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參數(shù)資料
| 型號： | Am29LV641DH120RZE |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | 8 Characters x 2 Lines, 5x7 Dot Matrix Character and Cursor |
| 中文描述： | 64兆位（4個M x 16位），3.0伏的CMOS只均勻部門閃光控制記憶與VersatileI |
| 文件頁數(shù)： | 18/57頁 |
| 文件大?。?/td> | 1467K |
| 代理商： | AM29LV641DH120RZE |
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September 20, 2002
Am29LV640D/Am29LV641D
17
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.
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: LV640DU/H/L,
LV641DH/L
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)
SecSi Sector Indicator Bit
(DQ7), WP# protects
highest address sector
(LV640DH/641DH), or
no WP# (LV640DU)
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
(LV640DL/641DL)
L
L
H
X
X
V
ID
X
L
X
H
H
XX88h (factory locked),
XX08h (not factory locked)
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