參數(shù)資料
型號(hào)： AM29LV320MB90RPC
廠(chǎng)商： Advanced Micro Devices, Inc.
英文描述： 32 Megabit (2 M x 16-Bit/4 M x 8-Bit) MirrorBit 3.0 Volt-only Boot Sector Flash Memory
中文描述： 32兆位（2米× 16位/ 4米× 8位）的MirrorBit 3.0伏，只引導(dǎo)扇區(qū)閃存
文件頁(yè)數(shù)： 17/61頁(yè)
文件大?。?/td> 1395K
代理商： AM29LV320MB90RPC
May 16, 2003
Am29LV320MT/B
17
D A T A S H E E T
Sector Group Protection and
Unprotection
The hardware sector group protection feature disables
both program and erase operations in any sector
group. In this device, a sector group consists of four
adjacent sectors that are protected or unprotected at
the same time (see Tables
5
and
6
). The hardware
sector group unprotection feature re-enables both pro-
gram and erase operations in previously protected
sector groups. Sector group protection/unprotection
can be implemented via two methods.
Sector protection/unprotection requires V
ID
on the RE-
SET# pin only, and can be implemented either in-sys-
tem or via programming equipment. Figure 2 shows
the algorithms and Figure 24 shows the timing dia-
gram. This method uses standard microprocessor bus
cycle timing. For sector group unprotect, all unpro-
tected sector groups must first be protected prior to
the first sector group unprotect write cycle.
The device is shipped with all sector groups unpro-
tected. AMD offers the option of programming and
protecting sector groups at its factory prior to shipping
the device through AMD’s ExpressFlash Service.
Contact an AMD representative for details.
It is possible to determine whether a sector group is
protected or unprotected. See the
Autoselect Mode
section for details.
Table 5.
Am29LV320MT Top Boot
Sector Protection
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting the top two or bottom two sectors
without using V
ID
. WP# is one of two functions pro-
vided by the WP#/ACC input.
If the system asserts V
IL
on the WP#/ACC pin, the de-
vice disables program and erase functions in the first
or last sector independently of whether those sectors
were protected or unprotected using the method de-
scribed in “Sector Group Protection and Unprotection”.
Note that if WP#/ACC is at V
IL
when the device is in
the standby mode, the maximum input load current is
increased. See the table in “DC Characteristics”.
Sector
A20–A12
Sector/
Sector Block Size
SA0-SA3
0000XXXXXh
256 (4x64) Kbytes
SA4-SA7
0001XXXXXh
256 (4x64) Kbytes
SA8-SA11
0010XXXXXh
256 (4x64) Kbytes
SA12-SA15
0011XXXXXh
256 (4x64) Kbytes
SA16-SA19
0100XXXXXh
256 (4x64) Kbytes
SA20-SA23
0101XXXXXh
256 (4x64) Kbytes
SA24-SA27
0110XXXXXh
256 (4x64) Kbytes
SA28-SA31
0111XXXXXh
256 (4x64) Kbytes
SA32–SA35
1000XXXXXh,
256 (4x64) Kbytes
SA36–SA39
1001XXXXXh
256 (4x64) Kbytes
SA40–SA43
1010XXXXXh
256 (4x64) Kbytes
SA44–SA47
1011XXXXXh
256 (4x64) Kbytes
SA48–SA51
1100XXXXXh
256 (4x64) Kbytes
SA52-SA55
1101XXXXXh
256 (4x64) Kbytes
SA56-SA59
1110XXXXXh
256 (4x64) Kbytes
SA60-SA62
111100XXXh
111101XXXh
111110XXXh
192 (3x64) Kbytes
SA63
111111000h
8 Kbytes
SA64
111111001h
8 Kbytes
SA65
111111010h
8 Kbytes
SA66
111111011h
8 Kbytes
SA67
111111100h
8 Kbytes
SA68
111111101h
8 Kbytes
SA69
111111110h
8 Kbytes
SA70
111111111h
8 Kbytes
Table 6.
Am29LV320MB Bottom Boot
Sector Protection
Sector
A20–A12
Sector/
Sector Block Size
SA0
000000000h
8 Kbytes
SA1
000000001h
8 Kbytes
SA2
000000010h
8 Kbytes
SA3
000000011h
8 Kbytes
SA4
000000100h
8 Kbytes
SA5
000000101h
8 Kbytes
SA6
000000110h
8 Kbytes
SA7
000000111h
8 Kbytes
SA8–SA10
000001XXXh,
000010XXXh,
000011XXXh,
192 (3x64) Kbytes
SA11–SA14
0001XXXXXh
256 (4x64) Kbytes
SA15–SA18
0010XXXXXh
256 (4x64) Kbytes
SA19–SA22
0011XXXXXh
256 (4x64) Kbytes
SA23–SA26
0100XXXXXh
256 (4x64) Kbytes
SA27-SA30
0101XXXXXh
256 (4x64) Kbytes
SA31-SA34
0110XXXXXh
256 (4x64) Kbytes
SA35-SA38
0111XXXXXh
256 (4x64) Kbytes
SA39-SA42
1000XXXXXh
256 (4x64) Kbytes
SA43-SA46
1001XXXXXh
256 (4x64) Kbytes
SA47-SA50
1010XXXXXh
256 (4x64) Kbytes
SA51-SA54
1011XXXXXh
256 (4x64) Kbytes
SA55–SA58
1100XXXXXh
256 (4x64) Kbytes
SA59–SA62
1101XXXXXh
256 (4x64) Kbytes
SA63–SA66
1110XXXXXh
256 (4x64) Kbytes
SA67–SA70
1111XXXXXh
256 (4x64) Kbytes
Sector
A20–A12
Sector/
Sector Block Size
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