Altera 10-Gbps Ethernet MAC MegaCore Function - Manual (Page 138)

Chapter 9: Interface Signals 9–19
February 2014 Altera Corporation 10-Gbps Ethernet MAC MegaCore Function User Guide
avalon_st_tx_pfc_gen_data[]
(1)
Input 4-16
The signal width is determined by the Number of PFC
priorities parameter, n = 2 x number priority queues
enabled.
■ Bit 0: Set this bit to 1 to trigger an XON request for
priority queue 0.
■ Bit 1: Set this bit to 1 to trigger an XOFF request for
priority queue 0.
■ Bit 2: Set this bit to 1 to trigger an XON request for
priority queue 1.
■ Bit 3: Set this bit to 1 to trigger an XOFF request for
priority queue 1.
■ Bit 4:Set this bit to 1 to trigger an XON request for
priority queue 2.
■ Bit 5: Set this bit to 1 to trigger an XOFF request for
priority queue 2.
■ Bit 6: Set this bit to 1 to trigger an XON request for
priority queue 3.
■ Bit 7: Set this bit to 1 to trigger an XOFF request for
priority queue 3.
■ Bit 8: Set this bit to 1 to trigger an XON request for
priority queue 4.
■ Bit 9: Set this bit to 1 to trigger an XOFF request for
priority queue 4.
■ Bit 10: Set this bit to 1 to trigger an XON request for
priority queue 5.
■ Bit 11: Set this bit to 1 to trigger an XOFF request for
priority queue 5.
■ Bit 12: Set this bit to 1 to trigger an XON request for
priority queue 6.
■ Bit 13: Set this bit to 1 to trigger an XOFF request for
priority queue 6.
■ Bit 14: Set this bit to 1 to trigger an XON request for
priority queue 7.
■ Bit 15: Set this bit to 1 to trigger an XOFF request for
priority queue 7.
If you simultaneously assert both bits corresponding to
priority queue n, neither the XOFF request nor the XON
request is generated.
avalon_st_tx_pause_length_data[] Input 16
This signal is present only in the MAX TX only variation.
Specifies the pause duration when a pause frame is
received on the TX path. The pause length is in unit of
pause quanta, where 1 pause length = 512 bits time.
avalon_st_tx_pause_length_valid Input 1
This signal is present only in the MAX TX only variation.
When asserted, this signal qualifies the data on the
avalon_st_tx_pause_length_data
bus.
Table 9–9. Avalon-ST Flow Control Signals (Part 2 of 3)
Signal Direction Width Description