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參數(shù)資料
| 型號： | AM29LV652DU90RMAI |
| 廠商： | SPANSION LLC |
| 元件分類： | DRAM |
| 英文描述： | Varistor; Package/Case:0805; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):Yes; Supply Voltage Max:14V; Output Current Max:0.75A; Output Voltage Max:32V |
| 中文描述： | 16M X 8 FLASH 3V PROM, 90 ns, PBGA63 |
| 封裝： | 11 X 12 MM, 0.80 MM PITCH, FBGA-63 |
| 文件頁數(shù)： | 22/55頁 |
| 文件大?。?/td> | 1181K |
| 代理商： | AM29LV652DU90RMAI |
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20
Am29LV652D
October 29, 2004
P R E L I M I N A R Y
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
Table 5
). The hardware sector
group unprotection feature re-enables both program
and erase operations in previously protected sector
groups. Sector group protection/unprotection can be
implemented via two methods.
The primary method requires V
ID
on RESET# only,
and can be implemented either in-system or via pro-
gramming equipment.
Figure 2, on page 22
shows the
algorithms and
Figure 22, on page 47
shows the tim-
ing diagram. This method uses standard microproces-
sor bus cycle timing. For sector group unprotect, all
unprotected sector groups must first be protected prior
to the first sector group unprotect write cycle.
Some earlier 3.0 volt-only AMD flash devices used a
sector protection/unprotection method intended only
for programming equipment, and required V
ID
on ad-
dress A9 and OE#. If this earlier method is required for
the intended application, contact AMD for further de-
tails.
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”
on page 19
section for details.
Table 5.
Sector Group Protection/Unprotection
Address Table
Note:
All sector groups are 256 Kbytes in size.
Sector Group
A22–A18
SA0–SA3
00000
SA4–SA7
00001
SA8–SA11
00010
SA12–SA15
00011
SA16–SA19
00100
SA20–SA23
00101
SA24–SA27
00110
SA28–SA31
00111
SA32–SA35
01000
SA36–SA39
01001
SA40–SA43
01010
SA44–SA47
01011
SA48–SA51
01100
SA52–SA55
01101
SA56–SA59
01110
SA60–SA63
01111
SA64–SA67
10000
SA68–SA71
10001
SA72–SA75
10010
SA76–SA79
10011
SA80–SA83
10100
SA84–SA87
10101
SA88–SA91
10110
SA92–SA95
10111
SA96–SA99
11000
SA100–SA103
11001
SA104–SA107
11010
SA108–SA111
11011
SA112–SA115
11100
SA116–SA119
11101
SA120–SA123
11110
SA124–SA127
11111
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