Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Function - Manual (Page 59)

Figure 3-10: Byte Order on the Avalon-ST Interface Lanes With Preamble Pass‑Through
Describes the byte order on the Avalon-ST interface when the preamble pass-through feature is turned
on.
Destination Address[40] is the broadcast/multicast bit (a type bit), and Destination Address[41] is a
locally administered address bit.
SFD Preamble Start
Destination Address
(DA)
Data (D) Source Address (SA)
Type/
Length
Octet 7 6 5 4 3 2 1 0 5 4 3 2 1 0 5 4 3 2 1 0 1 0 00 ... NN
Bit
[63:56] [55:48] [47:40] [39:32] [31:24] [23:16] [15:8] [7:0] [47:40] [39:32] [31:24] [23:16] [15:8] [7:0] [47:40] [39:32] [31:24] [23:16] [15:8] [7:0] [15:8] [7:0] MSB[7:0]
...
LSB[7:0]
3-14 Order of Transmission
UG-01172
2015.05.04
Altera Corporation Functional Description
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