Altera Low Latency 40-Gbps Ethernet MAC and PHY MegaCore Manuel d'utilisateur Page 24

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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
Altera Corporation
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