Altera 40-Gbps Ethernet MAC and PHY MegaCore Function - Manual (Page 73)

Figure 3-22: RX MAC to Client Interface with Adapters
The Avalon-ST interface bus width varies with the IP core variation. In the figure, = 4 for the 40GbE
IP core and = 8 for the 100GbE IP core. is log
2
(8*).
l_rx_data[*64-1:0]
l_rx_empty[-1:0]
l_rx_startofpacket
l_rx_endofpacket
l_rx_error
l_rx_valid
l_rx_fcs_valid
l_rx_fcs_error
RX
Client
RX
MAC
Table 3-5: Signals of the RX Client Interface with Adapters
In the table, = 4 for the 40GbE IP core and = 8 for the 100GbE IP core. is log
2
(8*).
Name Direction Description
l_rx_data[*64-1:0] Output RX data.
l_rx_empty[-1:0] Output Indicates the number of empty bytes on
l_rx_data
when
l_rx_endofpacket
is asserted, starting from the
least significant byte (LSB).
l_rx_startofpacket Output When asserted, indicates the start of a packet. The packet
starts on the MSB.
l_rx_endofpacket Output When asserted, indicates the end of packet.
l_rx_error Output When asserted indicates an error condition.
l_rx_valid Output When asserted, indicates that RX data is valid. Only valid
between the
l_rx_startofpacket
and
l_rx_
endofpacket
signals.
l_rx_fcs valid Output When asserted, indicates that FCS is valid.
l_rx_fcs_error Output When asserted, indicates an FCS error condition.
3-26 40-100GbE IP Core RX Data Bus with Adapters (Avalon-ST Interface)
UG-01088
2014.12.15
Altera Corporation Functional Description
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