A d v a n c e I n f o r m a t i o n
Table 5. Autoselect Codes, (High Voltage Method)
DQ8 to DQ15
A22 A14
to to
A15 A10
A8
to A6
A7
A5
to
A4
A3
to
A2
WE
#
Description
CE# OE#
A9
A1
A0
DQ7 to DQ0
BYTE#= BYTE#
VIH
= VIL
Manufacturer ID:
L
L
L
L
H
H
X
X
X
X
VID
X
X
L
L
X
X
L
L
L
00
X
01h
Spansion Product
Cycle 1
Cycle 2
Cycle 3
Cycle 1
Cycle 2
Cycle 3
Cycle 1
Cycle 2
Cycle 3
L
H
H
L
L
H
H
L
H
L
22
22
22
22
22
22
22
22
22
X
X
X
X
X
X
X
X
X
7Eh
23h
01h
7Eh
22h
01h
7Eh
21h
01h
VID
VID
VID
H
H
L
L
L
L
L
H
H
X
X
X
X
X
X
L
L
X
X
H
H
L
H
H
L
H
H
L
H
H
H
H
H
Sector Group
Protection Verification
01h (protected),
00h (unprotected)
L
L
L
L
H
H
SA
X
X
X
VID
X
X
L
L
X
X
L
H
L
X
X
SecSi Sector Indicator
Bit (DQ7), WP#
protects highest
address sector
98h (factory locked),
18h (not factory locked)
VID
L
H
H
X
X
SecSi Sector Indicator
Bit (DQ7), WP#
protects lowest
88h (factory locked),
08h (not factory locked)
L
L
H
X
X
VID
X
L
X
L
H
H
X
X
address sector
Legend: L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.
Sector Protection
The device features several levels of sector protection, which can disable both the
program and erase operations in certain sectors or sector groups:
Persistent Sector Protection
A command sector protection method that replaces the old 12 V controlled pro-
tection method.
Password Sector Protection
A highly sophisticated protection method that requires a password before
changes to certain sectors or sector groups are permitted
WP# Hardware Protection
A write protect pin that can prevent program or erase operations in the outermost
sectors.
The WP# Hardware Protection feature is always available, independent of the
software managed protection method chosen.
Selecting a Sector Protection Mode
All parts default to operate in the Persistent Sector Protection mode. The cus-
tomer must then choose if the Persistent or Password Protection method is most
desirable. There are two one-time programmable non-volatile bits that define
which sector protection method will be used. If the customer decides to continue
May 13, 2004 27631A4
S29GLxxxN MirrorBitTM Flash Family
45
SPANSION [ SPANSION ]
