ES29LV160F Datasheet, PDF (67/71 Pages) Excel Semiconductor Inc. – 16 Megabit (2 M x 8-Bit/1 M x 16-Bit) CMOS 3.0 Volt-only Boot Sector Flash Memory

ES29LV160F
Excel Semiconductor Inc.
A7. Sector protection and un-protection by A9
High-Voltage
The ES29LV160F features hardware sector protection. In the device, sector protection is
performed on the sectors. Once after a sector is protected, any program or erase operation is not
allowed in the protected sector. The previously protected sectors must be unprotected by one of
the unprotect methods provided here before changing data in those sectors.
Sector protection or unprotection can be implemented via two methods.
„ In-system method
„ A9 High-voltage method
To check whether the sector protection or unprotection was successfully executed or not, another
operation called “verification” needs to be performed after the protection or unprotection operation
on a sector. All protection and unprotect verifications provided in the device are summarized in
detail at the Table A6.
‘A9 High-voltage method’, an alternate method intended only for programming equipment, must
force VID (11.5~12.5V) on address pin A9 and control pin OE# with A6=0, A1=1 and A0=0. Refer
to Fig.A6 and Fig.A7 for timing diagram and Fig.A4 and Fig.A5 for the protection/unproection
algorithm.
Table A6. Autoselect code by A9-High Voltage Method
DQ8~DQ15
A19
Description ^CE#
OE#
WE#
To
A12
A9
A6
A1
A0 BYTE# BYTE#
= VIH
=VIL
DQ7 ~DQ0
Manufac-
tureID:ESI
L
L
H
X
VID _L
L
L
X
X
4Ah
Device ID:
ES29LV160F
L
L
H
X
VID _L
H
H
22H
X
C4h(T), 49h(B)
Sector
Protection
Verification
L
L
H
SA ^VID L
L
L
X
X
01h(protected)
00h(unprotected)
Security
Sector
Indicator
Bit(DQ7)
L
L
H
X VID L
H
H
X
82h(Factory
Locked)
X
02h(Unlocked)
42h(Customer
Locked)
Note ) Other pins are “don’t care”, and ACC pin can be floated (NC) or connected to V_CC or Vss, except an V_HH (=12V).
Rev.0A (Dec 12, 2007) 67