Document Number: 002-00856 Rev. *E
S29JL064J
Sector Protect/Sector Unprotect requires V
ID
on the RESET# pin only, and can be implemented either in-system or via programming
equipment.
shows the algorithms and
shows the timing diagram. For sector
unprotect, all unprotected sectors must first be protected prior to the first sector unprotect write cycle.
Note that the sector unprotect
algorithm unprotects all sectors in parallel. All previously protected sectors must be individually re-protected.
To change data in
protected sectors efficiently, the temporary sector unprotect function is available. See
.
The device is shipped with all sectors unprotected. Optional Spansion programming service enable programming and protecting
sectors at the factory prior to shipping the device. Contact your local sales office for details.
It is possible to determine whether a sector is protected or unprotected. See
for details.
8.11
Write Protect (WP#)
The Write Protect function provides a hardware method of protecting without using V
ID
. This function is one of two provided by the
WP#/ACC pin.
If the system asserts V
IL
on the WP#/ACC pin, the device 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
.
If the system asserts V
IH
on the WP#/ACC pin, the device reverts to whether sectors 0, 1, 140, and 141 were last set to be protected
or unprotected. That is, sector protection or unprotection for these sectors depends on whether they were last protected or
unprotected using the method described in
Boot Sector/Sector Block Protection and Unprotection
Note that the WP#/ACC pin must not be left floating or unconnected; inconsistent behavior of the device may result.
SA127–SA130
11110XXXXX
256 (4x64) kbytes
SA131–SA133
1111100XXX,
1111101XXX,
1111110XXX
192 (3x64) kbytes
SA134
1111111000
8 kbytes
SA135
1111111001
8 kbytes
SA136
1111111010
8 kbytes
SA137
1111111011
8 kbytes
SA138
1111111100
8 kbytes
SA139
1111111101
8 kbytes
SA140
1111111110
8 kbytes
SA141
1111111111
8 kbytes
WP#/ACC Modes
WP# Input Voltage
Device Mode
V
IL
Disables programming and erasing in SA0, SA1, SA140, and SA141
V
IH
Enables programming and erasing in SA0, SA1, SA140, and SA141, dependent on whether they were last
protected or unprotected.
V
HH
Enables accelerated programming (ACC).
S29JL064J Boot Sector/Sector Block Addresses for Protection/Unprotection (Sheet 2 of 2)
Sector
A21–A12
Sector/Sector Block Size