Altera 40-Gbps Ethernet MAC and PHY MegaCore Function - Manual (Page 56)

Figure 3-5: Traffic on the TX and RX Client Interface for 100GbE IP Core Using the Eight- to Five-Word
Adapters
Shows typical traffic for the TX and RX Avalon-ST interface of the 100GbE IP core. This example shows a
part of a ModelSim simulation of the parallel testbench provided with the IP core.
l8_tx_data[511:0]
l8_tx_startofpacket
l8_tx_endofpacket
l8_tx_empty[5:0]
l8_tx_ready
l8_tx_valid
l8_rx_data[511:0]
l8_rx_startofpacket
l8_rx_endofpacket
l8_rx_empty[5:0]
l8_rx_valid
l8_rx_error
.. . . . . . . . . 7CD901437CD901427C . . . . . . . . 3BCA01273BCA01263BCA01253 . . . . .
00 2F 00 29 00
64.. 64 . . A . . A . A . . A . . 6 . . 6 . . 6E . 6 . 07 . . FF . . FF . 07 . . FD4 . . 0707070707070
30 . 30 10 30 . 22 02 22 0D 2E 0E . 05 .
Related Information
• Testbenches with Adapters on page 2-15
Describes the 40GbE example in detail.
• Avalon Interface Specifications
For more information about the Avalon-ST interface.
40-100GbE IP Core TX Data Bus Without Adapters (Custom Streaming Interface)
When no adapters are used, the 40GbE custom interface bus width is 2 words (128 bits) and the 100GbE
custom interface bus width is 5 words (320 bits). In both cases the client interfaces operate at a frequency
above 315 MHz.
Figure 3-6: TX Client to MAC Interface Without Adapters
The custom streaming interface bus width varies with the IP core variation. In the figure, = 2 for the
40GbE IP core and = 5 for the 100GbE IP core.
TX Client
Logic
din[*64-1:0]
din_start[-1:0]
din_end_pos[*8-1:0]
din_ack
TX MAC
clk_txmac
UG-01088
2014.12.15
40-100GbE IP Core TX Data Bus Without Adapters (Custom Streaming Interface) 3-9
Functional Description Altera Corporation
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