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      參數(shù)資料
      

      


      


      
型號(hào)：
S29GL064N90BAIV20

      

      
廠商：
Spansion Inc.

      

      
英文描述：
64 Megabit, 32 Megabit 3.0-Volt only Page Mode Flash Memory Featuring 110 nm MirrorBit Process Technology

      

      
中文描述：
64兆，32兆位3.0伏只頁(yè)面模式閃存具有110納米MirrorBit工藝技術(shù)

      

      
文件頁(yè)數(shù)：
34/79頁(yè)

      

      
文件大小：
2191K

      

      
代理商：
S29GL064N90BAIV20


      

      

      

	
      
    
    

    
      
	
      34
      S29GL-N MirrorBit
       Flash Family
      S29GL-N_01_09 November 16, 2007
      D a t a
      S h e e t
      8.14
      Password Sector Protection
      The Password Sector Protection method allows an even higher level of security than the Persistent Sector 
      Protection method. There are two main differences between the Persistent Sector Protection and the 
      Password Sector Protection methods:
       When the device is first powered on, or comes out of a reset cycle, the PPB Lock Bit is set to the locked 
      state, or the freeze state, rather than cleared to the unlocked state, or the unfreeze state.
       The only means to clear and unfreeze the PPB Lock Bit is by writing a unique 64-bit Password to the 
      device.
      The Password Sector Protection method is otherwise identical to the Persistent Sector Protection method.
      A 64-bit password is the only additional tool utilized in this method.
      The password is stored in a one-time programmable (OTP) region outside of the flash memory. Once the 
      Password Protection Mode Lock Bit is set, the password is permanently set with no means to read, program, 
      or erase it. The password is used to clear and unfreeze the PPB Lock Bit. The Password Unlock command 
      must be written to the flash, along with a password. The flash device internally compares the given password 
      with the pre-programmed password. If they match, the PPB Lock Bit is cleared to the 
      unfreezed state
      , and the 
      PPB bits can be altered. If they do not match, the flash device does nothing. There is a built-in 2 μs delay for 
      each 
      password check
       after the valid 64-bit password is entered for the PPB Lock Bit to be cleared to the 
      “unfreezed state”. This delay is intended to thwart any efforts to run a program that tries all possible 
      combinations in order to crack the password.
      8.15
      Password and Password Protection Mode Lock Bit 
      In order to select the Password Sector Protection method, the customer must first program the password. 
      The factory recommends that the password be somehow correlated to the unique Electronic Serial Number 
      (ESN) of the particular flash device. Each ESN is different for every flash device; therefore each password 
      should be different for every flash device. While programming in the password region, the customer may 
      perform Password Read operations. Once the desired password is programmed in, the customer must then 
      set the Password Protection Mode Lock Bit. This operation achieves two objectives:
      1. It permanently sets the device to operate using the Password Protection Mode. It is not possible to 
      reverse this function.
      2. It also disables all further commands to the password region. All program, and read operations are 
      ignored.
      Both of these objectives are important, and if not carefully considered, may lead to unrecoverable errors. The 
      user must be sure that the Password Sector Protection method is desired when programming the Password 
      Protection Mode Lock Bit. More importantly, the user must be sure that the password is correct when the 
      Password Protection Mode Lock Bit is programmed. Due to the fact that read operations are disabled, there is 
      no means to read what the password is afterwards. If the password is lost after programming the Password 
      Protection Mode Lock Bit, there is no way to clear and unfreeze the PPB Lock Bit. The Password Protection 
      Mode Lock Bit, once programmed, prevents reading the 64-bit password on the DQ bus and further password 
      programming. The Password Protection Mode Lock Bit is not erasable. Once Password Protection Mode 
      Lock Bit is programmed, the Persistent Protection Mode Lock Bit is disabled from programming, guaranteeing 
      that no changes to the protection scheme are allowed.
      8.16
      64-bit Password
      The 64-bit Password is located in its own memory space and is accessible through the use of the Password 
      Program and Password Read commands. The password function works in conjunction with the Password 
      Protection Mode Lock Bit, which when programmed, prevents the Password Read command from reading 
      the contents of the password on the pins of the device.
      
    
      
    
    
      


      


      

      相關(guān)PDF資料
      		

      PDF描述
      		

      
      

      
S29GL064N90BAIV22
64 Megabit, 32 Megabit 3.0-Volt only Page Mode Flash Memory Featuring 110 nm MirrorBit Process Technology

      

      
S29GL064N90BAIV60
64 Megabit, 32 Megabit 3.0-Volt only Page Mode Flash Memory Featuring 110 nm MirrorBit Process Technology

      

      
S29GL064N90BAIV62
64 Megabit, 32 Megabit 3.0-Volt only Page Mode Flash Memory Featuring 110 nm MirrorBit Process Technology

      

      
S29GL064N90BFI010
64 Megabit, 32 Megabit 3.0-Volt only Page Mode Flash Memory Featuring 110 nm MirrorBit Process Technology

      

      
S29GL064N90BFI012
64 Megabit, 32 Megabit 3.0-Volt only Page Mode Flash Memory Featuring 110 nm MirrorBit Process Technology

      

      

      

      


      


      

      相關(guān)代理商/技術(shù)參數(shù)
      		

      參數(shù)描述
      		

      
      

      
S29GL064N90BFI030
功能描述:閃存 64MB 2.7-3.6V 90ns Parallel NOR 閃存 RoHS:否 制造商:ON Semiconductor 數(shù)據(jù)總線寬度:1 bit 存儲(chǔ)類(lèi)型:Flash 存儲(chǔ)容量:2 MB 結(jié)構(gòu):256 K x 8 定時(shí)類(lèi)型: 接口類(lèi)型:SPI 訪問(wèn)時(shí)間: 電源電壓-最大:3.6 V 電源電壓-最小:2.3 V 最大工作電流:15 mA 工作溫度:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel

      

      
S29GL064N90BFI033
 制造商:Spansion 功能描述:FLASH PARALLEL 3V/3.3V 64MBIT 8MX8/4MX16 90NS 64BGA - Tape and Reel

      

      
S29GL064N90BFI040
功能描述:閃存 64Mb 3V 90ns Parallel NOR 閃存
 RoHS:否 制造商:ON Semiconductor 數(shù)據(jù)總線寬度:1 bit 存儲(chǔ)類(lèi)型:Flash 存儲(chǔ)容量:2 MB 結(jié)構(gòu):256 K x 8 定時(shí)類(lèi)型: 接口類(lèi)型:SPI 訪問(wèn)時(shí)間: 電源電壓-最大:3.6 V 電源電壓-最小:2.3 V 最大工作電流:15 mA 工作溫度:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體: 封裝:Reel

      

      
S29GL064N90BFI042
 制造商:Spansion 功能描述:

      

      
S29GL064N90DAI010
 制造商:Spansion 功能描述:64M  FLASH MEMORY - Trays

      

      
    
    
    
	
      	
    
    
     
     
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