Sector/Sector Block Protection and
Unprotection
The hardware sector protection feature disables
both program and erase operations in any sec-
tor. The hardware sector unprotection feature
re-enables both program and erase operations
in previously protected sectors. Sector protec-
tion/unprotection can be implemented via two
methods.
(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 unpro-
tected at the same tim e (see
Table 7 , on
page 17
and
Table 8, on page 17).
Addresses for Protection/Unprotection
Sector / Sector
Block
SA0-SA3
SA4-SA7
SA8-SA11
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-SA62
SA63
SA64
SA65
SA66
SA67
SA68
SA69
SA70
A20–A12
000000XXX,
000001XXX,
000010XXX
000011XXX
0001XXXXX
0010XXXXX
0011XXXXX
0100XXXXX
0101XXXXX
0110XXXXX
0111XXXXX
1000XXXXX
1001XXXXX
1010XXXXX
1011XXXXX
1100XXXXX
1101XXXXX
1110XXXXX
111100XXX,
111101XXX,
111110XXX
111111000
111111001
111111010
111111011
111111100
111111101
111111110
111111111
Sector/Sector Block
Size
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
192 (3x64) Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
Table 8. Bottom Boot Sector/Sector Block
Addresses for Protection/Unprotection
Sector / Sector
Block
SA70-SA67
SA66-SA63
SA62-SA59
SA58-SA55
SA54-SA51
SA50-SA47
SA46-SA43
SA42-SA39
SA38-SA35
SA34-SA31
SA30-SA27
SA26-SA23
SA22–SA19
SA18-SA15
SA14-SA11
SA10-SA8
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
A20–A12
111111XXX,
111110XXX,
111101XXX,
111100XXX
1110XXXXX
1101XXXXX
1100XXXXX
1011XXXXX
1010XXXXX
1001XXXXX
1000XXXXX
0111XXXXX
0110XXXXX
0101XXXXX
0100XXXXX
0011XXXXX
0010XXXXX
0001XXXXX
000011XXX,
000010XXX,
000001XXX
000000111
000000110
000000101
000000100
000000011
000000010
000000001
000000000
Sector/Sector Block
Size
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
192 (3x64) Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
Sector Protection and unprotection requires V
ID
on the RESET# pin only, and can be imple-
mented either in-system or via programming
equipment.
Figure 2, on page 19
shows the al-
gorithms and
shows the
timing diagram. This method uses standard mi-
croprocessor bus cycle timing. For sector un-
protect, all unprotected sectors must first be
protected prior to the first sector unprotect
write cycle.
The sector unprotect algorithm unprotects all
sectors in parallel. All previously protected sec-
tors must be individually re-protected. To
change data in protected sectors efficiently, the
temporary sector unprotect function is avail-
able. See
“Temporary Sector Unprotect” on
page 18.
The alternate method intended only for pro-
gramming equipment, and requires V
ID
on ad-
dress pin A9 and OE#. This method is
November 15, 2004
Am29LV320D
17
SPANSION [ SPANSION ]
