Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Function - Manual (Page 24)

Parameter Type Range Default
Setting
Parameter Description
Status clock
rate
Frequenc
y range
100–162
MHz
100
MHz
Sets the expected incoming
clk_status
frequency.
The input clock frequency must match the frequency
you specify for this parameter.
The IP core is configured with this information:
• To ensure the IP core measures the link fail inhibit
time accurately.Determines the value of the Link
Fail Inhibit timer (IEEE 802.3 clause 73.10.2)
correctly.
• If
clk_status
frequency is not 100 MHz, to
adjust the PHY clock monitors to report accurate
frequency information.
This parameter determines the PHY Management
clock (MGMT_CLK) frequency in MHz parameter
of the underlying 10GBASE-KR PHY IP core.
However, the default value of the Status clock rate
parameter is different.
Auto-Negotiation
Enable Auto-
Negotiation
Boolean • True
• False
True If this parameter is turned on, the IP core includes
logic to implement auto-negotiation as defined in
Clause 73 of IEEE Std 802.3ap–2007. If this parameter
is turned off, the IP core does not include auto-
negotiation logic and cannot perform auto-negotia‐
tion.
Currently the IP core can only negotiate to KR4
mode.
Link fail inhibit
time for 40Gb
Ethernet
Integer
(Unit:
ms)
500–510
ms
504 ms Specifies the time before link status is set to FAIL or
OK. A link fails if the time duration specified by this
parameter expires before link status is set to OK. For
more information, refer to Clause 73 Auto-Negotia‐
tion for Backplane Ethernet in IEEE Standard
802.3ap–2007.
The 40GBASE-KR4 IP core asserts the
rx_pcs_ready
signal to indicate link status is OK.
Auto-Negotia‐
tion Master
String • Lane 0
• Lane 1
• Lane 2
• Lane 3
Lane 0 Selects the master channel for auto-negotiation.
Pause ability–
C0
Boolean • True
• False
True If this parameter is turned on, the IP core indicates
on the Ethernet link that it supports symmetric
pauses as defined in Annex 28B of Section 2 of IEEE
Std 802.3–2008.
2-10 IP Core Parameters
UG-01172
2015.05.04
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