HY29DL163 Hynix Semiconductor, HY29DL163 Datasheet - Page 14

• Manufacturer Part Number: HY29DL163
• Description: (HY29DL162 / HY29DL163) Simultaneous Read/Write Flash Memory
• Manufacturer: Hynix Semiconductor

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
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
this mode, formerly protected sectors can be pro-
grammed or erased by invoking the appropriate
commands (see Device Commands section).
Once V
ously protected sector groups are protected again.
Figure 3 illustrates the algorithm.
14
NOTE: If WP#/ACC = V
tors remain protected.
A[6] = 1, A]1] = 1, A]0] = 0
must be protected prior to
(Note: All sector groups
Write 0x60 to Address
Write 0x60 to device
ID
sector unprotect)
R E S E T # = V
TRYCNT = 1
Set Address:
is removed from RESET#, all the previ-
Wait 15 ms
G N U M = 0
Wait 1 us
S T A R T
ID
IL
, the two outermost boot sec-
ID
on the RESET# pin
Figure 2. Sector Unprotect Algorithm
A[6] = 1, A]1] = 1, A]0] = 0
A[19:12] = Group GNUM
Write 0x40 to Address
G N U M = G N U M + 1
Read from Address
Data = 0x00?
ID
Set Address:
G N U M = 1 6 ?
Wait 1 us
. While in
Y E S
N O
N O
Y E S
Electronic ID Operation (High Voltage Method)
The Electronic ID mode provides manufacturer and
device identification, sector protection verification
and Sec
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
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
n
A read cycle at address 0xXXX00 retrieves the
manufacturer code.
A read cycle at address 0xXXX01 in word mode
or 0xXXX02 in byte mode returns the device
code.
Increment TRYCNT
T R Y C N T = 1 0 0 0 ?
2
region protection status through identi-
N O
Y E S
UNPROTECT COMPLETE
W r i t e R e s e t C o m m a n d
DEVICE FAILURE
SECTOR GROUP
R E S E T # = V
ID
on address
IH
r1.3/June 01