HY29LV160 Datasheet, PDF (11/48 Pages) Hynix Semiconductor – 16 Mbit (2M x 8/1M x 16) Low Voltage Flash Memory

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
HY29LV160
Set Address:
A[19:12] = 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 = 34?
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)
TEMPORARY SECTOR
UNPROTECT COMPLETE
Figure 3. Temporary Sector Unprotect
Algorithm
Electronic ID Operation (High Voltage Method)
The Electronic ID mode provides manufacturer and
device identification and sector protection verifi-
cation through codes output on DQ[15:0]. This
mode is intended primarily for programming equip-
ment to automatically match a device to be pro-
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 informa-
tion:
Ÿ A read cycle at address 0xXXX00 retrieves the
manufacturer code.
Ÿ A read cycle at address 0xXXX01 in Word
mode or 0xXXX02 in Byte mode returns the
device code.
Ÿ A read cycle containing a sector address (SA)
in A[19:12] 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.
Rev. 1.2/May 01
11