AM29PDL128G70 SPANSION [SPANSION], AM29PDL128G70 Datasheet - Page 21

• Manufacturer Part Number: AM29PDL128G70
• Description: 128 Megabit (8 M x 16-Bit/4 M x 32-Bit) CMOS 3.0 Volt-only, Simultaneous Read/ Write Flash Memory with VersatileIO Control
• Manufacturer: SPANSION [SPANSION]

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.
20
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
Table 6.
IH
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
A8
Am29PDL128G
X
X
X
X
128 words/64 double
Sector Size
A7
X
L
L
X
words
Sector Addresses
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
command sequence is illustrated in Tables
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 Tables
method does not require V
Command Sequence
A5
A4
to
X
H
X
L
A3
H
H
H
L
L
L
000000h–00003Fh
A2
H
H
L
L
L
L
Address Range
A1
H
H
H
H
L
L
(x32)
A0
H
H
H
section for more information.
L
L
L
DQ31 to DQ8
(Word/Double
ID
000000h
222222h
222222h
222222h
000000h
000000h
. Refer to the
Word)
22h/
22h/
22h/
00h/
00h/
000000h–00007Fh
Address Range
14
00h (unprotected)
01h (protected),
(factory locked),
00h (not factory
July 29, 2002
(x16)
and 16. This
14
Autoselect
to DQ0
locked)
DQ7
0Dh
7Eh
01h
00h
80h
and 16.