Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Bedienungsanleitung PDF herunterladen (Seite 78)

If you turn on bit [1] of the LINK_FAULT_CONFIG register, the IP core conforms to Clause 66 of the IEEE

802.3-2012 Ethernet Standard and transmits the fault sequence ordered sets in the interpacket gaps

according to the clause requirements.

The RS RX logic sets remote_fault_status or local_fault_status to 1 when the RS RX block receives

remote fault or local fault sequence ordered sets. When valid data is received in more than 127 columns,

the RS RX logic resets the relevant fault status (remote_fault_status or local_fault_status) to 0.

If you turn off Enable link fault generation, the remote_fault_status and local_fault_status

signals are still available, but they always have the value of 0.

The IEEE standard specifies RS monitoring of RXC<7:0> and RXD<63:0> for Sequence ordered_sets.

For more information, refer to Figure 81–9—Link Fault Signaling state diagram and Table 81-5—Sequence

ordered_sets in the IEEE 802.3ba 2010 100G Ethernet Standard . The variable link_fault is set to

indicate the value of an RX Sequence ordered_set when four fault_sequences containing the same

fault value are received with fault sequences separated by less than 128 columns and with no intervening

fault_sequences of different fault values. The variable link_fault is set to OK following any interval of

128 columns not containing a remote fault or local fault Sequence ordered_set.

Table 3-8: Signals of the Link Fault Signaling Interface

These signals are available only if you turn on Enable link fault generation in the LL 40-100GbE parameter editor

or you upgrade your IP core from an earlier release in which the signals are available in any case.

Signal Name Direction Description

remote_fault_status Output Asserted when remote fault is detected in RX MAC.

If you turned off Enable link fault generation in your IP core

variation in an earlier release, and then upgraded to the current

release, this signal is present but is tied low (always has the value

of 0).

This signal is clocked by clk_status.

local_fault_status Output Asserted when local fault is detected in RX MAC.

If you turned off Enable link fault generation in your IP core

variation in an earlier release, and then upgraded to the current

release, this signal is present but is tied low (always has the value

of 0).

This signal is clocked by clk_status.

unidirectional_en Output The IP core asserts this signal if it includes Clause 66 support for

remote link fault reporting on the Ethernet link. Connects to the

Unidir Enable field in bit [1] of the LINK_FAULT_CONFIG register

at offset 0x405.

This signal is clocked by clk_txmac.

If you turn off Enable link fault generation this signal is not

available.

UG-01172

2015.05.04

Link Fault Signaling Interface

3-33

Functional Description

Altera Corporation

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