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    參數(shù)資料
    

    


    


    
型號(hào)：
S29PL-J70BAI011

    

    
廠(chǎng)商：
Spansion Inc.

    

    
元件分類(lèi)：
DRAM

    

    
英文描述：
CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
中文描述：
CMOS 3V電壓供電，同步讀/寫(xiě)Flash存儲(chǔ)器并有增強(qiáng)VersatileIO控制

    

    
文件頁(yè)數(shù)：
47/96頁(yè)

    

    
文件大?。?/td>
827K

    

    
代理商：
S29PL-J70BAI011


    

    

    

	
    
    
    

    
    
	
    September 22, 2006 S29PL-J_00_A9
    S29PL-J
    45
    D a t a
    S h e e t
    ( A d v a n c e
    I n f o r m a t i o n )
    12. Persistent Sector Protection
    The Persistent Sector Protection method replaces the 12 V controlled protection method in previous flash 
    devices. This new method provides three different 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
     Persistent Protection Bit Lock
     Persistent Sector Protection Mode Locking Bit
    12.1
    Persistent Protection Bit (PPB)
    A single Persistent (non-volatile) Protection Bit is assigned to a maximum four sectors (see the sector 
    address 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 requires erasure, the device must be instructed to 
    preprogram all of the sector PPBs prior to PPB erasure. Otherwise, a previously erased sector PPBs can 
    potentially be over-erased. The flash device does not have a built-in means of preventing sector PPBs over-
    erasure.
    12.2
    Persistent Protection Bit Lock (PPB Lock)
    The Persistent Protection Bit Lock (PPB Lock) is 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.
    12.3
    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 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 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 unprotected 
    conditions. This allows software to easily protect sectors against inadvertent changes yet does not prevent 
    the easy removal of protection 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 their 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 also 
    limited to 100 erase cycles. 
    The PPB Lock bit adds an additional level of protection. Once all PPBs are programmed to the desired 
    settings, the PPB Lock may be set to “1”. Setting the PPB Lock disables all program and erase commands to 
    the non-volatile PPBs. In effect, the PPB Lock Bit locks the PPBs into their current state. The only way to 
    clear the PPB Lock is to go through a power cycle. System boot code can determine if any changes to the 
    PPB are needed; for example, to allow new system code to be downloaded. If no changes are needed then 
    the boot code can set the PPB Lock to disable any further changes to the PPBs during system operation.
    
    
    
    
    
    


    


    

    相關(guān)PDF資料
    		

    PDF描述
    		

    
    

    
S29PL-J70BFI010
CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
S29PL-J70BFI011
CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
S29PL-J70BFI012
CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
S29PL-J70BFI013
CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
S29PL-J70BFI020
CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    

    

    


    


    

    相關(guān)代理商/技術(shù)參數(shù)
    		

    參數(shù)描述
    		

    
    

    
S29PL-J70BAI012
 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
S29PL-J70BAI013
 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
S29PL-J70BAI020
 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
S29PL-J70BAI021
 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
S29PL-J70BAI022
 制造商:SPANSION 制造商全稱(chēng):SPANSION 功能描述:CMOS 3.0 Volt-only, Simultaneous-Read/Write Flash Memory with Enhanced VersatileIO Control

    

    
    
    
    
	
    	
    
    
     
     
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