參數(shù)資料
型號(hào)： S29CD016G0JFFM012
廠商： Spansion Inc.
英文描述： 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
中文描述： 32兆位（1米× 32位），16兆位（512k × 32的位），2.5伏，只有突發(fā)模式，雙啟動(dòng)，同步讀/寫閃存與VersatileI內(nèi)存/輸出
文件頁數(shù)： 36/87頁
文件大?。?/td> 792K
代理商： S29CD016G0JFFM012
34
S29CD-G Flash Family
S29CD-G_00_B0 November 14, 2005
P r e l i m i n a r y
the default mode alone.
This is so that it is not possible for a system program or virus to later
set the Password Mode Locking Bit, which would cause an unexpected shift from the default Per-
sistent Sector Protection Mode into the Password Protection Mode.
The WP# Hardware Protection feature is always available, independent of the software managed
protection method chosen.
Persistent Sector Protection
The Persistent Sector Protection method replaces the old 12 V controlled protection method while
at the same time enhancing flexibility by providing three different sector protection states:
In order to achieve these states, three types of
bits
are going to be used:
Persistently Locked
—A 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
Persistent Protection Bit ( PPB)
A single Persistent (non-volatile) Protection Bit is assigned to a maximum of four sectors (see the
sector address tables for specific sector protection groupings). All 8 Kbyte boot-block sectors have
individual sector Persistent Protection Bits (PPBs) for greater flexibility. Each PPB is individually
modifiable through the
PPB W rite Command
.
Note:
If a PPB requires erasure, all of the sector PPBs must first be preprogrammed prior to PPB eras-
ing. All PPBs erase in parallel, unlike programming where individual PPBs are programmable. It is the
responsibility of the user to perform the preprogramming operation. Otherwise, an already erased sec-
tor PPBs has the potential of being over-erased. There is no hardware mechanism to prevent sector
PPBs over-erasure.
Persistent Protection Bit Lock ( PPB Lock)
A global volatile bit. When set to
1
, the PPBs cannot be changed. When cleared (
0
), the PPBs are
changeable. 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 ( DY B)
A volatile protection bit is assigned for each sector. After power-up or hardware reset, the con-
tents 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
defaulted 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 Pro-
tection 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 is 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 unprotected conditions. This allows software to
easily protect sectors against inadvertent changes yet does not prevent the easy removal of pro-
tection when changes are needed. The DYBs maybe set or cleared as often as needed.
The PPBs allow for a more static, and difficult to change, level of protection. The PPBs retain state
across power cycles because they are Non-Volatile. Individual PPBs are set with a command but
must all be cleared as a group through a complex sequence of program and erasing commands.
The PPBs are limited to 100 erase cycles.
The PPB Lock bit adds an additional level of protection. Once all PPBs are programmed to the de-
sired settings, the PPB Lock may be set to
1
. Setting the PPB Lock disables all program and erase
相關(guān)PDF資料
PDF描述
S29CD016G0JFFM100 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFFM102 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFFM110 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFFM112 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFFM200 32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
S29CD016G0JFFM100 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFFM102 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFFM110 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFFM112 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
S29CD016G0JFFM200 制造商:SPANSION 制造商全稱:SPANSION 功能描述:32 Megabit (1M x 32-Bit), 16 Megabit (512K x 32-Bit) 2.5 Volt-only Burst Mode, Dual Boot, Simultaneous Read/ Write Flash Memory with VersatileI/O
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