AM29LV128MH AMD [Advanced Micro Devices], AM29LV128MH Datasheet - Page 20

• Manufacturer Part Number: AM29LV128MH
• Manufacturer: AMD [Advanced Micro Devices]

Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification, and sector group protection verifica-
tion, through identifier codes output on DQ7–DQ0.
This mode is primarily intended for programming
equipment to automatically match a device to be pro-
grammed with its corresponding programming algo-
rithm. However, the autoselect codes can also be
accessed in-system through the command register.
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.
Legend: L = Logic Low = V
18
Manufacturer ID: AMD
Sector Group
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
CE#
IL
L
L
L
L
L
, H = Logic High = V
OE# WE#
L
L
L
L
L
Table 3. Autoselect Codes, (High Voltage Method)
H
H
H
H
H
A22
A15
SA
to
X
X
X
X
IH
, SA = Sector Address, X = Don’t care.
A14
A10
to
X
X
X
X
X
D A T A S H E E T
V
V
V
V
V
A9
ID
ID
ID
ID
ID
Am29LV128MH/L
A8
A7
to
X
X
X
X
X
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 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 Tables 10 and 11. This
method does not require V
Command Sequence section for more information.
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
A0
H
H
H
H
L
L
L
BYTE#
= V
DQ8 to DQ15
00
22
22
22
X
X
X
IH
BYTE#
ID
= V
. Refer to the Autoselect
X
X
X
X
X
X
X
IL
September 9, 2003
18h (not factory locked)
08h (not factory locked)
98h (factory locked),
88h (factory locked),
00h (unprotected)
01h (protected),
DQ7 to DQ0
01h
7Eh
12h
00h