AM29LV641ML AMD [Advanced Micro Devices], AM29LV641ML Datasheet - Page 16

• Manufacturer Part Number: AM29LV641ML
• Manufacturer: AMD [Advanced Micro Devices]

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 Table 3.
Legend: L = Logic Low = V
14
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
IL
, H = Logic High = V
CE#
L
L
L
L
L
Table 3. Autoselect Codes, (High Voltage Method)
OE#
L
L
L
L
L
WE#
H
H
H
H
H
IH
, SA = Sector Address, X = Don’t care.
A21
A15
SA
to
X
X
X
X
D A T A S H E E T
Am29LV641MH/L
A14
A10
to
X
X
X
X
X
V
V
V
V
V
A9
ID
ID
ID
ID
ID
In addition, when verifying sector protection, the sector
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.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 10. This method
does not require V
mand Sequence
A8
A7
to
X
X
X
X
X
A6
L
L
L
L
L
A5
A4
to
X
X
X
X
X
A3
A2
to
section for more information.
H
H
L
L
L
L
L
ID
. Refer to the
A1
H
H
H
H
H
L
L
A0
H
H
H
H
L
L
L
XX18h (not factory locked)
XX08h (not factory locked)
XX98h (factory locked),
XX88h (factory locked),
December 21, 2005
XX00h (unprotected)
XX01h (protected),
Autoselect Com-
DQ15 to DQ0
0001h
227Eh
2213h
2201h