Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Function - Manual (Page 79)

Signal Name Direction Description
link_fault_gen_en
Output The IP core asserts this signal if the PCS is enabled to generate a
remote fault sequence on the Ethernet link when appropriate.
Connects to the
Link Fault Reporting Enable
field in bit [0] of
the
LINK_FAULT_CONFIG
register at offset 0x405.
This signal is clocked by
clk_status
.
If you turn off Enable link fault generation this signal is not
available.
Related Information
• Link Fault Signaling Registers on page 3-70
Information about the
Link Fault Reporting Enable
register and the
Unidir Enable
register.
• IEEE website
The IEEE 802.3ba –2010 100G Ethernet Standard and the IEEE 802.3 –2012 Ethernet Standard are
available on the IEEE website.
Statistics Counters Interface
The statistics counters modules are synthesis options that you select in the Low Latency 40-100GbE
parameter editor. However, the statistics status bit output vectors are provided whether you select the
statistics counters module option or not.
The increment vectors are brought to the top level as output ports.The increment vectors also function
internally as input ports to the control and status registers (CSR).
Table 3-9: Statistics Counters Increment Vectors
The TX statistics counter increment vectors are clocked by the
clk_txmac
clock, and the RX statistics counter
increment vectors are clocked by the
clk_rxmac
clock.
Name Signal
Direction
Description
TX Statistics Counter Increment Vectors
tx_inc_64 Output Asserted for one cycle when a 64-byte TX frame is transmitted.
tx_inc_127 Output Asserted for one cycle when a 65–127 byte TX frame is transmitted.
tx_inc_255 Output Asserted for one cycle when a 128–255 byte TX frame is transmitted.
tx_inc_511 Output Asserted for one cycle when a 256–511 byte TX frame is transmitted.
tx_inc_1023 Output Asserted for one cycle when a 512–1023 byte TX frame is transmitted.
tx_inc_1518 Output Asserted for one cycle when a 1024–1518 byte TX frame is transmitted.
3-34 Statistics Counters Interface
UG-01172
2015.05.04
Altera Corporation Functional Description
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