12
Am29PL160C
June 12, 2002
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 equipment
to automatically match a device to be programmed
with its corresponding programming algorithm. How-
ever, the autoselect codes can also be accessed in-
system through the command register.
When using programming equipment, the autoselect
mode requires V
ID
(11.5 V to 12.5 V) on address pin
A9. Address pins A6, A1, and A0 must be as shown in
Table 5. In addition, when verifying sector protection,
the sector address must appear on the appropriate
highest order address bits (Table 4). Table 5 shows the
remaining address bits that are don’t care. When all
necessary bits have been set as required, the pro-
gramming 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 Table 10. This method
does not require V
ID
. See “Command Definitions” for
details on using the autoselect mode.
Table 5.
Am29PL160C Autoselect Codes (High Voltage Method)
L = Logic Low = V
IL
, H = Logic High = V
IH
, SA = Sector Address, X = Don’t care.
Note:
The autoselect codes may also be accessed in-system via command sequences. See Table 10.
Sector Protection/Unprotection
The hardware sector protection feature disables both
program and erase operations in any sector.
The hardware sector unprotection feature re-enables
both program and erase operations in previously
protected sectors.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at its factory prior to shipping the device
through AMD’s ExpressFlash Service. Contact an
AMD representative for details.
It is possible to determine whether a sector is protected
or unprotected. See “Autoselect Mode” for details.
Sector protection and unprotection must be imple-
mented using programming equipment. The procedure
requires V
ID
on address pin A9 and OE#. Details on
this method are provided in a supplement, publication
number 22239. Contact an AMD representative to re-
quest a copy.
The device features a temporary unprotect command
sequence to allow changing array data in-system. See
“Temporary Unprotect Enable/Disable Command Se-
quence” for more information.
Description
Mode
CE#
OE#
WE#
A19
to
A12
A11
to
A10
A9
A8
to
A7
A6
A5
to
A2
A1
A0
DQ8
to
DQ15
DQ7
to
DQ0
Manufacturer ID
:
AMD
L
L
H
X
X
V
ID
X
L
X
L
L
X
01h
Device ID:
Am29PL160C
(Bottom Boot Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
H
22h
45h
Byte
L
L
H
X
45h
Sector Protection Verification
L
L
H
SA
X
V
ID
X
L
X
H
L
X
01h
(protected)
X
00h
(unprotected)