Altera 10-Gbps Ethernet MAC MegaCore Function User 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
[<p-1>: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)