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參數(shù)資料
| 型號： | AM29LV641GH35EI |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 64 Megabit (4 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O⑩ Control |
| 中文描述： | 64兆位（4個M x 16位）的CMOS 3.0伏特，只有統(tǒng)一閃存部門與VersatileI /輸出⑩控制 |
| 文件頁數(shù)： | 18/55頁 |
| 文件大?。?/td> | 719K |
| 代理商： | AM29LV641GH35EI |
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19
Am29LV641G
June 14, 2005
A D V A N C E I N F O R M A T I O N
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.
When using programming equipment, the autoselect
mode requires V
ID
(8.5 V to 12.5 V) on address pin A9.
Address pins A6, A1, and A0 must be as shown in
Table 3. In addition, when verifying sector protection,
the sector address must appear on the appropriate
highest order address bits (see Table 2). Table 3
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.
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
. Refer to the Autoselect Com-
mand Sequence section for more information.
Table 3.
Autoselect Codes, (High Voltage Method)
Legend:
L = Logic Low = V
IL
, H = Logic High = V
IH
, SA = Sector Address, X = Don’t care.
Note:
SecSi Sector Indicator Bit (DQ7) exist only in the Am29LV641GH/L devices.
Description
CE#
OE#
WE#
A21
to
A15
A14
to
A10
A9
A8
to
A7
A7
to
A0
A6
A5
to
A2
A1
A0
DQ15
to
DQ0
Manufacturer ID
:
AMD
L
L
H
X
X
V
ID
X
—
L
X
L
L
XX01h
A
Read Cycle 1
L
L
H
X
X
V
ID
X
—
L
X
L
H
22D7h
Read Cycle 2
L
L
H
X
X
V
ID
0Eh
L
L
H
220Fh
Read Cycle 3
L
L
H
X
X
V
ID
0Fh
L
L
H
XX00h
Sector Protection
Verification
L
L
H
SA
X
V
ID
X
—
L
X
H
L
01h (protected),
00h (unprotected)
SecSi
Sector
Indicator Bit (DQ7)
L
L
H
X
X
V
ID
X
—
L
X
H
H
98h (factory locked),
18h (not factory locked)
SecSi
Sector
Indicator Bit (DQ7),
WP# protects highest
address sector
L
L
H
X
X
V
ID
X
—
L
X
H
H
XX98h (factory locked),
XX18h (not factory
locked)
SecSi
Sector
Indicator Bit (DQ7),
WP# protects lowest
address sector
L
L
H
X
X
V
ID
X
—
L
X
H
H
XX88h (factory locked),
XX08h (not factory
locked)
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