Altera 10-Gbps Ethernet MAC MegaCore Function User Manual
Page 123
9–4
Chapter 9: Interface Signals
10-Gbps Ethernet MAC MegaCore Function User Guide
February 2014
Altera Corporation
Figure 9–2
shows the timing for the Avalon-ST transmit interface with a good frame.
When the client forwards an error frame to the Avalon-ST transmit interface, the client
asserts the avalon_st_tx_error signal to indicate errors in the current frame. The
avalon_st_tx_error
signal is aligned with the avalon_st_tx_endofpacket signal.
Figure 9–3
shows the timing for the Avalon-ST transmit interface with an error frame.
Figure 9–2. Avalon-ST Transmit Interface
Note to
Figure 9–2
:
(1) n indicates the number of symbols that are empty during the cycles that mark the end of a frame.
Figure 9–3. Avalon-ST Transmit Interface with Error
Note to
Figure 9–3
:
(1) n indicates the number of symbols that are empty during the cycles that mark the end of a frame.
tx_clk_clk
avalon_st_tx_startofpacket
avalon_st_tx_endofpacket
avalon_st_tx_valid
avalon_st_tx_ready
avalon_st_tx_data [63:0]
avalon_st_tx_empty [2:0]
avalon_st_tx_error
0
n (1)
tx_clk_clk
avalon_st_tx_startofpacket
avalon_st_tx_endofpacket
avalon_st_tx_valid
avalon_st_tx_ready
avalon_st_tx_data [63:0]
avalon_st_tx_empty [2:0]
avalon_st_tx_error
0
n (1)