參數(shù)資料
型號(hào)： RD28F3208C3T90
廠商： INTEL CORP
元件分類： 存儲(chǔ)器
英文描述： 3 VOLT INTEL Advanced+BootBlock FlashMemory(C3)Stacked-ChipScalPackageFamilye
中文描述： SPECIALTY MEMORY CIRCUIT, PBGA66
封裝： 8 X 10 MM, 1.20 MM HEIGHT, SCSP-66
文件頁數(shù)： 21/70頁
文件大小： 1223K
代理商： RD28F3208C3T90
3VoltIntel
Advanced+BootBlockFlashMemoryStacked-CSPFamily
Datasheet
21
3.8
128BitProtectionRegister
The3 VoltIntel
Advanced+Stacked-CSParchitectureincludesa128-bitprotectionregisterthan
canbeusedtoincreasethesecurityofasystemdesign.Forexample,thenumbercontainedinthe
protectionregistercanbeusedto“mate”theflashcomponentwithothersystemcomponentssuch
astheCPUorASIC,preventingdevicesubstitution.
3.8.1
ReadingtheProtectionRegister
Theprotectionregisterisreadintheconfigurationreadmode.Thedeviceisswitchedtothismode
bywritingtheReadConfigurationcommand(90h).Onceinthismode,readcyclesfromaddresses
showninAppendixEretrievethespecifiedinformation.Toreturntoreadarraymode,writethe
ReadArraycommand(FFh).
3.8.2
ProgrammingtheProtectionRegister(C0h)
Theprotectionregisterbitsareprogrammedusingthetwo-cycleProtectionProgramcommand.
The64-bitnumberisprogrammed16bitsatatimeforword-wideparts.FirstwritetheProtection
ProgramSetupcommand,C0h.Thenextwritetothedevicewilllatchinaddressanddataand
programthespecifiedlocation.TheallowableaddressesareshowninAppendixE.See
Figure20,
“ProtectionRegisterProgrammingFlowchart”onpage 51
.
Table8. BlockLockingStateTransitions
CurrentState
Erase/
Program
Allowed
NextStateafterCommandInput
WP#
DQ
1
DQ
0
Name
Lock
Unlock
Lock-Down
0
0
0
Unlocked
Yes
GoTo[001]
–
GoTo[011]
1
0
0
Unlocked
Yes
GoTo[101]
–
GoTo[111]
0
0
1
Locked
(Default)
No
–
GoTo[000]
GoTo[011]
1
0
1
Locked
No
–
GoTo[100]
GoTo[111]
0
1
1
Locked-Down
No
–
–
–
1
1
0
Lock-Down
Disabled
Yes
GoTo[111]
–
GoTo[111]
1
1
1
No
-
GoTo[110]
–
NOTES:
1. “–”indicatesnochangeinthecurrentstate.
2. Inthistable,thenotation[XYZ]denotesthelockingstateofablock,whereX = WP#,Y = DQ
,andZ = DQ
0
.Thecurrent
lockingstateofablockisdefinedbythestateofWP#andthetwobitsoftheblocklockstatus(DQ
0
,DQ
1
).DQ
0
indicatesifa
blockislocked(1)orunlocked(0).DQ
indicatesifablockhasbeenlocked-down(1)ornot(0).
3. Atpower-upordevicereset,allblocksdefaulttoLockedstate[001](ifWP# = 0).holdingWP# = 0istherecommended
default.
4. The“Erase/ProgramAllowed”columnshowswhethereraseandprogramoperationsareenabled(Yes)ordisabled(No)in
thatblock’scurrentlockingstate.
5. The“LockCommandInputResult[NextState]”columnshowstheresultofwritingthethreelockingcommands(Lock,Unlock,
Lock-Down)inthecurrentlockingstate.Forexample,“GoesTo[001]”wouldmeanthatwritingthecommandtoablockinthe
currentlockingstatewouldchangeitto[001].
6. The128bitsoftheprotectionregisteraredividedintotwo64-bitsegments.OneofthesegmentsisprogrammedattheIntel
factorywithaunique64bitnumber,whichisunchangeable.Theothersegmentisleftblankforcustomerdesignstoprogram
asdesired.Oncethecustomersegmentisprogrammed,itcanbelockedtopreventreprogramming.
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