s29jl032j Meet Spansion Inc., s29jl032j Datasheet - Page 24

• Manufacturer Part Number: s29jl032j
• Description: 32megabit 4m X 8-bit/2m X 16-bit Cmos 3.0volt-only, Simultaneous Read/write Flash Memory
• Manufacturer: Meet Spansion Inc.

8.11
8.12
24
Write Protect (WP#)
Temporary Sector Unprotect
The Write Protect function provides a hardware method of protecting certain boot sectors without using V
This function is one of two provided by the WP#/ACC pin.
If the system asserts V
outermost 8 Kbyte boot sectors independently of whether those sectors were protected or unprotected using
the method described in
8 Kbyte boot sectors are the two sectors containing the lowest addresses in a bottom-boot-configured device,
or the two sectors containing the highest addresses in a top-boot-configured device.
If the system asserts V
sectors were last set to be protected or unprotected. That is, sector protection or unprotection for these two
sectors depends on whether they were last protected or unprotected using the method described in
Sector Block Protection and Unprotection on page
Note that the WP#/ACC pin must not be left floating or unconnected; inconsistent behavior of the device may
result.
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
on page 22
This feature allows temporary unprotection of previously protected sectors to change data in-system. The
Temporary Sector Unprotect mode is activated by setting the RESET# pin to V
protected sectors can be programmed or erased by selecting the sector addresses. Once V
from the RESET# pin, all the previously protected sectors are protected again.
algorithm, and
V
Notes
1. All protected sectors unprotected (If WP#/ACC = V
2. All previously protected sectors are protected once again.
IL
WP# Input Voltage
, the two outermost boot sectors will remain protected during the Temporary sector Unprotect mode.
V
V
V
HH
IH
IL
and
Figure 17.12 on page 54
Table 8.7 on page
Disables programming and erasing in the two outermost boot sectors
Enables programming and erasing in the two outermost boot sectors, dependent on whether they were last
protected or unprotected
Enables accelerated programming (ACC).
IH
IL
D a t a
Sector/Sector Block Protection and Unprotection on page
on the WP#/ACC pin, the device disables program and erase functions in the two
on the WP#/ACC pin, the device reverts to whether the two outermost 8K Byte boot
Figure 8.1 Temporary Sector Unprotect Operation
S h e e t
23).
S29JL032J
Table 8.8 WP#/ACC Modes
shows the timing diagrams, for this feature. If the WP#/ACC pin is at
IL
, the outermost two boot sectors will remain protected).
Unprotect Completed
( A d v a n c e
Program Operations
Temporary Sector
Perform Erase or
RESET# = V
RESET# = V
22.
(Note 1)
(Note 2)
START
See Accelerated Program Operation on page 14.
Device Mode
ID
IH
I n f o r m a t i o n )
S29JL032J_00_01 January 27, 2010
ID
Figure 8.1
. During this mode, formerly
22. The two outermost
shows the
ID
is removed
Table 8.6
Sector/
ID
.