HY29LV160 Datasheet, PDF (42/48 Pages) Hynix Semiconductor – 16 Mbit (2M x 8/1M x 16) Low Voltage Flash Memory

HY29LV160
APPENDIX
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_ID) on address pin A[9]
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_CC must be applied to the device before applying
V_ID, and V_ID should be removed before removing
V_CC from the device.
Programming of the protection circuitry begins on
the falling edge of WE# and is terminated on the
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_ID) on address pin A[9]
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_CC
must be applied to the device before applying V_ID,
and V_ID should be removed before removing V_CC
from the device.
DC CHARACTERISTICS
Sector Protection and Unprotection Using Programming Equipment
Parameter
Description
Test Conditions
Min
Max Unit
V_CC Operating Power Supply
V_ID
Voltage for Sector Protect, Unprotect
and Verify
V_CC = 3.0 V
3.0
3.6
V
11.5
12.5
V
I_LIT
High Voltage Input Load Current
(A[9], OE#)
V_CC = V_CC Max
A[9] = OE# = 12.5 V
35
µA
V_IL
Input Low Voltage
V_IH Input High Voltage
-0.5
0.8
V
2.0 V_CC + 0.5 V
Sector Protection and Unprotection Verification Using Programming Equipment ¹
Operation
CE# OE# WE# RESET# A[19:12] A[9] A[6] A[1] A[0] DQ[7:0]
Sector Protect Verification
Sector Unprotect Verification
L LH
L
H
Sector
Address
V_ID
HL
H
0x01
0x00
Notes:
1. L = V , H = V .
IL
IH
42
Rev. 1.2/May 01