HY29LV800 Datasheet, PDF (10/40 Pages) Hynix Semiconductor – 8 Mbit (1M x 8/512K x 16) Low Voltage Flash Memory

HY29LV800
START
(Note: All sectors must be
protected prior to
unprotecting any sector)
TRYCNT = 1
SNUM = 0
RESET# = V_ID
Wait 1 us
Write 0x60 to device
Set Address:
A[6] = 1, A]1] = 1, A]0] = 0
Write 0x60 to Address
Wait 15 ms
Set Address:
A[18:12] = Sector SNUM
A[6] = 1, A]1] = 1, A]0] = 0
Write 0x40 to Address
Read from Address
NO
Data = 0x00?
TRYCNT = 1000? ^YES
YES
YES
SNUM = 18?
NO
SNUM = SNUM + 1
NO
Increment TRYCNT
RESET# = V_IH
Write Reset Command
SECTOR UNPROTECT
COMPLETE
DEVICE FAILURE
Figure 2. Sector Unprotect Algorithm
START
RESET# = V_ID
(All protected sectors
become unprotected)
Perform Program or Erase
Operations
RESET# = V_IH
(All previously protected
sectors return to protected
state)
grammed with its corresponding programming al-
gorithm.
Two methods are provided for accessing the Elec-
tronic ID data. The first requires V_ID on address
pin A[9], with additional requirements for obtain-
ing specific data items listed in Table 4. The Elec-
tronic ID data can also be obtained by the host
through specific commands issued via the com-
mand register, as described in the ‘Device Com-
mands’ section of this data sheet.
While in the high-voltage Electronic ID mode, the
system may read at specific addresses to obtain
certain device identification and status information:
TEMPORARY SECTOR
UNPROTECT COMPLETE
n A read cycle at address 0xXXX00 retrieves the
manufacturer code.
Figure 3. Temporary Sector Unprotect
Algorithm
n A read cycle at address 0xXXX01 in Word
mode or 0xXXX02 in Byte mode returns the
device code.
n A read cycle containing a sector address (SA)
in A[18:12] and the address 0x02 in Word mode
or 0x04 in Byte mode, returns 0x01 if that sec-
tor is protected, or 0x00 if it is unprotected.
10
Rev. 1.0/Nov. 01