User guide
Word
Addr
Bit R/W Name Description
0x4
D4
23
RO or
RW
LP Preset
Coefficients
When set to 1, the local device TX coefficients are set to a
state where equalization is turned off. Preset coefficients
are used. When set to 0, the local device operates
normally. The function and values of the preset bit are
defined in 72.6.10.2.3.1. The function and values of the
initialize bit are defined in Clause 72.6.10.2.3.2. For more
information, refer to bit 10GBASE-KR LP coefficient
update register bits (1.152.13) in Clause 45.2.1.78.3 of
IEEE 802.3ap-2007.
29:24 RO LP coefficient
status[5:0]
Status report register reflecting the contents of the
second, 16-bit word of the training frame most recently
received from the control channel. The following fields
are defined:
• [5:4]: Coefficient (+1)
• 2'b11: Maximum
• 2'b01: Minimum
• 2'b10: Updated
• 2'b00: Not updated
• [3:2]: Coefficient (0) (same encoding as [5:4])
• n [1:0]: Coefficient (-1) (same encoding as [5:4])
For more information, refer to bit 10GBASE-KR LP
status report register bits (1.153.5:0) in Clause 45.2.1.79
of IEEE 802.3ap-2007.
30
RO LP Receiver ready When set to 1, the link partner receiver has determined
that training is complete and is prepared to receive data.
When set to 0, the link partner receiver is requesting that
training continue.
Values for the receiver ready bit are defined in Clause
72.6.10.2.4.4. For more information, refer to bit
10GBASE-KR LP status report register bits (1.153.15) in
Clause 45.2.1.79 of IEEE 802.3ap-2007.
0x4
D5
4:0 R LT V
OD
setting Stores the most recent V
OD
setting that LT specified. It
reflects Link Partner commands to fine-tune the V
OD
.
13:8 R LT Post-tap setting Stores the most recent post-tap setting that LT specified.
It reflects Link Partner commands to fine-tune the TX
pre-emphasis taps.
20:16 R LT Pre-tap setting Stores the most recent pre-tap setting that LT specified. It
reflects Link Partner commands to fine-tune the TX
pre-emphasis taps.
2-198
Register Definitions
UG-01143
2015.05.11
Altera Corporation
Implementing Protocols in Arria 10 Transceivers
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