HY29F080 Datasheet, PDF (9/38 Pages) Hynix Semiconductor – 8 Megabit (1M x 8), 5 Volt-only, Flash Memory

HY29F080
START
NOTE: All sectors must be
previously protected.
APPLY V _CC
Set: TRYCNT = 1
Set: NGRP = 0
Set: A9 = CE# = OE# = V _ID
Set: RESET# = V _IH
WE# = V _IL
Wait t_WPP2
WE# = V _IH
Set:
A9 = V _ID
OE# = CE# = V _IL
Set Sector Group Address:
A[19:17] = Group NGRP
A0 = A6 = V _IL
A1 = V _IH
Read Data
NO
Data = 0x00?
Increment TRYCNT
NO
YES
TRYCNT = 1000?
YES
YES
NGRP = 7?
NO
NGRP = NGRP + 1
Remove V _ID from A9
SECTOR UNPROTECT
COMPLETE
DEVICE FAILURE
Figure 2. Sector Group Unprotect Procedure
n A read cycle at address 0xXXX01 returns the
device code (HY29F080 = 0xD5).
n 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.
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 Group Unprotect
Rev. 6.1/May 01
9