s71pl129ja0 Meet Spansion Inc., s71pl129ja0 Datasheet - Page 39

• Manufacturer Part Number: s71pl129ja0
• Description: Stacked Multi-chip Product Mcp Flash Memory And Psram 128 Megabit 8m X 16-bit Cmos 3.0 Volt-only Simultaneous Operation, Page Mode Flash Memory With 64/32/16 Megabit 4m/2m/1m X 16-bit Pseudo-static Ram
• Manufacturer: Meet Spansion Inc.

June 4, 2004 S29PL129J_MCP_00_A0
Temporary Sector Unprotect
Secured Silicon Sector Flash Memory Region
This feature allows temporary unprotection of previously protected sectors to
change data in-system. The Sector Unprotect mode is activated by setting the
RESET# pin to
grammed or erased by selecting the sector addresses. Once V
the RESET# pin, all the previously protected sect ors are protected again.
Figure 2
feature. While PPB lock is set, the device cannot enter the T emporary Sector Un-
protection Mode.
Not es:
1. All protected sectors are unprotected (If WP#/ACC = V
2. All previously protected sectors are protected once again
The Secured Silicon Sector feature provides a Flash memory region that enables
permanent part identification through an Electronic Serial Number (ESN) The
128-word Secured Silicon sector is divided into 64 factory-lockable words that
can be programmed and locked by the customer. The Secured Silicon sector is
located at addresses 000000h-00007Fh in both P ersistent Protection mode and
P assword Protection mode. Indicator bits DQ6 and DQ7 are used to indicate the
factory-locked and customer locked status of the part.
The system accesses the Secured Silicon Sector through a command sequence
(see
quence”
Sector command sequence, it may read the Secured Silicon Sector by using the
addresses normally occupied by the boot sectors. This mode of operation contin-
ues until the system issues the Exit Secured Silicon Sector command sequence,
or until power is removed from the device. On power-up, or following a hardware
reset, the device reverts to sending commands to the normal address space. Note
that the ACC function and unlock bypass modes are not available when the Se-
cured Silicon Sector is enabled.
two sectors remain protected).
“Enter Secured Silicon Sector/Exit Secured Silicon Sector Command Se-
shows the algorithm, and
on page 46). After the system has written the Enter Secured Silicon
A d v a n c e
Figure 2. Temporary Sector Unprotect Operation
V
ID
. During this mode, formerly protected sectors can be pro-
I n f o r m a t i o n
Unprotect Completed
Program Operations
T emporary Sector
S29PL129J for MCP
P erform Erase or
RESET# = V
RESET# = V
Figure 21
(Note 1)
(Note 2)
START
shows the timing diagrams, for this
ID
IH
IL
, upper two and lower
ID
is removed from
39