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70V7319S200BFG Datasheet(PDF) 5 Page - Integrated Device Technology

Part # 70V7319S200BFG
Description  HIGH-SPEED 3.3V 256K x 18 SYNCHRONOUS BANK-SWITCHABLE DUAL-PORT STATIC RAM
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Manufacturer  IDT [Integrated Device Technology]
Direct Link  http://www.idt.com
Logo IDT - Integrated Device Technology

70V7319S200BFG Datasheet(HTML) 5 Page - Integrated Device Technology

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6.42
IDT70V7319S
High-Speed 256K x 18 Synchronous Bank-Switchable Dual-Port Static RAM
Industrial and Commercial Temperature Ranges
5
NOTES:
1. "H" = VIH,"L" = VIL,"X" = Don't Care.
2. ADS,CNTEN,REPEATaresetasappropriateforaddressaccess.RefertoTruthTableIIfordetails.
3. OEisanasynchronousinputsignal.
4. Itispossibletoreadorwriteanycombinationofbytesduringagivenaccess.Afewrepresentativesampleshavebeenillustratedhere.
Truth Table I—Read/Write and Enable Control(1,2,3,4)
OE3
CLK
CE0
CE1
UB
LB
R/W
Upper Byte
I/O9-17
Lower Byte
I/O0-8
MODE
X
H
XXXX
High-Z
High-Z
Deselected–Power Down
X
X
L
X
X
X
High-Z
High-Z
Deselected–Power Down
X
L
H
H
H
X
High-Z
High-Z
All Bytes Deselected
X
LH
H
L
L
High-Z
DIN
Write to Lower Byte Only
X
LH
LH
L
DIN
High-Z
Write to Upper Byte Only
X
LH
L
L
L
DIN
DIN
Write to both Bytes
L
LH
H
L
H
High-Z
DOUT
Read Lower Byte Only
L
LH
LH
H
DOUT
High-Z
Read UpperByte Only
L
LH
L
L
H
DOUT
DOUT
Read both Bytes
H
XXXXXX
High-Z
High-Z
Outputs Disabled
5629 tbl 02
Truth Table II—Address and Address Counter Control(1,2,7)
NOTES:
1. "H" = VIH,"L" = VIL,"X" = Don't Care.
2. ReadandwriteoperationsarecontrolledbytheappropriatesettingofR/W,CE0,CE1,UB/LBandOE.
3. Outputsconfiguredinflow-throughoutputmode:ifoutputsareinpipelinedmodethedataoutwillbedelayedbyonecycle.
4. ADSandREPEATareindependentofallothermemorycontrolsignalsincludingCE0,CE1andUB/LB
5. TheaddresscounteradvancesifCNTEN=VILontherisingedgeofCLK,regardlessofallothermemorycontrolsignalsincludingCE0,CE1,UB/LB.
6. WhenREPEATisasserted,thecounterwillresettothelastvalidaddressloadedviaADS.Thisvalueisnotsetatpower-up:aknownlocationshouldbeloadedviaADSduringinitialization
ifdesired.AnysubsequentADSaccessduringoperationswillupdatetheREPEATaddresslocation.
7. Thecounterincludesbankaddressandinternaladdress.Thecounterwilladvanceacrossbankboundaries.Forexample,ifthecounterisinBank0,ataddressFFFh,andisadvancedone
location,itwillmovetoaddress0hinBank1.Bythesametoken,thecounteratFFFhinBank63willadvanceto0hinBank0.RefertoTimingWaveformofCounterRepeat,page17.Care
shouldbetakenduringoperationtoavoidhavingbothcounterspointtothesamebank(i.e.,ensureBA0L-BA5L
≠BA0R-BA5R),asthisconditionwillinvalidatetheaccessforbothports.
Pleaserefertothefunctionaldescriptiononpage18fordetails.
Address
Previous
Address
Addr
Used
CLK
ADS
CNTEN
REPEAT(6)
I/O(3)
MODE
An
X
An
L(4)
XH
DI/O (n)
External Address Used
XAn
An + 1
H
L(5)
HDI/O(n+1)
Counter Enabled—Internal Address generation
X
An + 1
An + 1
HH
H
DI/O(n+1)
External Address Blocked—Counter disabled (An + 1 reused)
XX
An
XX
L(4)
DI/O(0)
Counter Set to last valid ADS load
5629 tbl 03


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