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Application Notes
Switched Ethernet technology is key in automotive communication architectures and makes timing of automotive Ethernet networks critical. Automotive equipment manufacturers must often use specialized switches for automotive Ethernet networks.
Network timing verification and switch delay measurements can help ensure that the overall network latency is within design parameters. Oscilloscope protocol decode provides a nonintrusive way to measure the automotive Ethernet network switch delay, as well as overall network latency.
Automotive Ethernet systems rely on speed and timing. Knowing the latency of the overall network is critical. Original equipment manufacturers (OEMs) often set a maximum allowable delay, or latency, for a switch as part of the automotive Ethernet system requirement. For example, an OEM may require that a Tier 1 supplier use a switch with a delay of no more than 14 μs. If you work for that Tier 1 supplier, how do you measure the switch’s delay for the entire system? How do you determine the delay caused by the switch itself? This application note describes how to make these latency measurements.
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