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參數(shù)資料
| 型號(hào)： | AM75PDL191CHHA |
| 廠商： | Spansion Inc. |
| 英文描述： | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| 中文描述： | 128兆位（8米× 16位），3.0伏的CMOS只，同步讀/寫(xiě)閃存 |
| 文件頁(yè)數(shù)： | 41/129頁(yè) |
| 文件大?。?/td> | 852K |
| 代理商： | AM75PDL191CHHA |
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January 14, 2004
Am75PDL191CHHa/Am75PDL193CHHa
39
A D V A N C E I N F O R M A T I O N
SECTOR PROTECTION
The Am50PDL191CH/Am50PDL193CH features sev-
eral 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.
It is possible to determine whether a sector is pro-
tected or unprotected. See
Autoselect Command Se-
quence
for details.
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:
■
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.
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.
Dynamic Protection Bit (DYB)
A volatile protection bit is assigned for each sector.
After power-up or hardware reset, the contents of all
DYBs is “0”. Each DYB is individually modifiable
through the DYB Write Command.
When the parts are first shipped, the PPBs are
cleared, the DYBs are cleared, and PPB Lock is de-
faulted to power up in the cleared state – meaning the
PPBs are changeable.
When the device is first powered on the DYBs power
up cleared (sectors not protected). The Protection
State for each sector is determined by the logical OR
of the PPB and the DYB related to that sector. For the
sectors that have the PPBs cleared, the DYBs control
whether or not the sector is protected or unprotected.
By issuing the DYB Write command sequences, the
DYBs will be set or cleared, thus placing each sector in
the protected or unprotected state. These are the
so-called
Dynamic Locked or Unlocked
states. They
are called dynamic states because it is very easy to
switch back and forth between the protected and un-
protected conditions. This allows software to easily
protect sectors against inadvertent changes yet does
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AM75PDL191CHHA70I | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| Am75PDL193CHHa | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| AM75PDL193CHHA70I | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| Am75PDL191CHH | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| AM75PDL191CHH_0402 | 128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AM75PDL191CHHA70I | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| AM75PDL193BHHA | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| AM75PDL193BHHA70I | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| AM75PDL193CHH | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
| AM75PDL193CHH70I | 制造商:SPANSION 制造商全稱:SPANSION 功能描述:128 Megabit (8 M x 16-Bit) CMOS 3.0 Volt-only, Simultaneous Read/Write Flash Memory |
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