Altera 40-Gbps Ethernet MAC and PHY MegaCore Function Manuel d'utilisateur Page 81

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Conditions Triggering XOFF Frame Transmission
The TX MAC transmits XOFF frames when one of the following conditions occurs:
Client requests XOFF transmission—A client can explicitly request that XOFF frames be sent using the
pause control interface signals. When pause_insert_tx is asserted and pause_insert_time is not
zero, an XOFF frame is sent to the Ethernet network when the current frame transmission completes.
Host (software) requests XOFF transmission—Setting the pause control register triggers a request that
an XOFF frame be sent.
Both options are available in the 40-100GbE IP core with or without adapters.
Conditions Triggering XON Frame Transmission
The TX MAC transmits XON frames when one of the following conditions occurs:
Client requests XON transmission—A client can explicitly request that XON frames be sent using the
pause control interface signals. If pause_insert_tx is asserted and pause_insert_time is zero, an
XON frame is sent to the Ethernet network when the current frame transmission completes.
Host (software) requests XON transmission—Setting the pause control register triggers a request that
an XON frame be sent.
Both options are available in the 40-100GbE IP core with or without adapters.
3-34
Conditions Triggering XOFF Frame Transmission
UG-01088
2014.12.15
Altera Corporation
Functional Description
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