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AM29DL800B ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 16 Page - Advanced Micro Devices

๋ถ€ํ’ˆ๋ช… AM29DL800B
์ƒ์„ธ๋‚ด์šฉ  8 Megabit (1 M x 8-Bit/512 K x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory
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์ œ์กฐ์‚ฌ  AMD [Advanced Micro Devices]
ํ™ˆํŽ˜์ด์ง€  http://www.amd.com
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14
Am29DL800B
21519C4 December 4, 2006
D A TA
SH EET
Table 4.
Am29DL800B Autoselect Codes (High Voltage Method)
Note: L = Logic Low = VIL, H = Logic High = VIH, BA = Bank Address, SA = Sector Address, X = Donโ€™t care.
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
program and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented via two methods.
The primary method requires VID on the RESET# pin
only, and can be implemented either in-system or via
programming equipment. Figure 2 shows the algo-
rithms and Figure 24 shows the timing diagram. This
method uses standard microprocessor bus cycle tim-
ing. For sector unprotect, all unprotected sectors must
first be protected prior to the first sector unprotect write
cycle.
The alternate method intended only for programming
equipment requires VID on address pin A9 and OE#.
This method is compatible with programmer routines
written for earlier 3.0 volt-only AMD flash devices. Pub-
lication number 21467 contains further details; contact
an AMD representative to request a copy.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at its factory prior to shipping the device
through AMDโ€™s ExpressFlashโ„ข Service. Contact an
AMD representative for details.
It is possible to determine whether a sector is protected
or unprotected. See the Autoselect Mode section 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 RE-
SET# pin to VID (11.5 V โ€“ 12.5 V). During this mode,
formerly protected sectors can be programmed or
erased by selecting the sector addresses. Once VID is
removed from the RESET# pin, all the previously pro-
tected sectors are protected again. Figure 1 shows the
algorithm, and Figure 23 shows the timing diagrams,
for this feature.
Figure 1.
Temporary Sector Unprotect Operation
Description
Mode
CE#
OE#
WE#
A18
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
BA
X
VID
X
L
X
L
L
X
01h
Device ID:
Am29DL800B
(Top Boot Block)
Word
L
L
H
BA
X
VID
X
L
X
L
H
22h
4Ah
Byte
L
L
H
X
4Ah
Device ID:
Am29DL800B
(Bottom Boot Block)
Word
L
L
H
BA
X
VID
X
L
X
L
H
22h
CBh
Byte
L
L
H
X
CBh
Sector Protection Verification
L
L
H
SA
X
VID
X
L
X
H
L
X
01h
(protected)
X
00h
(unprotected)
START
Perform Erase or
Program Operations
RESET# = VIH
Temporary Sector
Unprotect Completed
(Note 2)
RESET# = VID
(Note 1)
Notes:
1. All protected sectors unprotected.
2. All previously protected sectors are protected once
again.


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