n
Enter new write
protect settings
n
Read 1AAAA?
Write 0ECCC?
y
Drive write protect
data out
Read 00000?
n
y
n
Change Write Protect
Settings
Read Write Protect
Settings
Sequence Detector
Read 00000?
Figure 2. Write-Protect State Machine
For example, the following sequence write-protects addresses from 0C000h to 13FFFh (sectors 3 & 4):
Address
Data
Read
12555h
-
Read
1DAAAh
-
Read
01333h
-
Read
0ECCCh
-
Read
000FFh
-
Read
1FF00h
-
Write 1DAAAh
18h
; bits 3 & 4 = 1
Write 0ECCCh
E7h
; complement of 18h
Write 0FF00h
-
; Data is don’t care
Read
00000h
-
; return to Normal Operation


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