Altera 40-Gbps Ethernet MAC and PHY MegaCore Function - Manual (Page 90)

Control Data Description
1 fd End of Frame (fd = frame done).
1 fe XL/CGMII Error. Typically a bit error which switched a 66-bit block
between data and control, or corrupt control information (fe = frame
error).
MAC to PHY Connection Interface
Table 3-11: MAC to PHY and PHY to MAC TX and RX Signals
The MAC–PHY connection interface is exposed in the 40-100GbE MAC-only and PHY-only IP core variations.
In addition, the
tx_lanes_stable
output signal from the PHY component is available to provide status informa‐
tion to user logic in PHY-only IP core variations and in MAC and PHY IP core variations.
In the table, = 2 for the 40GbE IP core and = 5 for the 100GbE IP core.
Signal Name Direction Description
TX Connections (Data from MAC to PHY)
tx_mii_d[*64-
1:0] Output
from MAC
and input to
PHY
Media independent interface (MII) data TX connection, starting
with the least significant bit (LSB).
tx_mii_c[*8-1:0] MII control TX connection.
tx_mii_valid Asserted upon valid TX to MII connection.
tx_mii_ready
Output
from PHY
and input to
MAC
Asserted when TX data bus is ready for MII connection.
tx_lanes_stable Asserted when TX lanes are stable and deskewed. This signal is
available as an output status signal in MAC and PHY IP core
variations as well as in PHY-only variations.
RX Connections (Data from PHY to MAC)
rx_mii_d[*64-
1:0] Output
from PHY
and input to
MAC
MII data RX connection, starting with the LSB and least signifi‐
cant word, outputting a 5-word data stream.
rx_mii_c[*8-1:0] MII control RX connection.
rx_mii_valid Asserted when RX blocks are valid.
Lane to Lane Deskew Interface
The lane to lane deskew signal is included in the 40-100GbE IP core with and without adapters. When
both MAC and PHY options are selected, the lane to lane deskew input signal acts as an internal signal.
The lane to lane deskew output signal from the PHY component is available to provide status information
to user logic in both PHY-only and MAC and PHY IP core variations.
UG-01088
2014.12.15
MAC to PHY Connection Interface 3-43
Functional Description Altera Corporation
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