S29PL-N_07 SPANSION [SPANSION], S29PL-N_07 Datasheet - Page 49

• Manufacturer Part Number: S29PL-N_07
• Description: 256/128/128 Mb (16/8/8 M x 16-Bit) CMOS, 3.0 Volt-only Simultaneous Read/Write, Page-Mode Flash Memory
• Manufacturer: SPANSION [SPANSION]

8.7
June 6, 2007 S29PL-N_00_A5
8.7.1
8.7.2
8.7.3
8.7.4
Hardware Data Protection Methods
WP# Method
Low V
Write Pulse Glitch Protection
Power-Up Write Inhibit
The device offers data protection at the sector level via hardware control:
There are additional methods by which intended or accidental erasure of any sectors can be prevented via
hardware means. The following subsections describes these methods:
The Write Protect feature provides a hardware method of protecting the four outermost sectors. This function
is provided by the WP#/ACC pin and overrides the previously discussed Sector Protection/Unprotection
method.
If the system asserts V
outermost boot sectors. The outermost boot sectors are the sectors containing both the lower and upper set
of sectors in a dual-boot-configured device.
If the system asserts V
be protected or unprotected. That is, sector protection or unprotection for these sectors depends on whether
they were last protected or unprotected.
Note that the WP#/ACC pin must not be left floating or unconnected as inconsistent behavior of the device
may result.
The WP#/ACC pin must be held stable during a command sequence execution
When V
power-up and power-down.
The command register and all internal program/erase circuits are disabled, and the device resets to reading
array data. Subsequent writes are ignored until V
proper signals to the control inputs to prevent unintentional writes when V
Noise pulses of less than 3 ns (typical) on OE#, CE# or WE# do not initiate a write cycle.
If WE# = CE# = RESET# = V
rising edge of WE#. The internal state machine is automatically reset to the read mode on powerup.
When WP#/ACC is at V
CC
CC
Write Inhibit
is less than V
D a t a
S h e e t
IH
IL
LKO
on the WP#/ACC pin, the device disables program and erase functions in the
on the WP#/ACC pin, the device reverts to whether the boot sectors were last set to
IL
, the four outermost sectors are locked (device specific).
, the device does not accept any write cycles. This protects data during V
IL
S29PL-N MirrorBit
and OE# = V
( P r e l i m i n a r y )
IH
during power up, the device does not accept commands on the
™
Flash Family
CC
is greater than V
LKO
. The system must provide the
CC
is greater than V
LKO
.
CC
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