參數資料
型號： MX29GL320ETTI-70G
廠商： MACRONIX INTERNATIONAL CO LTD
元件分類： PROM
英文描述： 2M X 16 FLASH 3V PROM, 70 ns, PDSO48
封裝： 14 X 20 MM, ROHS COMPLIANT, MO-142, TSOP1-48
文件頁數： 26/73頁
文件大?。?/td> 2630K
代理商： MX29GL320ETTI-70G
32
P/N:PM1509
REV. 1.1, DEC. 03, 2010
MX29GL320E T/B
MX29GL320E H/L
4. Password Protection Method
ThesecuritylevelofPasswordProtectionMethodishigherthentheSolidprotectionmode.The64bitpassword
isrequestedbeforemodifySPBlockbitstatus.Whendeviceisunderpasswordprotectionmode,theSPBlock
bitisset“0”,afterapower-upcycleorResetCommand.
AcorrectpasswordisrequiredforpasswordUnlockcommand,tounlocktheSPBlockbit.Await2usisnecessary
to unlocked the device after valid password is given.After that, the SPB bits are allows to be changed.The
PasswordUnlockcommandareissuedslowerthen2μseverytime,.topreventhackerfromtryingallthe64-bit
passwordcombinations.
To place the device in password protection mode, a few more steps are required. First, prior to entering the
password protection mode, it is necessary to set a 64-bit password to verify it. Password verification is only
allowedduringthepasswordprogrammingoperation.Second,thepasswordprotectionmodeisthenactivated
byprogrammingthepasswordthePasswordProtectionModeLockBitto”0”.Thisoperationisnotreversible.
Oncethebitisprogrammed,itcannotbeerased,andthedeviceremainspermanentlyinpasswordprotection
mode, and the 64-bit password can neither be retrieved nor reprogrammed. Moreover, all commands to the
addresswherethepasswordisstoredaredisabled.
Thepasswordisall“1”swhenshippedfromthefactory,itisonlycapabletoprogramming"0"sunderpassword
programcommand.All64-bitpasswordcombinationsarevalidasapassword.Nospecialaddressisrequired
forprogrammingthepassword.Inordertopreventaccess,thePasswordModeLockingBitmustbesetafter
thePasswordisprogrammedandverified.OncethePasswordModeLockBitisset,preventsreading64-bits
passwordonthedatabusandanyfuturemodification.Thereisnomeanstoverifywhatthepasswordisafterit
isset.
Entrycommandsequencewillcausethereadandwriteoperationtobedisabledfornormalsectoruntilthismode
exits.Oncesectorunderprotectedstatus,devicewillignorestheprogram/erasecommand,enablestatuspolling
andreturnstoreadmodewithoutcontentschange.TheDPB,SPB,USPBandSPBlockbitstatusofeachsector
canbeverifiedbyissuestatusreadcommands.
3. Solid Protection Bit Lock Bit
The Solid Protection Bit Lock Bit (SPB) is assign to control all SPB status. It is a unique and volatile. When
SPB=0(set),allSPBsarelockedandcannotbechanged.WhenSPB=1(cleared),allSPBsareunlockand
allowstobechanged.
There is no software command sequence requested to unlocks this bit, unless the device is in the password
protectionmode.TocleartheSPBlockbit,justtakethedevicethroughahardwareresetorapower-upcycle.In
ordertopreventmoified,theSPBLockBitmustbeset(SPB=0)afterallSPBsaresettingthedesiredstatus.
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