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HY29F400ATT-50I Datasheet(PDF) 9 Page - Hynix Semiconductor

Part # HY29F400ATT-50I
Description  4 Megabit (512Kx8/256Kx16) 5 Volt-only Flash Memory
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Manufacturer  HYNIX [Hynix Semiconductor]
Direct Link  http://www.skhynix.com/kor/main.do
Logo HYNIX - Hynix Semiconductor

HY29F400ATT-50I Datasheet(HTML) 9 Page - Hynix Semiconductor

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9
Rev. 1.0/Jan. 02
HY29F400A
The procedure for sector unprotection is illustrated
in the flow chart in Figure 2, and timing specifica-
tions and waveforms are given at the end of this
document. Note that to unprotect any sector, all
unprotected sectors must first be protected prior
to the first unprotect write cycle.
Sectors can also be temporarily unprotected as
described in the next section.
Temporary Sector Unprotect Operation
This feature allows temporary unprotection of pre-
viously protected sectors to allow changing the
data in-system. Temporary Sector Unprotect mode
is activated by setting the RESET# pin to V
ID. While
in this mode, formerly protected sectors can be
programmed or erased by invoking the appropri-
ate commands (see Device Commands section).
Once V
ID is removed from RESET#, all the previ-
ously protected sectors are protected again. Fig-
ure 3 illustrates the algorithm.
START
NOTE: All sectors must be
previously protected.
Set: TRYCNT = 1
Set: A[9] = CE# = OE# = V
ID
Set: RESET# = V
IH
WE# = V
IL
Wait t
WPP2
Set:
A[9] = V
ID
OE# = CE# = V
IL
Read Data
Data = 0x00?
NSEC = 10?
YES
TRYCNT = 1000?
NO
Increment TRYCNT
NO
YES
DEVICE FAILURE
NO
YES
Remove V
ID from A[9]
SECTOR UNPROTECT
COMPLETE
APPLY V
CC
Set Sector Address:
A[17:12] = Sector NSEC
A[0] = A[6] = V
IL
A[1] = V
IH
NSEC = NSEC + 1
Set: NSEC = 0
WE# = V
IH
Figure 2. Sector Unprotect Procedure
START
RESET# = V
ID
(All protected sector groups
become unprotected)
Perform Program or Erase
Operations
RESET# = V
IH
(All previously protected
sector groups return to
protected state)
TEMPORARY SECTOR
UNPROTECT COMPLETE
Figure 3. Temporary Sector Unprotect


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