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參數(shù)資料
| 型號(hào)： | M29W008B |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 8 Mbit (1Mb x8, Boot Block) Low Voltage Single Supply Flash Memory(8 M位 (1Mb x8,導(dǎo)入塊)低壓?jiǎn)坞娫撮W速存儲(chǔ)器) |
| 中文描述： | 8兆（1兆× 8，引導(dǎo)塊）低電壓?jiǎn)坞娫纯扉W記憶體（8米位（1兆× 8，導(dǎo)入塊），低壓?jiǎn)坞娫撮W速存儲(chǔ)器） |
| 文件頁(yè)數(shù)： | 8/30頁(yè) |
| 文件大小： | 197K |
| 代理商： | M29W008B |
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DEVICEOPERATIONS
See Tables 4, 5 and 6.
Read.
Read operations are used to output the
contents of the Memory Array, the ElectronicSig-
nature,theStatusRegisteror the BlockProtection
Status.Both Chip Enable E and Output Enable G
must be low in order to read the output of the
memory.
Write.
Writeoperationsareusedto giveInstruction
Commands to the memoryor tolatch input datato
beprogrammed.Awrite operationisinitiatedwhen
Chip Enable E is Low and Write Enable W is Low
withOutput Enable G High.Addressesarelatched
onthefallingedge of WorEwhicheveroccurslast.
CommandsandInputDataarelatchedontherising
edge of W or E whicheveroccurs first.
OutputDisable.
The dataoutputsarehighimped-
ancewhen the Output EnableG is High with Write
EnableW High.
Standby.
The memory is in standby when Chip
EnableE is Highand theP/E.C.is idle.The power
consumption is reduced to the standby level and
the outputs are high impedance, independent of
the Output Enable G or WriteEnable W inputs.
Automatic Standby.
After 150ns of bus inactivity
andwhen CMOS levelsare drivingthe addresses,
the chip automatically enters a pseudo-standby
modewhereconsumptionis reducedto theCMOS
standbyvalue, while outputs still drive the bus.
Electronic Signature.
Two codes identifying the
manufacturer andthedevicecanbe read fromthe
memory. The manufacturer’s code for STMi-
croelectronicsis20h,thedevicecodeisD2hforthe
M29W008T (Top Boot) and DCh for the
M29W008B(BottomBoot).Thesecodesallowpro-
gramming equipment or applications to automat-
ically match their interfaceto thecharacteristicsof
the M29W008. The Electronic Signatureis output
by a Read operation when the voltage applied to
A9 is at V
ID
and address inputs A1 is Low. The
manufacturer code is output when the Address
inputA0 isLowandthedevicecode whenthisinput
is High. Other Address inputs are ignored. The
ElectronicSignaturecan alsoberead,withoutrais-
ingA9 to V
ID
, by giving the memorythe Instruction
AS.
Block Protection.
Each block can be separately
protected against Program or Erase on program-
ming equipment. Block protection provides addi-
tional data security, as it disables all program or
eraseoperations.Thismodeisactivatedwhenboth
A9 and G are raised to V
ID
and an address in the
block is applied on A13-A19. Block protection is
initiated on the edge of W fallingto V
IL
. Then after
a delayof 100
μ
s, the edge of W rising to V
IH
ends
theprotectionoperations.Blockprotectionverifyis
achievedby bringingG, E, A0and A6toV
IL
andA1
to V
IH
, whileWis atV
IH
andA9at V
ID
. Underthese
conditions,reading the data outputwill yield 01h if
the block defined by the inputs on A13-A19 is
protected.Any attemptto programor erasea pro-
tectedblockwill be ignoredby the device.
Block Temporary Unprotection.
Any previously
protectedblock can be temporarilyunprotectedin
ordertochangestoreddata.Thetemporaryunpro-
tection mode is activated by bringing RP to V
ID
.
During the temporary unprotection mode the pre-
viously protected blocks are unprotected. A block
can be selected and data can be modified by
executingtheEraseorPrograminstructionwiththe
RPsignalheld at V
ID
. When RP is returnedto V
IH
,
all the previously protected blocks are again pro-
tected.
Block Unprotection.
All protected blocks can be
unprotected on programming equipment to allow
updating of bit contents. All blocks must first be
protectedbefore theunprotectionoperation.Block
unprotectionis activatedwhen A9, G and E are at
V
ID
and A12, A15 at V
IH
. Unprotection is initiated
bytheedgeof WfallingtoV
IL
. Afteradelayof10ms,
the unprotection operation will end. Unprotection
verify is achieved by bringingG and E to V
IL
while
A0 is at V
IL
, A6 and A1 areat V
IH
and A9 remains
at V
ID
. Inthese conditions,readingthe output data
will yield 00h if the block defined by the inputs
A13-A19has been succesfully unprotected.Each
block must be separately verified by giving its ad-
dress in order to ensure that it has been unpro-
tected.
8/30
M29W008T, M29W008B
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