AM29F002N AMD [Advanced Micro Devices], AM29F002N Datasheet - Page 9

• Manufacturer Part Number: AM29F002N
• Description: 2 Megabit (256 K x 8-Bit) CMOS 5.0 Volt-only Boot Sector Flash Memory
• 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 equipment
to automatically match a device to be programmed with
its corresponding programming algorithm. However,
the autoselect codes can also be accessed in-system
through the command register.
When using programming equipment, the autoselect
mode requires V
A9. Address pins A6, A1, and A0 must be as shown in
Autoselect Codes (High Voltage Method) table. In addi-
tion, when verifying sector protection, the sector ad-
L = Logic Low = V
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 pro-
tected sectors.
Manufacturer ID: AMD
Device ID:
Am29F002/Am29F002N
(Top Boot Block)
Device ID:
Am29F002/Am29F002N
(Bottom Boot Block)
Sector Protection Verification
Sector
SA0
SA1
SA2
SA3
SA4
SA5
SA6
Description
A17
IL
Table 3. Am29F002/Am29F002N Bottom Boot Block Sector Address Table
ID
Table 4. Am29F002/Am29F002N Autoselect Codes (High Voltage Method)
0
0
0
0
0
1
1
, H = Logic High = V
(11.5 V to 12.5 V) on address pin
A16
0
0
0
0
1
0
1
CE#
L
L
L
L
L
L
IH
A15
, SA = Sector Address, X = Don’t care.
OE#
X
X
X
0
0
0
1
L
L
L
L
L
L
Am29F002/Am29F002N
WE#
H
H
H
H
H
H
A14
P R E L I M I N A R Y
X
X
X
X
0
1
1
A17
A13
SA
to
X
X
X
A12
A10
A13
to
X
X
X
X
X
X
X
X
X
0
1
dress must appear on the appropriate highest order
address bits. Refer to the corresponding Sector Ad-
dress Tables. The Command Definitions table shows
the remaining address bits that are don’t care. When all
necessary bits have been set as required, the program-
ming 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 the Command Defini-
tions table. This method does not require V
“Command Definitions” for details on using the autose-
lect mode.
Sector protection/unprotection must be implemented
using programming equipment. The procedure re-
quires a high voltage (V
control pins. Details on this method are provided in the
supplements, publication numbers 20819 and 21183.
V
V
V
V
A9
ID
ID
ID
ID
Sector Size
A8
A7
to
X
X
X
X
(Kbytes)
16
32
64
64
64
8
8
A6
L
L
L
L
A5
A2
to
X
X
X
X
ID
) on address pin A9 and the
A1
H
L
L
L
(in hexadecimal)
08000h–0FFFFh
10000h–1FFFFh
20000h–2FFFFh
30000h–3FFFFh
Address Range
00000h–03FFFh
04000h–05FFFh
06000h–07FFFh
A0
H
H
L
L
(unprotected)
(protected)
DQ7
DQ0
B0h
01h
34h
01h
00h
to
ID
. See
9