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AM29SL400CB100REF 数据表(PDF) 14 Page - Advanced Micro Devices

部件名 AM29SL400CB100REF
功能描述  4 Megabit (512 K x 8-Bit/256 K x 16-Bit) CMOS 1.8 Volt-only Super Low Voltage Flash Memory
PDF  44 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM29SL400CB100REF 数据表(HTML) 14 Page - Advanced Micro Devices

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12
Am29SL400C
Am29SL400C_00_A6 January 23, 2007
D A TA
SH EE T
Table 4.
Am29SL400C Autoselect Codes (High Voltage Method)
L = Logic Low = VIL, H = Logic High = VIH, SA = Sector Address, X = Don’t care.
Sector Protection/Unprotection
The hardware sector protection feature disables both pro-
gram and erase operations in any sector. The hardware sec-
tor unprotection feature re-enables both program and erase
operations in previously protected sectors. Sector protec-
tion/unprotection can be implemented via two methods.
Sector protection/unprotection requires VID on the RESET#
pin only, and can be implemented either in-system or via
programming equipment. Figure 2‚ on page 14 shows the al-
gorithms and Figure 24‚ on page 37 shows the timing dia-
gram. 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 cy-
cle.
The device is shipped with all sectors unprotected. AMD of-
fers the option of programming and protecting sectors at its
factory prior to shipping the device through AMD’s Express-
Flash™ Service. Contact an AMD representative for details.
It is possible to determine whether a sector is protected or
unprotected. See Autoselect Mode‚ on page 11 for details.
Temporary Sector Unprotect
This feature allows temporary unprotection of previously pro-
tected sectors to change data in-system. The Sector Unpro-
tect mode is activated by setting the RESET# pin to VID.
During this mode, formerly protected sectors can be pro-
grammed 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 3‚ on page 16
shows the algorithm, and Figure 22 shows the timing dia-
grams, for this feature.
Description
Mode
CE#
OE#
WE#
A17t
o
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
VID
X
L
X
L
L
X
01h
Device ID:
Am29SL400C
(Top Boot Block)
Word
L
L
H
XX
VID
XLX
L
H
22h
70h
Byte
L
L
H
X
70h
Device ID:
Am29SL400C
(Bottom Boot Block)
Word
L
L
H
XX
VID
XLX
L
H
22h
F1h
Byte
L
L
H
X
F1h
Sector Protection Verification
L
L
H
SA
X
VID
XLX
H
L
X
01h (protected)
X
00h
(unprotected)



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