AM29F002NB AMD [Advanced Micro Devices], AM29F002NB Datasheet - Page 11

• Manufacturer Part Number: AM29F002NB
• 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
device 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
A1, and A0 must be as shown in Autoselect Codes
(High Voltage Method) table. In addition, when veri-
fying sector protection, the sector address must appear
L = Logic Low = V
Sector Protection/Unprotection
The hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both
10
Manufacturer ID: AMD
Device ID:
Am29F002B/Am29F002NB
(Top Boot Block)
Device ID:
Am29F002B/Am29F002NB
(Bottom Boot Block)
Sector Protection Verification
Sector
SA0
SA1
SA2
SA3
SA4
SA5
SA6
Description
Table 3. Am29F002B/Am29F002NB Bottom Boot Block Sector Address Table
Table 4. Am29F002B/Am29F002NB Autoselect Codes (High Voltage Method)
A17
ID
IL
0
0
0
0
0
1
1
, H = Logic High = V
on address pin A9. Address pins A6,
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
Am29F002B/Am29F002NB
WE#
H
H
H
H
H
H
A14
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
on the appropriate highest order address bits. Refer to
the corresponding Sector Address 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 programming
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.
program and erase operations in previously protected
sectors.
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
A1
H
L
L
L
(in hexadecimal)
08000h–0FFFFh
10000h–1FFFFh
20000h–2FFFFh
30000h–3FFFFh
Address Range
00000h–03FFFh
04000h–05FFFh
06000h–07FFFh
November 28, 2000
A0
H
H
L
L
(unprotected)
(protected)
DQ7
DQ0
B0h
01h
34h
01h
00h
to
ID
. See