4.15 Cable Fault Diagnostics
The LAN8670/1/2 contains hardware support for cable fault diagnostics, which can be used to support, for example, OPEN Alliance harness defect detection requirements for automotive Ethernet PHYs. Using these features, it is possible for a station host controller to determine various cable failures in a multidrop network. These failures include
- Both conductors open
- Both conductors shorted together
- Both conductors shorted to power or ground
Additional information, including the software algorithm recommended for the host
controller, is available under NDA. When using the software algorithm to aid in the
harness defect detection, the following failures may additionally be possible to detect
under the correct circumstances:
- One conductors shorted to ground or a supply voltage
- One conductor open
- Incorrect wire termination