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70V7319S200BFG Datasheet(PDF) 5 Page - Integrated Device Technology |
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70V7319S200BFG Datasheet(HTML) 5 Page - Integrated Device Technology |
5 / 22 page 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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