am49lv128bm Meet Spansion Inc., am49lv128bm Datasheet - Page 21

• Manufacturer Part Number: am49lv128bm
• Description: Stacked Multi-chip Package Mcp ,128 Megabit 8 M ? 16-bit ,uniform Sector Flash Memory And 32 Mbit 2 M ? 16-bit Pseudo-static Ram With Page Mode Featuring Mirrorbit Technology,supplemental Datasheet
• Manufacturer: Meet Spansion Inc.

Sector Group Protection and
Unprotection
The hardware sector group protection feature disables
both program and erase operations in any sector
group. The hardware sector group unprotection fea-
ture re-enables both program and erase operations in
previously protected sector groups. Sector group pro-
tection/unprotection can be implemented via two
methods.
Sector group protection/unprotection requires V
the RESET# pin only, and can be implemented either
in-system or via programming equipment. Figure 2
shows the algorithms and Figure 24 shows the timing
diagram. This method uses standard microprocessor
bus cycle timing. For sector group unprotect, all unpro-
tected sector group 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 Sector Group Pro-
tection and Unprotection section for details.
June 17, 2004
Table 4. Sector Group Protection/Unprotection
Sector Group
SA12–SA15
SA16–SA19
SA20–SA23
SA24–SA27
SA28–SA31
SA32–SA35
SA36–SA39
SA40–SA43
SA44–SA47
SA48–SA51
SA52–SA55
SA56–SA59
SA60–SA63
SA64–SA67
SA68–SA71
SA72–SA75
SA76–SA79
SA8–SA11
SA4–SA7
SA0
SA1
SA2
SA3
Address Table
00000000
00000001
00000010
00000011
000001xx
000100xx
000101xx
001000xx
001001xx
001010xx
010000xx
010001xx
010010xx
A22–A15
000010xx
000011xx
000110xx
000111xx
001011xx
001100xx
001101xx
001110xx
010011xx
001111xx
Am49LV128BM
ID
on
SA100–SA103
SA104–SA107
SA120–SA123
SA124–SA127
SA128–SA131
SA132–SA135
SA136–SA139
SA140–SA143
SA144–SA147
SA148–SA151
SA152–SA155
SA156–SA159
SA160–SA163
SA164–SA167
SA168–SA171
SA172–SA175
SA176–SA179
SA180–SA183
SA184–SA187
SA188–SA191
SA192–SA195
SA196–SA199
SA200–SA203
SA204–SA207
SA212–SA215
SA216–SA219
SA220–SA223
SA224–SA227
SA228–SA231
SA232–SA235
SA236–SA239
SA240–SA243
SA244–SA247
SA248–SA251
SA108–SA111
SA112–SA115
SA116–SA119
SA208–SA211
Sector Group
SA80–SA83
SA84–SA87
SA88–SA91
SA92–SA95
SA96–SA99
SA252
SA253
SA254
SA255
A22–A15
010100xx
010101xx
010110xx
011000xx
011001xx
011010xx
100000xx
100001xx
100010xx
100011xx
100100xx
100101xx
100110xx
101000xx
101001xx
101010xx
101011xx
101100xx
101101xx
110000xx
110001xx
110010xx
110100xx
110101xx
010111xx
011011xx
011100xx
011101xx
011110xx
011111xx
100111xx
101110xx
101111xx
110011xx
110110xx
110111xx
111000xx
111001xx
111010xx
111011xx
111100xx
111101xx
11111100
11111101
111110xx
11111110
11111111
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