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DS42514 데이터시트(HTML) 15 Page - Advanced Micro Devices

부품명 DS42514
상세내용  Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
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제조사  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

DS42514 데이터시트(HTML) 15 Page - Advanced Micro Devices

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DS42514
15
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 autom atic ally ma tch a dev ice to b e
programmed with its corresponding programming al-
gorithm. However, the autoselect codes can also be
accessed in-system through the command register.
To access the autoselect codes in-system, the host
system can issue the autoselect command via the
command register, as shown in Table 12. This method
does not require V
ID. Refer to the Autoselect Com-
mand Sequence section for more information.
Sector/Sector Block Protection and
Unprotection
(Note: For the following discussion, the term “sector”
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 Table
7).
Table 7.
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# pin only, and can be implemented either
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-
ous ly pr otected se ctor s must be i ndiv i dua lly
re-protected. To change data in protected sectors effi-
ciently, the temporary sector un protect function is
available. See “Temporary Sector/Sector Block
Unprotect”.
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.
If the system asserts V
IL on the WP#/ACC pin, the de-
vice disables program and erase functions in the two
“outermost” 8 Kbyte boot sectors independently of
whether those sectors were protected or unprotected
using the method described in “Sector/Sector Block
Protection and Unprotection”. The two outermost 8
Kbyte boot sectors are the two sectors containing the
lowest addresses in a bottom-boot-configured device,
or the two sectors containing the highest addresses in
a top-boot-configured device.
If the system asserts V
IH on the WP#/ACC pin, the de-
vice reverts to whether the two outermost 8 Kbyte boot
sectors were last set to be protected or unprotected.
That is, sector protection or unprotection for these two
sectors depends on whether they were last protected
or unprotected using the method described in “Sec-
tor/Sector Block Protection and Unprotection”.
Note that the WP#/ACC pin must not be left floating or
unconnected; inconsistent behavior of the device may
result.
Temporary Sector/Sector Block Unprotect
(Note: For the following discussion, the term “sector”
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 Table
7).
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-
Sector / Sector
Block
A19–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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