參數(shù)資料
型號(hào)： AM42DL3234GT30IT
廠商： Advanced Micro Devices, Inc.
英文描述： 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
中文描述： 32兆位（4個(gè)M × 8位/ 2米x 16位），3.0伏的CMOS只，同時(shí)作業(yè)閃存和4兆位（256畝× 16位），靜態(tài)存儲(chǔ)器
文件頁數(shù)： 20/64頁
文件大?。?/td> 557K
代理商： AM42DL3234GT30IT
20
Am42DL32x4G
May 19, 2003
P R E L I M I N A R Y
Table 9.
Addresses for Protection/Unprotection
Bottom 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 1
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”.
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
8).
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 V
ID
(11.5 V – 12.5 V). During this mode,
formerly protected sectors can be programmed or
erased by selecting the sector addresses. Once V
ID
is
removed from the RESET# pin, all the previously pro-
tected sectors are protected again. Figure 1 shows the
algorithm, and Figure 25 shows the timing diagrams,
for this feature.
Sector
A20–A12
Sector/Sector Block
Size
SA70
111111XXX
64 Kbytes
SA69-SA67
111110XXX,
111101XXX,
111100XXX
192 (3x64) Kbytes
SA66-SA63
1110XXXXX
256 (4x64) Kbytes
SA62-SA59
1101XXXXX
256 (4x64) Kbytes
SA58-SA55
1100XXXXX
256 (4x64) Kbytes
SA54-SA51
1011XXXXX
256 (4x64) Kbytes
SA50-SA47
1010XXXXX
256 (4x64) Kbytes
SA46-SA43
1001XXXXX
256 (4x64) Kbytes
SA42-SA39
1000XXXXX
256 (4x64) Kbytes
SA38-SA35
0111XXXXX
256 (4x64) Kbytes
SA34-SA31
0110XXXXX
256 (4x64) Kbytes
SA30-SA27
0101XXXXX
256 (4x64) Kbytes
SA26-SA23
0100XXXXX
256 (4x64) Kbytes
SA22–SA19
0011XXXXX
256 (4x64) Kbytes
SA18-SA15
0010XXXXX
256 (4x64) Kbytes
SA14-SA11
0001XXXXX
256 (4x64) Kbytes
SA10-SA8
000011XXX,
000010XXX,
000001XXX
192 (3x64) Kbytes
SA7
000000111
8 Kbytes
SA6
000000110
8 Kbytes
SA5
000000101
8 Kbytes
SA4
000000100
8 Kbytes
SA3
000000011
8 Kbytes
SA2
000000010
8 Kbytes
SA1
000000001
8 Kbytes
SA0
000000000
8 Kbytes
相關(guān)PDF資料
PDF描述
AM42DL3234GT35IT 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
AM42DL3234GT40IT 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
AM42DL3234GT55IT 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
AM42DL3234GT70IT 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
AM42DL3234GT71IT 32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AM42DL3234GT35IT 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
AM42DL3234GT40IT 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
AM42DL3234GT55IT 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
AM42DL3234GT70IT 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
AM42DL3234GT71IT 制造商:AMD 制造商全稱:Advanced Micro Devices 功能描述:32 Megabit (4 M x 8-Bit/2 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Operation Flash Memory and 4 Mbit (256 K x 16-Bit) Static RAM
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