AM29LV640MH SPANSION [SPANSION], AM29LV640MH Datasheet - Page 18

• Manufacturer Part Number: AM29LV640MH
• Description: 64 Megabit (4 M x 16-Bit/8 M x 8-Bit) MirrorBit 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O Control
• Manufacturer: SPANSION [SPANSION]

Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification, and sector protection verification,
through identifier codes output on DQ7–DQ0. This
mode is primarily intended for programming equip-
ment to automatically match a device to be pro-
grammed with its corresponding programming
algorithm. However, the autoselect codes can also be
accessed in-system through the command register.
When using programming equipment, the autoselect
mode requires
A6, A3, A2, A1, and A0 must be as shown in
Legend: L = Logic Low = V
Sector Group Protection and
Unprotection
The hardware sector group protection feature disables
both program and erase operations in any sector
group. In this device, a sector group consists of four
adjacent sectors that are protected or unprotected at
the same time (see
group unprotection feature re-enables both program
and erase operations in previously protected sector
groups. Sector group protection/unprotection can be
implemented via two methods.
Sector protection/unprotection requires V
SET# pin only, and can be implemented either in-sys-
tem or via programming equipment. Figure 2 shows
16
Manufacturer ID: AMD
Sector Protection
Verification
SecSi Sector Indicator
Bit (DQ7), WP# protects
highest address sector
SecSi Sector Indicator
Bit (DQ7), WP# protects
lowest address sector
Description
Cycle 1
Cycle 2
Cycle 3
V
ID
on address pin A9. Address pins
CE#
IL
L
L
L
L
L
Table
, H = Logic High = V
Table 3. Sector Group Protection/Unprotection Address Table
OE# WE#
L
L
L
L
L
4). The hardware sector
Table 2. Autoselect Codes, (High Voltage Method)
Sector Group
SA12–SA15
H
H
H
H
H
SA8–SA11
SA4–SA7
SA0
SA1
SA2
SA3
A21
A15
SA
to
X
X
X
X
IH
, SA = Sector Address, X = Don’t care.
ID
A14
A10
to
X
X
X
X
X
on the RE-
D A T A S H E E T
Table
V
V
V
V
V
A9
ID
ID
ID
ID
ID
Am29LV640MH/L
A8
A7
to
X
X
X
X
X
3.
A6
L
L
L
L
L
In addition, when verifying sector protection, the sector
address must appear on the appropriate highest order
address bits (see
ing address bits that are don’t care. When all neces-
sary bits have been set as required, the programming
equipment may then read the corresponding identifier
code on DQ7–DQ0.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Tables
method does not require V
Command Sequence
the algorithms and Figure 24 shows the timing dia-
gram. This method uses standard microprocessor bus
cycle timing. For sector group unprotect, all unpro-
tected sector groups must first be protected prior to
the first sector group unprotect write cycle.
The device is shipped with all sector groups unpro-
tected. AMD offers the option of programming and pro-
tecting sector groups at its factory prior to shipping the
device through AMD’s ExpressFlash™ Service. Con-
tact an AMD representative for details.
It is possible to determine whether a sector group is
protected or unprotected. See the
section for details.
A5
A4
to
X
X
X
X
X
A3
A2
to
H
H
L
L
L
L
L
A1
H
H
H
H
H
L
L
A21–A15
0000000
0000001
0000010
0000011
00001xx
00010xx
00011xx
A0
H
H
H
H
L
L
L
Table
BYTE#=
DQ8 to DQ15
V
00
22
22
22
section for more information.
X
X
X
IH
2).
BYTE# =
Table 3
ID
. Refer to the
V
X
X
X
X
X
X
X
IL
December 14, 2005
18h (not factory locked)
08h (not factory locked)
shows the remain-
98h (factory locked),
88h (factory locked),
Autoselect Mode
00h (unprotected)
01h (protected),
10
DQ7 to DQ0
and 11. This
0Ch
01h
7Eh
01h
Autoselect