D A T A S H E E T
Table 5. Am29BDS640H Boot Sector/Sector Block
Sector/
Addresses for Protection/Unprotection
Sector
SA135
SA136
SA137
SA138
SA139
SA140
SA141
A21–A12
Sector Block Size
1111111001
1111111010
1111111011
1111111100
1111111101
1111111110
1111111111
4 Kwords
4 Kwords
4 Kwords
4 Kwords
4 Kwords
4 Kwords
4 Kwords
Sector/
Sector
SA0
A21–A12
Sector Block Size
0000000000
0000000001
0000000010
0000000011
0000000100
0000000101
0000000110
0000000111
0000001XXX
0000010XXX
0000011XXX
00001XXXXX
00010XXXXX
00011XXXXX
00100XXXXX
00101XXXXX
00110XXXXX
00111XXXXX
01000XXXXX
01001XXXXX
01010XXXXX
01011XXXXX
01100XXXXX
01101XXXXX
01110XXXXX
01111XXXXX
10000XXXXX
10001XXXXX
10010XXXXX
10011XXXXX
10100XXXXX
10101XXXXX
10110XXXXX
10111XXXXX
11000XXXXX
11001XXXXX
11010XXXXX
11011XXXXX
11100XXXXX
11101XXXXX
11110XXXXX
1111100XXX
1111101XXX
1111110XXX
1111111000
4 Kwords
SA1
4 Kwords
SA2
4 Kwords
SA3
4 Kwords
SA4
4 Kwords
Sector/Sector Block Protection and Un-
protection
SA5
4 Kwords
SA6
4 Kwords
SA7
4 Kwords
The hardware sector protection feature disables both
programming and erase operations in any sector. The
hardware sector unprotection feature re-enables both
program and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented via two methods.
SA8
32 Kwords
SA9
32 Kwords
SA10
32 Kwords
SA11–SA14
SA15–SA18
SA19–SA22
SA23-SA26
SA27-SA30
SA31-SA34
SA35-SA38
SA39-SA42
SA43-SA46
SA47-SA50
SA51–SA54
SA55–SA58
SA59–SA62
SA63–SA66
SA67–SA70
SA71–SA74
SA75–SA78
SA79–SA82
SA83–SA86
SA87–SA90
SA91–SA94
SA95–SA98
SA99–SA102
SA103–SA106
SA107–SA110
SA111–SA114
SA115–SA118
SA119–SA122
SA123–SA126
SA127–SA130
SA131
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
32 Kwords
(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 4,
“Am29BDS128H Boot Sector/Sector Block Addresses
for Protection/Unprotection,” on page 16
Sector Protection
The Am29BDSxxxH family features several levels of
sector protection, which can disable both the program
and erase operations in certain sectors or sector
groups:
Persistent Sector Protection
A command sector protection method that replaces
the old 12 V controlled protection method.
Password Sector Protection
A highly sophisticated protection method that requires
a password before changes to certain sectors or sec-
tor groups are permitted
WP# Hardware Protection
A write protect pin that can prevent program or erase
operations in the outermost sectors.
The WP# Hardware Protection feature is always avail-
able, independent of the software managed protection
method chosen.
Selecting a Sector Protection Mode
All parts default to operate in the Persistent Sector
Protection mode. The customer must then choose if
the Persistent or Password Protection method is most
desirable. There are two one-time programmable
non-volatile bits that define which sector protection
method will be used. If the customer decides to con-
tinue using the Persistent Sector Protection method,
they must set the Persistent Sector Protection Mode
SA132
32 Kwords
SA133
32 Kwords
SA134
4 Kwords
May 10, 2006 27024B3
Am29BDS128H/Am29BDS640H
17
SPANSION [ SPANSION ]
