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參數資料
| 型號： | L642DU12RI |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only Uniform Sector Flash Memory with VersatileI/O⑩ Control |
| 中文描述： | 128兆位（8米× 16位）的CMOS 3.0伏特，只有統一閃存部門與VersatileI /輸出⑩控制 |
| 文件頁數： | 21/54頁 |
| 文件大?。?/td> | 520K |
| 代理商： | L642DU12RI |
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May 5, 2006 25022A2
Am29LV642D
19
D A T A S H E E T
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 4. In addition, when verifying sector protection,
the sector address must appear on the appropriate
highest order address bits (see Table 2 and Table 3).
Table 4 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 Table 10. This method
does not require V
ID
. Refer to the Autoselect Com-
mand Sequence section for more information.
Table 4. Am29LV642D Autoselect Codes, (High Voltage Method)
Legend:
L = Logic Low = V
IL
, H = Logic High = V
IH
, SA = Sector Address, X = Don’t care.
Notes:
1. CE# can be replaced with CE2# when referring to the second die in the package.
2. The device ID’s used for the Am29LV642 are the same as the Am29LV640, because the Am29LV642 uses two Am29LV640
dice and appears to the system as two Am29LV640 devices.
Description
CE#
OE#
WE#
A21
to
A15
A14
to
A10
A9
A8
to
A7
A6
A5
to
A2
A1
A0
DQ15 to DQ0
Manufacturer ID
:
AMD
L
L
H
X
X
V
ID
X
L
X
L
L
0001h
Device ID: Am29LV642D
L
L
H
X
X
V
ID
X
L
X
L
H
22D7h
Sector Protection
Verification
L
L
H
SA
X
V
ID
X
L
X
H
L
XX01h (protected),
XX00h (unprotected)
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