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HY29DL162 Datasheet(PDF) 14 Page - Hynix Semiconductor

Part No. HY29DL162
Description  16 Megabit (2M x 8/1M x16) Low Voltage, Dual Bank, Simultaneous Read/Write Flash Memory
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Maker  HYNIX [Hynix Semiconductor]
Homepage  http://www.skhynix.com/ko/index.jsp
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HY29DL162 Datasheet(HTML) 14 Page - Hynix Semiconductor

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14
r1.3/June 01
HY29DL162/HY29DL163
cycle. Also, the unprotect procedure will cause
all sectors to become unprotected, thus, sector
groups that require protection must be protected
again after the unprotect procedure is run.
This procedure requires V
ID on the RESET#
pin
and uses standard microprocessor bus cycle tim-
ing to implement sector unprotection. The flow
chart in Figure 2 illustrates the algorithm.
Temporary Sector Unprotect Operation
This feature allows temporary unprotection of pro-
tected sectors to allow changing the data in-sys-
tem. Temporary Sector Unprotect mode is acti-
vated by setting the RESET# pin to V
ID.
While in
this mode, formerly protected sectors can be pro-
grammed or erased by invoking the appropriate
commands (see Device Commands section).
Once V
ID is removed from RESET#, all the previ-
ously protected sector groups are protected again.
Figure 3 illustrates the algorithm.
NOTE: If WP#/ACC = V
IL, the two outermost boot sec-
tors remain protected.
Figure 2. Sector Unprotect Algorithm
Electronic ID Operation (High Voltage Method)
The Electronic ID mode provides manufacturer and
device identification, sector protection verification
and Sec2 region protection status through identi-
fier codes output on DQ[7:0]. This mode is in-
tended primarily for programming equipment to au-
tomatically match a device to be programmed with
its corresponding programming algorithm.
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 6. The Elec-
tronic ID data can also be obtained by the host
through specific commands issued via the com-
mand register, as described later in the ‘Device
Commands’ 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:
n A read cycle at address 0xXXX00 retrieves the
manufacturer code.
n A read cycle at address 0xXXX01 in word mode
or 0xXXX02 in byte mode returns the device
code.
START
(Note: All sector groups
must be protected prior to
sector unprotect)
TRYCNT = 1
GNUM = 0
RESET# = V
ID
Wait 1 us
Write 0x60 to device
Write 0x60 to Address
Set Address:
A[19:12] = Group GNUM
A[6] = 1, A]1] = 1, A]0] = 0
Write 0x40 to Address
Read from Address
Data = 0x00?
GNUM = 16?
YES
TRYCNT = 1000?
NO
Increment TRYCNT
NO
YES
DEVICE FAILURE
YES
NO
RESET# = V
IH
Write Reset Command
SECTOR GROUP
UNPROTECT COMPLETE
GNUM = GNUM + 1
Wait 15 ms
Set Address:
A[6] = 1, A]1] = 1, A]0] = 0
Wait 1 us


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