D A T A S H E E T
In addition, when verifying sector protection, the sector
Autoselect Mode
address must appear on the appropriate highest order
address bits (see Table 2). Table 3 shows the remain-
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.
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.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Tables 10 and 11. This
method does not require VID. Refer to the Autoselect
Command Sequence section for more information.
When using programming equipment, the autoselect
mode requires VID on address pin A9. Address pins
A6, A3, A2, A1, and A0 must be as shown in Table 3.
Table 2. Autoselect Codes, (High Voltage Method)
DQ8 to DQ15
A21 A14
A8
A9 to A6
A7
A5 A3
to to
A4 A2
Description
CE# OE# WE# to
to
A1 A0
DQ7 to DQ0
BYTE#= BYTE# =
A15 A10
VIH
00
22
22
VIL
VID
Manufacturer ID: AMD
Cycle 1
L
L
L
L
H
H
X
X
X
L
X
L
L
L
L
L
H
L
X
01h
7Eh
0Ch
X
Cycle 2
H
H
X
VID
X
X
X
L
X
Cycle 3
H
H
H
22
X
01h
Sector Protection
Verification
01h (protected),
00h (unprotected)
VID
VID
L
L
L
L
H
H
SA
X
X
X
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)
L
L
H
H
H
H
X
X
X
X
SecSi Sector Indicator
Bit (DQ7), WP# protects
lowest address sector
88h (factory locked),
08h (not factory locked)
VID
L
L
H
X
X
X
L
X
Legend: L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.
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.
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 Table 4). The hardware sector
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.
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 Autoselect Mode
section for details.
Sector protection/unprotection requires VID on the RE-
SET# pin only, and can be implemented either in-sys-
tem or via programming equipment. Figure 2 shows
Table 3. Sector Group Protection/Unprotection Address Table
Sector Group
SA0
A21–A15
0000000
0000001
0000010
0000011
00001xx
00010xx
00011xx
SA1
SA2
SA3
SA4–SA7
SA8–SA11
SA12–SA15
16
Am29LV640MH/L
December 14, 2005
SPANSION [ SPANSION ]
