Autoneg Complete - 3.1 English

UltraScale+ Devices Integrated 100G Ethernet Subsystem Product Guide (PG203)

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3.1 English

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.

Note:   The 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.