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LTR - Device ImplementationOS Bus DriverConfig Regs(Add support for LTR)• Hardware driven LTR– When device latencyrequirements change frequently– For devices like Network deviceswhich asynchronously receivedata from networkPHYDataLinkLayerTransactionLayer(Add supportfor LTR TLP)PCI Express* BlockLTR Value• Software guided LTR– When device latencyrequirements change infrequently– For slave devices which executework items scheduled by software– May define an MMIO register indevice, a write to which wouldtrigger an LTR messageApplicationSelect the mechanism appropriate for your device10