Altera 10-Gbps Ethernet MAC MegaCore Function User 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