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參數(shù)資料
| 型號(hào)： | AM29SL400CT100RWAF |
| 廠商： | SPANSION LLC |
| 元件分類： | DRAM |
| 英文描述： | 4 Megabit (512 K x 8-Bit/256 K x 16-Bit) CMOS 1.8 Volt-only Super Low Voltage Flash Memory |
| 中文描述： | 256K X 16 FLASH 1.8V PROM, 100 ns, PBGA48 |
| 封裝： | 6 X 8 MM, 0.80 MM PITCH, LEAD FREE, FBGA-48 |
| 文件頁數(shù)： | 14/44頁 |
| 文件大小： | 945K |
| 代理商： | AM29SL400CT100RWAF |
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12
March 3, 2005
A d v a n c e I n f o r m a t i o n
priate highest order address bits (see
Table 2 on
page 11
and
Table 3 on page 11
).
Table 4
shows the
remaining address bits that are don’t care. When all
necessary bits have been set as required, the pro-
gramming 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 5 on page 18
.
This method does not require VID. See
Command
Definitions on page 18
for details on using the au-
toselect mode.
Table 4.
Am29SL400C Autoselect Codes (High Voltage Method)
L = Logic Low = V
IL
, H = Logic High = V
IH
, SA = Sector Address, X = Don’t care.
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
protected sectors. Sector protection/unprotection
can be implemented via two methods.
Sector protection/unprotection requires V
ID
on the
RESET# pin only, and can be implemented either
in-system or via programming equipment.
Figure 2
on page 14
shows the algorithms and
Figure 24 on
page 37
shows the timing diagram. This method
uses standard microprocessor bus cycle timing. For
sector unprotect, all unprotected sectors must first
be protected prior to the first sector unprotect write
cycle.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protect-
ing sectors at its factory prior to shipping the device
through AMD’s ExpressFlash Service. Contact an
AMD representative for details.
It is possible to determine whether a sector is pro-
tected or unprotected. See
Autoselect Mode on
page 11
for details.
Temporary Sector Unprotect
This feature allows temporary unprotection of previ-
ously protected sectors to change data in-system.
The Sector Unprotect mode is activated by setting
the RESET# pin to V
ID
. During this mode, formerly
protected sectors can be programmed or erased by
selecting the sector addresses. Once V
ID
is removed
from the RESET# pin, all the previously protected
sectors are protected again.
Figure 3 on page 16
shows the algorithm, and Figure 22 shows the timing
diagrams, for this feature.
Description
Mode
CE#
OE#
WE#
A17
to
A12
A11
to
A10
A9
A8
to
A7
A6
A5
to
A2
A1
A0
DQ8
to
DQ15
DQ7
to
DQ0
Manufacturer ID
:
AMD
L
L
H
X
X
V
ID
X
L
X
L
L
X
01h
Device ID:
Am29SL400C
(Top Boot Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
H
22h
70h
Byte
L
L
H
X
70h
Device ID:
Am29SL400C
(Bottom Boot
Block)
Word
L
L
H
X
X
V
ID
X
L
X
L
H
22h
F1h
Byte
L
L
H
X
F1h
Sector Protection
Verification
L
L
H
SA
X
V
ID
X
L
X
H
L
X
01h
(protected)
X
00h
(unprotected
)
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