Sector/Sector Block Protection and
Unprotection
Sector/
Sector Block Size
Sector
A21–A12
SA99–SA102
SA103–SA106
SA107–SA110
SA111–SA114
SA115–SA118
SA119–SA122
SA123–SA126
SA127–SA130
10111XXXXX
11000XXXXX
11001XXXXX
11010XXXXX
11011XXXXX
11100XXXXX
11101XXXXX
11110XXXXX
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
(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
6).
The hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both pro-
gram and erase operations in previously protected
sectors. Sector protection/unprotection can be imple-
mented via two methods.
1111100XXX,
1111101XXX,
1111110XXX
SA131–SA133
192 (3x64) Kbytes
SA134
SA135
SA136
SA137
SA138
SA139
SA140
SA141
1111111000
1111111001
1111111010
1111111011
1111111100
1111111101
1111111110
1111111111
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
Table 6. Am29DL640H Boot Sector/Sector Block
Addresses for Protection/Unprotection
Sector/
Sector
SA0
SA1
SA2
SA3
SA4
SA5
SA6
SA7
A21–A12
Sector Block Size
0000000000
0000000001
0000000010
0000000011
0000000100
0000000101
0000000110
0000000111
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
Sector protect/Sector Unprotect requires VID on the
RESET# pin only, and can be implemented either
in-system or via programming equipment. Figure 2
shows the algorithms and Figure 26 shows the timing
diagram. For sector unprotect, all unprotected sectors
must first be protected prior to the first sector unpro-
tect write cycle. Note that the sector unprotect algo-
rithm unprotects all sectors in parallel. All previously
protected sectors must be individually re-protected. To
change data in protected sectors efficiently, the tem-
porary sector unprotect function is available. See
“Temporary Sector Unprotect”.
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
0000001XXX,
0000010XXX,
0000011XXX,
SA8–SA10
192 (3x64) Kbytes
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
00001XXXXX
00010XXXXX
00011XXXXX
00100XXXXX
00101XXXXX
00110XXXXX
00111XXXXX
01000XXXXX
01001XXXXX
01010XXXXX
01011XXXXX
01100XXXXX
01101XXXXX
01110XXXXX
01111XXXXX
10000XXXXX
10001XXXXX
10010XXXXX
10011XXXXX
10100XXXXX
10101XXXXX
10110XXXXX
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors 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 is pro-
tected or unprotected. See the Autoselect Mode sec-
tion for details.
Write Protect (WP#)
The Write Protect function provides a hardware
method of protecting without using VID. This function is
one of two provided by the WP#/ACC pin.
If the system asserts VIL on the WP#/ACC pin, the de-
vice disables program and erase functions in sectors
0, 1, 140, and 141, independently of whether those
sectors were protected or unprotected using the
method described in “Sector/Sector Block Protection
and Unprotection”.
June 7, 2005
Am29DL640H
15
SPANSION [ SPANSION ]
