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1DigitalIntegratedCircuits
ADesignPerspectiveTheWireJanM.RabaeyAnanthaChandrakasanBorivojeNikolic
2TheWireschematicsphysical
3InterconnectImpactonChip
4WireModelsAll-inclusivemodelCapacitance-only
5ImpactofInterconnectParasiticsInterconnectparasiticsreducereliabilityaffectperformanceandpowerconsumptionClassesofparasiticsCapacitiveResistiveInductive
6NatureofInterconnectGlobalInterconnectSLocal=STechnologySGlobal=SDieSource:Intel
7INTERCONNECTCapacitance
8CapacitanceofWireInterconnect
9Capacitance:TheParallelPlateModel
10Permittivity
11FringingCapacitance
12FringingversusParallelPlate
13InterwireCapacitance
14ImpactofInterwireCapacitance
15WiringCapacitances(0.25mmCMOS)
16INTERCONNECTResistance
17WireResistance
18InterconnectResistance
19DealingwithResistanceSelectiveTechnologyScalingUseBetterInterconnectMaterialsreduceaveragewire-lengthe.g.copper,silicidesMoreInterconnectLayersreduceaveragewire-length
20PolycideGateMOSFETn+n+SiO2PolySiliconSilicidepSilicides:WSi2,TiSi2,PtSi2andTaSiConductivity:8-10timesbetterthanPoly
21SheetResistance
22ModernInterconnect
23Example:Intel0.25micronProcess5metallayersTi/Al-Cu/Ti/TiNPolysilicondielectric
24INTERCONNECTInductance
25InterconnectModeling
26TheLumpedModel
27TheLumpedRC-Model
TheElmoreDelay
28TheEllmoreDelay
RCChain
29WireModelAssume:WiremodeledbyNequal-lengthsegmentsForlargevaluesofN:
30TheDistributedRC-lineThediffusionequation
31Step-responseofRCwireasafunctionoftimeandspace
32RC-Models
33DrivinganRC-line
34DesignRulesofThumbrcdelaysshouldonlybeconsideredwhentpRCtpgateofthedrivinggateLcrit?tpgate/0.38rcrcdelaysshouldonlybeconsideredwhentherise(fall)timeatthelineinputissmallerthanRC,therise(fall)timeofthelinetriseRCwhennotmet,thechangeinthesignalisslowerthanthepropagationdelayofthewire?MJIrwin,PSU,2023
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