AM29PDL128G AMD [Advanced Micro Devices], AM29PDL128G Datasheet - Page 22

• Manufacturer Part Number: AM29PDL128G
• Description: 128 Megabit (8 M x 16-Bit/4 M x 32-Bit) CMOS 3.0 Volt-only, Simultaneous Read/ Write Flash Memory with VersatileIOTM Control
• 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
must be as shown in
ing sector protection, the sector address must appear
on the appropriate highest order address bits (see
Table
that are don’t care. When all necessary bits have been
set as required, the programming equipment may then
Legend: L = Logic Low = V
Note: The autoselect codes may also be accessed in-system via command sequences.
October 28, 2004
Manufacturer ID:
AMD
Sector Protection
Verification
SecSi Indicator Bit
(DQ7)
Description
Read
Cycle 1
Read
Cycle 2
Read
Cycle 3
5).
Table 7
CE# OE# WE#
ID
Am29PDL128G
L
L
L
L
shows the remaining address bits
on address pin A9. Address pins
IL
Device
Table
, H = Logic High = V
L
L
L
L
7. In addition, when verify-
H
H
H
H
Table 7. Autoselect Codes (High Voltage Method)
A21
A11
SA
to
X
X
X
IH
Table 6.
A10
, BA = Bank Address, SA = Sector Address, X = Don’t care.
X
X
X
X
P R E L I M I N A R Y
V
V
V
V
A9
ID
ID
ID
ID
SecSi ™ Sector Addresses
A8
Am29PDL128G
X
X
X
X
128 words/64 double
Sector Size
A7
X
L
L
X
words
A6
L
L
L
L
L
L
read the corresponding identifier code on DQ7–DQ0.
However, the autoselect codes can also be accessed
in-system through the command register, for instances
when the device is erased or programmed in a system
without access to high voltage on the A9 pin. The com-
mand sequence is illustrated in
Note that if a Bank Address (BA) on address bits A21,
A20, and A19 is asserted during the third write cycle of
the autoselect command, the host system can read
autoselect data that bank and then immediately read
array data from the other bank, without exiting the au-
toselect mode.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in
does not require V
Sequence”
A5
A4
to
H
X
L
X
A3
H
H
H
L
L
L
for more information.
000000h–00003Fh
A2
H
H
L
L
L
L
Address Range
A1
H
H
H
H
(x32)
L
L
ID
. Refer to
A0
H
H
H
L
L
L
DQ31 to DQ8
(Word/Double
000000h
222222h
222222h
222222h
000000h
000000h
Word)
22h/
22h/
22h/
00h/
00h/
“Autoselect Command
Table 14
Table
000000h–00007Fh
Address Range
16. This method
00h (unprotected)
01h (protected),
(factory locked),
00h (not factory
(x16)
and
to DQ0
locked)
DQ7
0Dh
01h
7Eh
00h
80h
Table
16.
21