SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The PHY automatically determines whether or not it needs to cross over between pairs so that an external crossover cable is not required. If the PHY communicates with a device that implements MDI/MDIX crossover, a random algorithm as described in IEEE 802.3 determines which device performs the crossover. Auto-MDIX is enabled by default at reset. If a different auto-MDIX configuration is required other than the reset initialization, the application can customize the configuration as described in Section 15.5.1.2. Neither Auto-Negotiation nor Auto-MDIX is required to be enabled in forcing crossover of the MDI pairs. Auto-MDIX can be used in the forced 100Base-TX mode. Because in modern networks all the nodes are 100Base-TX, having the Auto-MDIX working in the forced 100Base-TX mode resolves the link faster without the need for the long Auto-Negotiation period.