AM29LV641G AMD [Advanced Micro Devices], AM29LV641G Datasheet - Page 18

• Manufacturer Part Number: AM29LV641G
• 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 programm ing
algorithm. However, the autoselect codes can also be
accessed in-system through the command register.
When using programming equipment, the autoselect
mode requires V
Address pins A6, A1, and A0 must be as shown in
Legend: L = Logic Low = V
Note: SecSi™ Sector Indicator Bit (DQ7) exist only in the Am29LV641GH/L devices.
19
Manufacturer ID:
AMD
Sector Protection
Verification
SecSi™ Sector
Indicator Bit (DQ7)
SecSi™ Sector
Indicator Bit (DQ7),
WP# protects highest
address sector
SecSi™ Sector
Indicator Bit (DQ7),
WP# protects lowest
address sector
Description
Read Cycle 1
Read Cycle 2
Read Cycle 3
ID
(8.5 V to 12.5 V) on address pin A9.
CE#
L
L
L
L
L
L
L
L
IL
OE#
, H = Logic High = V
L
L
L
L
L
L
L
L
Table 3. Autoselect Codes, (High Voltage Method)
WE#
A D V A N C E
H
H
H
H
H
H
H
H
A21
A15
SA
to
X
X
X
X
X
X
X
IH
, SA = Sector Address, X = Don’t care.
A14
A10
to
X
X
X
X
X
X
X
X
Am29LV641G
I N F O R M A T I O N
V
V
V
V
V
V
V
V
A9
ID
ID
ID
ID
ID
ID
ID
ID
Table 3. 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 remaining address bits that are don’t care.
When all necessary bits have been set as required,
the programming equipment may then read the corre-
sponding 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 section for more information.
A8
A7
to
X
X
X
X
X
X
0Eh
0Fh
A7
A0
to
—
—
—
—
—
—
A6
L
L
L
L
L
L
L
L
A5
A2
to
X
X
X
X
X
X
ID
. Refer to the Autoselect Com-
A1
H
H
H
H
L
L
L
L
A0
H
H
H
H
H
H
L
L
18h (not factory locked)
XX98h (factory locked),
XX88h (factory locked),
98h (factory locked),
XX18h (not factory
XX08h (not factory
00h (unprotected)
01h (protected),
June 14, 2005
locked)
locked)
XX01h
22D7h
XX00h
220Fh
DQ15
DQ0
to