When Auto-Negotiation is complete, the
stat_an_autoneg_complete output signal is asserted. In addition, the
ctl_an_fec_enable output signal is asserted if the Forward Error Correction hardware
is to be used; the ctl_tx_pause_en output signal is asserted if the transmitter
hardware is allowed to generate PAUSE control packets, the output signal
ctl_rx_pause_en is asserted if the receiver hardware is allowed to detect PAUSE
control packets, and the output link control of the selected link is set to its mission mode
value (bin) 11.
The results of the auto negotiation do not directly cause
the interface to change its behavior. External logic must determine how the ability
information is to be used. For example, the appropriate logic level can be applied to
ctl_tx_FEC_enable, ctl_tx_pause_enable, ctl_rx_FEC_enable, or
ctl_rx_pause_enable.
stat_an_autoneg_complete signal is not asserted until
rx_status is received from the PCS. That means that, where link training is included,
the stat_an_autoneg_complete output signal is not asserted until after link training
has completed.