Table 6. In addition, when verifying sector protection,
the sector address must appear on the appropriate
highest order address bits (see Table 2). Table 6
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.
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.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 13. This method
does not require VID. Refer to the Autoselect Com-
mand Sequence section for more information.
When using programming equipment, the autoselect
mode requires VID (8.5 V to 12.5 V) on address pin A9.
Address pins A6, A1, and A0 must be as shown in
Table 6. Autoselect Codes, (High Voltage Method)
DQ15 to DQ8
A20 A11
to to
A8
to
A5
to
DQ7
to
BYTE# BYTE#
Description
CE# OE# WE# A12 A10 A9 A7 A6 A4
A1 A0
= VIH
= VIL
DQ0
A3
A2
Manufacturer ID:
AMD
VID
L
L
H
BA
X
X
L
X
X
X
L
L
X
X
01h
VID
VID
VID
Read Cycle 1
Read Cycle 2
Read Cycle 3
L
L
L
L
L
L
H
H
H
BA
BA
BA
X
X
X
X
X
X
L
L
L
X
X
X
L
H
H
L
H
H
L
H
H
H
L
22h
22h
22h
X
X
X
7Eh
0Ah
H
01h (T), 00h (B)
Sector Protection
Verification
01h (protected),
00h (unprotected)
VID
VID
L
L
L
L
H
H
SA
BA
X
X
X
X
L
L
X
X
X
X
X
X
H
H
L
X
X
X
X
82h (factory locked),
02h (not factory
locked)
SecSi™ Indicator
Bit (DQ7)
H
Legend: T = Top Boot Block, B = Bottom Boot Block, L = Logic Low = VIL, H = Logic High = VIH, BA = Bank Address, SA = Sector Address, X =
Don’t care.
Notes:
1. The bank address bits are A20–A18.
2. The device ID must be read across three cycles.
16
Am29DL320G
September 27, 2004
SPANSION [ SPANSION ]
