HY29LV160 Hynix Semiconductor, HY29LV160 Datasheet - Page 42

• Manufacturer Part Number: HY29LV160
• Description: 16 Mbit (2M x 8/1M x 16) Low Voltage Flash Memory
• Manufacturer: Hynix Semiconductor

HY29LV160
SECTOR PROTECTION/UNPROTECTION
USING PROGRAMMING EQUIPMENT
In addition to in-situ sector protection/unprotec-
tion, described in the Bus Operations section, the
HY29LV160 is capable of performing the same
functions using programming equipment. This
appendix describes the procedures and provides
specifications for these functions.
Sector Protect
The hardware sector protection feature disables
both program and erase operations in any sector
or combination of sectors.
The method intended for programming equipment
requires a high voltage (V
and the OE# pin. The flow chart in Figure A1 il-
lustrates the algorithm, and timing specifications
and waveforms are provided at the end of this sec-
tion. When implementing the algorithm, note that
V
V
V
Programming of the protection circuitry begins on
the falling edge of WE# and is terminated on the
Sector Protection and Unprotection Verification Using Programming Equipment
Notes:
1. L = V
DC CHARACTERISTICS
Sector Protection and Unprotection Using Programming Equipment
42
S
S
P
CC
ID
CC
e
e
a
, and V
t c
t c
a r
must be applied to the device before applying
from the device.
V
r o
r o
V
V
V
I
m
L
C
D I
H I
T I
L I
C
O
P
U
IL
t e
, H = V
p
o r
n
r e
p
r e
ID
e t
o r
t a
t c
n I
n I
should be removed before removing
O
a
H
A (
V
e t
o i
n
g i
l o
p
p
p
IH
t c
9 [
V
d
t u
t u
r e
.
h
n
a t
e
, ]
V
V
V
i r
t a
g
L
H
r e
e
O
c i f
l o
e
o
g i
n i
i r
y f i
w
a t
E
f
t a
c i f
g
h
r o
) #
g
V
o i
V
P
t a
e
l o
S
l o
o
n
o i
n I
w
e
D
a t
a t
n
t c
e
r e
p
g
g
ID
s
t u
r o
e
e
) on address pin A[9]
c
S
i r
L
P
u
o
t p
p
o r
a
p
o i
d
e t
y l
n
C
c
C
, t
r u
E
L
U
e r
#
n
t n
p
O
o r
L
E
e t
#
t c
APPENDIX
W
H
E
V
V
[ A
#
C
C
] 9
C
C
R
=
=
=
rising edge of the same pulse. Verification of pro-
tection is done as described in the Electronic ID
Mode section and shown in the flow chart.
The HY29LV160 is shipped with all sectors un-
protected.
Sector Unprotect
The hardware sector unprotection feature re-en-
ables both program and erase operations in pre-
viously protected sectors. Note that to unprotect
any sector, all unprotected sectors must first be
protected prior to the first sector unprotect write
cycle.
The method intended for programming equipment
requires a high voltage (V
and the OE# pin. The flow chart in Figure A2 illus-
trates the algorithm, and timing specifications and
waveforms are given at the end of this section.
When implementing the algorithm, note that V
must be applied to the device before applying V
and V
from the device.
E
T
3
V
O
e
S
0 .
C
H
t s
E
C
E
V
T
#
M
C
#
=
ID
a
o
x
A
A
n
1
should be removed before removing V
S
1 [
d
d
2
e
d
t i
5 .
9
t c
e r
o i
1 :
V
r o
n
s s
] 2
s
[ A
V
D I
] 9
[ A
H
L
1
0 -
] 6
M
3
2
1
0 .
0 .
n i
5 .
5 .
ID
[ A
) on address pin A[9]
H
] 1
V
[ A
C
1
M
C
1
L
3
0
3
] 0
2
+
a
6 .
8 .
5
5 .
Rev. 1.2/May 01
x
0
5 .
D
Q
0
0
0 x
0 x
[
U
: 7
µ
V
V
V
V
0
n
1
A
] 0
t i
ID
CC
CC
,