How can I select either transmitting a frame to GMII interface with error or discarding it by MAC function when ff_tx_err is asserted?

There is a documentation error in the TSE User Guide saying that the frame is either transmitted to the GMII interface with an error or discarded by the MAC function when ff_tx_err is asserted.

In fact, the TSE MAC has transmitted the frame to GMII interface when ff_tx_err signal is asserted. There is no frame discard option in this condition.