am49pdl127ah Meet Spansion Inc., am49pdl127ah Datasheet - Page 36

• Manufacturer Part Number: am49pdl127ah
• Description: Stacked Multi-chip Package Mcp Flash Memory And Psram, 128 Megabit 8m ? 16-bit Cmos 3.0 Volt-only, Simultaneous Operation Flash Memory And 16 Mbit 1m ? 16-bit Cmos Pseudo Static Ram
• Manufacturer: Meet Spansion Inc.

SECTOR PROTECTION
The Am29PDL127H/Am29PDL129H features several
levels of sector protection, which can disable both the
program and erase operations in certain sectors or
sector groups:
Persistent Sector Protection
A command sector protection method that replaces
the old 12 V controlled protection method.
Password Sector Protection
A highly sophisticated protection method that requires
a password before changes to certain sectors or sec-
tor groups are permitted.
WP# Hardware Protection
A write protect pin that can prevent program or erase
operations in sectors 0, 1, 268, and 269 in PDL 127 or
in SA1-133, SA1-134, SA2-0, SA2-1 in PDL 129. The
WP# Hardware Protection feature is always available,
regardless of which of the other two methods are cho-
sen.
Selecting a Sector Protection Mode
The device defaults to the Persistent Sector Protection
mode. However, to prevents a program or virus from
later setting the Password Mode Locking Bit, which
would cause an unexpected shift from the default Per-
sistent Sector Protection Mode into the Password Pro-
tection Mode, it is recommended that either of two
one-time programmable non-volatile bits that perma-
nently define which sector protection method be set
before the device is first programmed. The Persis-
tent Sector Protection Mode Locking Bit perma-
nently sets the device to the Persistent Sector
Protection mode. The Password Mode Locking Bit
permanently sets the device to the Password Sector
Protection mode. It is not possible to switch between
the two protection modes once a locking bit has been
set.
The device is shipped with all sectors unprotected.
AMD offers the option of programming and protecting
sectors at the factory prior to shipping the device
through AMD’s ExpressFlash™ Service. Contact an
AMD representative for details.
34
SA2-103 - SA2-106
SA2-107 - SA2-110
SA2-111 - SA2-114
SA2-99 - SA2-102
SA2-83 - SA2-86
SA2-87 - SA2-90
SA2-91 - SA2-94
SA2-95 - SA2-98
10011XXXXX
10100XXXXX
10101XXXXX
10110XXXXX
10111XXXXX
11000XXXXX
11001XXXXX
11010XXXXX
A D V A N C E
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
Am49PDL127AH/Am49PDL129AH
I N F O R M A T I O N
It is possible to determine whether a sector is pro-
tected or unprotected. See
quence
Persistent Sector Protection
The Persistent Sector Protection method replaces the
12 V controlled protection method in previous AMD
flash devices. This new method provides three differ-
ent sector protection states:
To achieve these states, three types of “bits” are used:
Persistent Protection Bit (PPB)
A single Persistent (non-volatile) Protection Bit is as-
signed to a maximum four sectors (see the sector ad-
dress tables for specific sector protection groupings).
All 4 Kword boot-block sectors have individual sector
Persistent Protection Bits (PPBs) for greater flexibility.
Each PPB is individually modifiable through the PPB
Write Command.
The device erases all PPBs in parallel. If any PPB re-
quires erasure, the device must be instructed to pre-
program all of the sector PPBs prior to PPB erasure.
Otherwise, a previously erased sector PPBs can po-
tentially be over-erased. The flash device does not
have a built-in means of preventing sector PPBs
over-erasure.
Persistent Protection Bit Lock (PPB Lock)
The Persistent Protection Bit Lock (PPB Lock) is a glo-
bal volatile bit. When set to “1”, the PPBs cannot be
changed. When cleared (“0”), the PPBs are change-
able. There is only one PPB Lock bit per device. The
PPB Lock is cleared after power-up or hardware reset.
There is no command sequence to unlock the PPB
Lock.
SA2-115 - SA2-118
SA2-119 - SA2-122
SA2-123 - SA2-126
SA2-127 - SA2-130
SA2-131 - SA2-134
Persistently Locked—The sector is protected and
cannot be changed.
Dynamically Locked—The sector is protected and
can be changed by a simple command.
Unlocked—The sector is unprotected and can be
changed by a simple command.
for details.
11011XXXXX
11100XXXXX
11101XXXXX
11110XXXXX
11111XXXXX
Autoselect Command Se-
December 18, 2003
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords
128 (4x32) Kwords