Altera Low Latency Ethernet 10G MAC User Manual
Page 14
Parameter
Value
Description
Number of PFC queues
2—8
Specify the number of PFC queues. This
parameter is only enabled if you turn Enable
priority-based flow control (PFC).
Enable unidirectional feature
On, Off
Turn on this option to enable unidirectional
feature as specified in the IEEE802.3 specifica‐
tion (Clause 66). This feature is only supported
in 10Gbps speed mode.
This parameter is not available if you turn on
the Enable 10GBASE-R register mode
parameter.
Enable 10GBASE-R register
mode
On, Off
Turn on this option to enable 10GBASE-R
register mode on the transmit and receive
datapaths to further reduce the MAC and PHY
round-trip latency. In this mode, the MAC
datapaths must run at 322.265625 MHz. This
feature is only supported in 10Gbps speed
mode.
Enable supplementary
address
On, Off
Turn on this option to enable supplementary
addresses. You must also set the
EN_SUPP0
/
1
/
2
/
3
bits in the
rx_frame_control
register to 1.
Enable statistics collection
On, Off
Turn on this option to collect statistics on the
transmit and receive datapaths.
Statistics counters
Memory-based,
Register-based
Specify the implementation of the statistics
counters. When you turn on Statistics
collection, the default implementation of the
counters is Memory-based.
• Memory-based—selecting this option frees
up logic elements. The MAC IP core does
not clear memory-based counters after they
are read.
• Register-based—selecting this option frees
up the memory. The MAC IP core clears
register-based statistic counters after the
counters are read.
Enable time stamping
On, Off
Turn on this option to enable time stamping on
the transmit and receive datapaths.
This parameter is not available if you turn on
the Enable 10GBASE-R register mode
parameter.
Enable PTP one-step clock
support
On, Off
Turn on this option to enable 1-step time
stamping. This option is enabled only when
you turn on time stamping.
UG-01144
2014.12.15
Parameter Settings
2-5
Getting Started with LL Ethernet 10G MAC
Altera Corporation