Visible to Intel only — GUID: vab1601393560531
Ixiasoft
Visible to Intel only — GUID: vab1601393560531
Ixiasoft
7.6. MAC Flow Control Interface
Signal Name |
Width | Description |
---|---|---|
i_tx_pause | 1 bit | When asserted, directs the IP core to send a PAUSE XOFF frame on the Ethernet link.
Note: For 10GE/25GE channels, you should hold the i_tx_pause signal more than 205 ns to get the request captured by the MAC.
|
i_tx_pfc[7:0] | 8 bits | When a bit is asserted, directs the IP core to send a PFC XOFF frame on the Ethernet link for the corresponding priority queue.
Note: For 10GE/25GE channels, you should hold the i_tx_pfc signal more than 205 ns to get the request captured by the MAC.
The rising edge triggers the request. You must maintain this signal at the value of 1 until you want the IP core to end the pause period. The IP core sends a PFC XOFF frame after it completes processing of the current in-flight TX packet, and periodically thereafter, until you deassert the i_tx_pfc bit. When you deassert the bit, the IP core sends a PFC XON frame on the Ethernet link for the corresponding priority queue. This signal is functional only if priority flow control is enabled. |
o_rx_pause | 1 bit | When asserted, indicates the IP core received a PAUSE XOFF frame on the Ethernet link. |
o_rx_pfc[7:0] | 8 bits | When a bit is asserted, indicates the IP core received a PFC XOFF frame on the Ethernet link for the corresponding priority queue. |