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AM41DL1624DB30IT ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 20 Page - Advanced Micro Devices

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์ƒ์„ธ๋‚ด์šฉ  16 Megabit (2 M x 8-Bit/1 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (512 K x 8-Bit/256 K x 16-Bit) Static RAM
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AM41DL1624DB30IT ๋ฐ์ดํ„ฐ์‹œํŠธ(HTML) 20 Page - Advanced Micro Devices

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Am41DL16x4D
19
P R E L IMINARY
Autoselect Mode
The autoselect mode provides manufacturer and de-
vice identification, and sector protection verification,
through identifier codes output on DQ7โ€“DQ0. The au-
toselect codes can be accessed in-system through the
command register. Refer to the Autoselect Command
Sequence section for more information.Sector/Sector
Block Protection and Unprotection
(Note: For the following discussion, the term โ€œsectorโ€
applies to both sectors and sector blocks. A sector
block consists of two or more adjacent sectors that are
protected or unprotected at the same time (see Tables
10 and 11).
Table 10.
Top Boot Sector/Sector Block
Addresses for Protection/Unprotection
Table 11.
Bottom Boot Sector/Sector Block
Addresses for 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 and unprotection can be im-
plemented as follows.
Sector protection/unprotection requires V
ID on the RE-
SET# pi n only, and c an be i mplem ented ei th er
in-system or via programming equipment. Figure 2
shows the algorithms and Figure 26 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. Note that the sector unprotect
algorithm unprotects all sectors in parallel. All previ-
o u s l y pr ot e c te d s e c t or s m u s t be i n d i v i du al l y
re-protected. To change data in protected sectors effi-
ciently, the temporary sector un protect function is
available. See โ€œ Temporary Sector/Sector B lock
Unprotectโ€.
The device is shipped with all sectors unprotected.
It is possible to determine whether a sector is pro-
tected or unprotected. See the Autoselect Mode
section for details.
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting certain boot sectors without
using V
ID. This function is one of two provided by the
WP#/ACC pin.
Sector / Sector
Block
A19โ€“A12
Sector / Sector Block Size
SA0
00000XXX
64 Kbytes
SA1-SA3
00001XXX,
00010XXX,
00011XXX
192 (3x64) Kbytes
SA4-SA7
001XXXXX
256 (4x64) Kbytes
SA8-SA11
010XXXXX
256 (4x64) Kbytes
SA12-SA15
011XXXXX
256 (4x64) Kbytes
SA16-SA19
100XXXXX
256 (4x64) Kbytes
SA20-SA23
101XXXXX
256 (4x64) Kbytes
SA24-SA27
110XXXXX
256 (4x64) Kbytes
SA28-SA30
11100XXX,
11101XXX,
11110XXX
192 (3x64) Kbytes
SA31
11111000
8 Kbytes
SA32
11111001
8 Kbytes
SA33
11111010
8 Kbytes
SA34
11111011
8 Kbytes
SA35
11111100
8 Kbytes
SA36
11111101
8 Kbytes
SA37
11111110
8 Kbytes
SA38
11111111
8 Kbytes
Sector / Sector
Block
A19โ€“A12
Sector / Sector Block Size
SA38
11111XXX
64 Kbytes
SA37-SA35
11110XXX,
11101XXX,
11100XXX
192 (3x64) Kbytes
SA34-SA31
110XXXXX
256 (4x64) Kbytes
SA30-SA27
101XXXXX
256 (4x64) Kbytes
SA26-SA23
100XXXXX
256 (4x64) Kbytes
SA22-SA19
011XXXXX
256 (4x64) Kbytes
SA18-SA15
010XXXXX
256 (4x64) Kbytes
SA14-SA11
001XXXXX
256 (4x64) Kbytes
SA10-SA8
00001XXX,
00010XXX,
00011XXX
192 (3x64) Kbytes
SA7
00000111
8 Kbytes
SA6
00000110
8 Kbytes
SA5
00000101
8 Kbytes
SA4
00000100
8 Kbytes
SA3
00000011
8 Kbytes
SA2
00000010
8 Kbytes
SA1
00000001
8 Kbytes
SA0
00000000
8 Kbytes


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