Cable breaks can occur while a system is running, and as such, it is imperative that the DP83822 is able to detect the break and indicate that the link has been lost in an accurate and timely manner. As a Profinet compliant device, the DP83822 is expected to indicate a dropped link as soon as it occurs. This applicaton note covers the cable break test scenarios the DP83822 were tested for and the register configuration required for Profinet qualification.
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It is imperative that information about status changes with the ethernet PHY be delivered to the MAC device in a timely and accurate manner. This becomes an important factor in systems designed for industrial applications that are time sensitive and require accuracy. For the purpose of this app note, the link drop status will be the focus. Regardless of cable length, the PHY must accurately and quickly indicate that a link has been dropped whenever there is a disturbance on the cable to prevent issues from propagating to the rest of the system.