P R E L I M I N A R Y
Table 9. Bottom Boot Sector/Sector Block
Addresses for Protection/Unprotection
Sector/Sector Block Protection and
Unprotection
Sector / Sector
Block
(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 Tables
8 and 9).
A19–A12
Sector / Sector Block Size
SA38
11111XXX
64 Kbytes
11110XXX,
11101XXX,
11100XXX
SA37-SA35
192 (3x64) Kbytes
SA34-SA31
SA30-SA27
SA26-SA23
SA22-SA19
SA18-SA15
SA14-SA11
110XXXXX
101XXXXX
100XXXXX
011XXXXX
010XXXXX
001XXXXX
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
Table 8. Top Boot Sector/Sector Block Addresses
for Protection/Unprotection
Sector / Sector
Block
A19–A12
Sector / Sector Block Size
SA0
00000XXX
64 Kbytes
00001XXX,
00010XXX,
00011XXX
SA1-SA3
192 (3x64) Kbytes
00001XXX,
00010XXX,
00011XXX
SA10-SA8
192 (3x64) Kbytes
SA4-SA7
SA8-SA11
SA12-SA15
SA16-SA19
SA20-SA23
SA24-SA27
001XXXXX
010XXXXX
011XXXXX
100XXXXX
101XXXXX
110XXXXX
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
256 (4x64) Kbytes
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
00000111
00000110
00000101
00000100
00000011
00000010
00000001
00000000
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
11100XXX,
11101XXX,
11110XXX
SA28-SA30
192 (3x64) Kbytes
SA31
SA32
SA33
SA34
SA35
SA36
SA37
SA38
11111000
11111001
11111010
11111011
11111100
11111101
11111110
11111111
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
8 Kbytes
The hardware sector protection feature disables both
program and erase operations in any sector. The hard-
ware sector unprotection feature re-enables both
program and erase operations in previously protected
sectors. Sector protection and unprotection can be im-
plemented via two methods.
The primary method requires VID on the RESET# pin
only, and can be implemented either in-system or via
programming equipment. Figure 2 shows the algo-
rithms and Figure 25 shows the timing diagram. This
method uses standard microprocessor bus cycle tim-
ing. For sector unprotect, all unprotected sectors must
first be protected prior to the first sector unprotect
write cycle.
The alternate method intended only for programming
equipment requires VID on address pin A9 and OE#.
This method is compatible with programmer routines
written for earlier 3.0 volt-only AMD flash devices.
Publication number 22243 contains further details;
contact an AMD representative to request a copy.
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
section for details.
Am29DL162C/Am29DL163C
14
SPANSION [ SPANSION ]
