HY29F080 Hynix Semiconductor, HY29F080 Datasheet - Page 9

• Manufacturer Part Number: HY29F080
• Description: 8 Megabit (1M X 8), 5 Volt-only, Flash Memory
• Manufacturer: Hynix Semiconductor

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Rev. 6.1/May 01
A read cycle at address 0xXXX01 returns the
device code (HY29F080 = 0xD5).
A read cycle containing a sector group address
(Table 1) in A[19:17] and the address 0x02 in
A[7:0] returns 0x01 if that sector is protected,
or 0x00 if it is unprotected.
NOTE: All sectors must be
Set: A9 = CE# = OE# = V
previously protected.
Set: RESET# = V
Set: TRYCNT = 1
OE# = CE# = V
Set: NGRP = 0
APPLY V
W E # = V
W E # = V
Wait t
A9 = V
START
Set:
W P P 2
ID
CC
IL
IH
IL
IH
ID
Figure 2. Sector Group Unprotect Procedure
Set Sector Group Address:
A[19:17] = Group NGRP
NGRP = NGRP + 1
A0 = A6 = V
Data = 0x00?
NGRP = 7?
Read Data
A1 = V
Y E S
N O
IH
IL
N O
Y E S
Figure 3. Temporary Sector Group Unprotect
SECTOR UNPROTECT
Remove V
Increment TRYCNT
TRYCNT = 1000?
C O M P L E T E
ID
N O
from A9
(All protected sector groups
UNPROTECT COMPLETE
Perform Program or Erase
TEMPORARY SECTOR
(All previously protected
sector groups return to
become unprotected)
protected state)
R E S E T # = V
R E S E T # = V
Operations
Y E S
START
ID
IH
DEVICE FAILURE
HY29F080
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