通过节能以太网 （EEE） 实现非对称数据速率.pdf

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1、Realizing Asymmetric Datarates via Energy Efficient Ethernet(EEE)Dr.Philip AxerAxonne Public1Agenda Introduction to EEE Timing and Latency Partitioning Configurations,Power&Robustness SummaryAxonne Public2Introduction to EEEAxonne Public3The need for AsymmetryEnterprise/Datacenter:Dynamic traffic pa

2、ttern.Exact use-case known by the users.Usually,service contracts that give guaranteeSymmetric data rates(except for last-mile)Automotive has obvious source/sink relationMajority of data is streaming data that is generated in the Zone and flows to central processingControl data flows in opposite dir

3、ection(actuation,sensor control,handshaking messages such as TCP/IP,)Axonne Public4Control(I2C)FusionRadarRadarRadarRadarDisplayVideo streamVideo streamRadar streamControl(I2C)ECUCameraVideo streamUser AUser BUser CUser DNetworkDatacenter applicationAutomotive applicationAsymmetric rates over symmet

4、ric EthernetTodays Ethernet(BASE-T1)is full-duplex and symmetric:same rate in both directionsExcept for 10BASE-T1SAll T1 speed grades=100M use active IDLE and exchange data when no Ethernet frames are being transmitted.Power consumption is data-independent and under-utilized links use powerEnergy Ef

5、ficient Ethernet (802.3-2022 Clause 78)addresses this issueEEE is specified for all 1000BASE-T1,2.5GBASE-T1,5GBASE-T1,10GBASE-T1 and 25GBASET1.Axonne Public5EEE Use-case:ImagerEthernet Imager with PoDL support(Example values)I2C Control 400 kHz60 fps4k RAW10PoDL to supply radar or camera nodesAssumi

6、ng I2C control activity linked to frame rate period of 17ms,downstream link is mostly idleAxonne Public6ECU12VPoDLETH-CSIPHYImagerCSII2CxMIINote:ETH-CSI is usually up-integratedDiagram not to scaleUpstreamDownstreamTrainingTrainingImager InitStreamingControl frameEEE-LPIHow dowsthis work in detail?E