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S29GL128N11TAIV10 参数 Datasheet PDF下载

S29GL128N11TAIV10图片预览
型号: S29GL128N11TAIV10
PDF下载: 下载PDF文件 查看货源
内容描述: 3.0伏只页面模式闪存具有110纳米MirrorBit⑩工艺技术 [3.0 Volt-only Page Mode Flash Memory featuring 110 nm MirrorBit⑩ Process Technology]
分类和应用: 闪存
文件页数/大小: 100 页 / 2678 K
品牌: SPANSION [ SPANSION ]
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D a t a S h e e t  
Once the Password is written and verified, the Password Protection Mode Lock Bit in the Lock  
Register must be programmed in order to prevent verification. The Password Program com-  
mand is only capable of programming 0s. Programming a 1 after a cell is programmed as a  
0 results in a time-out by the Embedded Program AlgorithmTM with the cell remaining as a 0.  
The password is all F’s when shipped from the factory. All 64-bit password combinations are  
valid as a password.  
The Password Read command is used to verify the Password. The Password is verifiable only  
when the Password Protection Mode Lock Bit in the Lock Register is not programmed. If the  
Password Protection Mode Lock Bit in the Lock Register is programmed and the user attempts  
to read the Password, the device always drives all F’s onto the DQ databus.  
The lower two address bits (A1–A0) for word mode and (A1–A-1) for by byte mode are valid  
during the Password Read, Password Program, and Password Unlock commands. Writing a  
1 to any other address bits (AMAX-A2) aborts the Password Read and Password Pro-  
gram commands.  
The Password Unlock command is used to clear the PPB Lock Bit to the unfreeze state so that  
the PPB bits can be modified. The exact password must be entered in order for the unlocking  
function to occur. This 64-bit Password Unlock command sequence takes at least 2 µs to pro-  
cess each time to prevent a hacker from running through the all 64-bit combinations in an  
attempt to correctly match the password. If another password unlock is issued before the  
64-bit password check execution window is completed, the command is ignored. If the wrong  
address or data is given during password unlock command cycle, the device may enter the  
write-to-buffer abort state. In order to exit the write-to-abort state, the  
write-to-buffer-abort-reset command must be given. Otherwise the device hangs.  
The Password Unlock function is accomplished by writing Password Unlock command and data  
to the device to perform the clearing of the PPB Lock Bit to the unfreeze state. The password  
is 64 bits long. A1 and A0 are used for matching in word mode and A1, A0, A-1 in byte mode.  
Writing the Password Unlock command does not need to be address order specific. An exam-  
ple sequence is starting with the lower address A1-A0=00, followed by A1-A0=01, A1-A0=10,  
and A1-A0=11 if the device is configured to operate in word mode.  
Approximately 2 µs is required for unlocking the device after the valid 64-bit password is  
given to the device. It is the responsibility of the microprocessor to keep track of the entering  
the portions of the 64-bit password with the Password Unlock command, the order, and when  
to read the PPB Lock bit to confirm successful password unlock. In order to re-lock the device  
into the Password Protection Mode, the PPB Lock Bit Set command can be re-issued.  
Note: The Password Protection Command Set Exit command must be issued after the exe-  
cution of the commands listed previously to reset the device to read mode. Otherwise the  
device hangs.  
Note: Issuing the Password Protection Command Set Exit command re-enables reads and  
writes for the main memory.  
Non-Volatile Sector Protection Command Set Definitions  
The Non-Volatile Sector Protection Command Set permits the user to program the Persistent  
Protection Bits (PPB bits), erase all of the Persistent Protection Bits (PPB bits), and read the  
logic state of the Persistent Protection Bits (PPB bits).  
The Non-Volatile Sector Protection Command Set Entry command sequence must be is-  
sued prior to any of the commands listed following to enable proper command execution.  
Note that issuing the Non-Volatile Sector Protection Command Set Entry command dis-  
ables reads and writes for the main memory.  
„ PPB Program Command  
60  
S29GL-N MirrorBit™ Flash Family  
S29GL-N_00_B3 October 13, 2006