SLAU723A October 2017 – October 2018 MSP432E401Y , MSP432E411Y
The software can use the VLAN insertion, replacement, or deletion feature to instruct the MAC to do the following for transmit frames:
The software can enable the VLAN insertion, replacement, or deletion feature for all transmitted frames or selective frames. To enable this function for all transmit frames, configure the VLT field in the EMACVLNINCREP register.
When VLAN replacement or deletion is enabled, the MAC checks the presence of the VLAN Type field (0x8100 or 0x88A8), after the Destination address (DA) and SA fields, in the transmit frame. The replace or delete operation does not occur if the VLAN Type field is not detected in the two bytes following the DA and SA fields. However, when VLAN insertion is enabled, the MAC does not check the presence of VLAN Type field in the transmit frame and just inserts the VLAN Type and VLAN Tag fields.