參數(shù)資料
型號： AM41DL32X4GT70IS
廠商： Spansion Inc.
元件分類： DRAM
英文描述： Stacked Multi-Chip Package (MCP) Flash Memory and SRAM
中文描述： 堆疊式多芯片封裝（MCP）閃存和SRAM
文件頁數(shù)： 22/65頁
文件大小： 1190K
代理商： AM41DL32X4GT70IS
November 12, 2001
Am41DL32x4G
21
P R E L I M I N A R Y
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 automatically match a device to be
programmed with its corresponding programming
algorithm.
The autoselect codes can also be accessed in-system
through the command register. The host system can
issue the autoselect command via the command regis-
ter, as shown in Tables 15 and 17. This method does
not require V
ID
. Refer to the Autoselect Command Se-
quence 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
10).
Table 10.
Addresses for Protection/Unprotection
Top Boot Sector/Sector Block
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. Note that the sector unprotect algorithm un-
protects all sectors in parallel. All previously protected
sectors must be individually re-protected. To change
data in protected sectors efficiently, the temporary
sector un protect function is available. See
“
Temporary
Sector/Sector Block Unprotect
”
.
Sector protection and unprotection can be imple-
mented as follows.
Sector protection and unprotection requires V
ID
on the
RESET# 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.
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 top-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
”
.
Sector
A20
–
A12
Sector/
Sector Block Size
SA0
000000XXX
64 Kbytes
SA1-SA3
000001XXX,
000010XXX
000011XXX
192 (3x64) Kbytes
SA4-SA7
0001XXXXX
256 (4x64) Kbytes
SA8-SA11
0010XXXXX
256 (4x64) Kbytes
SA12-SA15
0011XXXXX
256 (4x64) Kbytes
SA16-SA19
0100XXXXX
256 (4x64) Kbytes
SA20-SA23
0101XXXXX
256 (4x64) Kbytes
SA24-SA27
0110XXXXX
256 (4x64) Kbytes
SA28-SA31
0111XXXXX
256 (4x64) Kbytes
SA32-SA35
1000XXXXX
256 (4x64) Kbytes
SA36-SA39
1001XXXXX
256 (4x64) Kbytes
SA40-SA43
1010XXXXX
256 (4x64) Kbytes
SA44-SA47
1011XXXXX
256 (4x64) Kbytes
SA48-SA51
1100XXXXX
256 (4x64) Kbytes
SA52-SA55
1101XXXXX
256 (4x64) Kbytes
SA56-SA59
1110XXXXX
256 (4x64) Kbytes
SA60-SA62
111100XXX,
111101XXX,
111110XXX
192 (4x64) Kbytes
SA63
111111000
8 Kbytes
SA64
111111001
8 Kbytes
SA65
111111010
8 Kbytes
SA66
111111011
8 Kbytes
SA67
111111100
8 Kbytes
SA68
111111101
8 Kbytes
SA69
111111110
8 Kbytes
SA70
111111111
8 Kbytes
Sector
A20
–
A12
Sector/
Sector Block Size
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