Altera 10-Gbps Ethernet MAC MegaCore Function - Manual (Page 124)

Chapter 9: Interface Signals 9–5
February 2014 Altera Corporation 10-Gbps Ethernet MAC MegaCore Function User Guide
Figure 9–4 shows the mapping of the client frame on the Avalon-ST transmit interface.
Figure 9–4. Mapping of Client Frame to Avalon-ST Transmit Interface
Notes to Figure 9–4 :
(1) <p> = payload size = 0–1500 bytes
(2) In the preamble passthrough mode, the client frame starts with an 8-byte client-defined preamble.
(3) n indicates the number of symbols that are empty during the cycles that mark the end of a frame.
avalon_st_tx_data[63:56]
avalon_st_tx_data[55:48]
avalon_st_tx_data[47:40]
avalon_st_tx_data[39:32]
avalon_st_tx_data[31:24]
avalon_st_tx_data[23:16]
avalon_st_tx_data[15:8]
avalon_st_tx_data[7:0]
tx_clk_clk
avalon_st_tx_valid
Client Frame(2)
Destination Addr[47:0] Source Addr[47:0] Type/
Length
[15:0]
Payload
[:0]
DA0 SA2
DA1 SA3
DA2 SA4
DA3 SA5
DA4 TL0
DA5 TL1
SA0 TL2
SA1 P0
P1
avalon_st_tx_ready
P2
P<p-1>
DA0 P0 DA1 DA2 DA3 DA4 DA5 SA0 SA1 SA2 SA3 SA4 SA5 TL0 TL1 P<p-1>
P3
P4
P5
P6
P7
P8
(1)
avalon_st_tx_startofpacket
avalon_st_tx_endofpacket
avalon_st_tx_empty [2:0] 0 n
avalon_st_tx_error
(3)