User guide
Word
Addr
Bit R/W Name Description
0x4
D4
5:0
RO or
RW
LD coefficient
update[5:0]
Reflects the contents of the first 16-bit word of the
training frame sent from the local device control channel.
Normally, the bits in this register are read-only; however,
when you override training by setting the Ovride Coef
enable control bit, these bits become writeable. The
following fields are defined:
• [5: 4]: Coefficient (+1) update
• 2'b11: Reserved
• 2'b01: Increment
• 2'b10: Decrement
• 2'b00: Hold
• [3:2]: Coefficient (0) update (same encoding as [5:4])
• [1:0]: Coefficient (-1) update (same encoding as [5:4])
For more information, refer to bit 10G BASE-KR LD
coefficient update register bits (1.154.5:0) in Clause
45.2.1.80.3 of IEEE 802.3ap-2007.
6
RO or
RW
LD Initialize
Coefficients
When set to 1, requests the link partner coefficients be set
to configure the TX equalizer to its INITIALIZE state.
When set to 0, continues normal operation. For more
information, refer to 10G BASE-KR LD coefficient
update register bits (1.154.12) in Clause 45.2.1.80.3 and
Clause 72.6.10.2.3.2 of IEEE 802.3ap-2007.
7 RO or
RW
LD Preset
Coefficients
When set to 1, requests the link partner coefficients be set
to a state where equalization is turned off. When set to 0
the link operates normally. For more information, refer
to bit 10GBASE-KR LD coefficient update register bit
(1.154.13) in Clause 45.2.1.80.3 and Clause 72.6.10.2.3.2
of IEEE 802.3ap-2007.
13:8 RO LD coefficient
status[5:0]
Status report register for the contents of the second, 16-
bit word of the training frame most recently sent from
the local device control channel. The following fields are
defined:
• [5:4]: Coefficient (post-tap)
• 2'b11: Maximum
• 2'b01: Minimum
• 2'b10: Updated
• 2'b00: Not updated
• [3:2]: Coefficient (0) (same encoding as [5:4])
• [1:0]: Coefficient (pre-tap) (same encoding as [5:4])
For more information, refer to bit 10GBASE-KR LD
status report register bit (1.155.5:0) in Clause 45.2.1.81 of
IEEE 802.3ap-2007.
2-196
Register Definitions
UG-01143
2015.05.11
Altera Corporation
Implementing Protocols in Arria 10 Transceivers
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