
4–28 Chapter 4: Backplane Ethernet 10GBASE-KR PHY IP Core
Register Interface and Register Descriptions
Altera Transceiver PHY IP Core November 2012 Altera Corporation
User Guide
0xD4
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 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 bit 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 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 1.155.5:0 in Clause
45.2.1.81 of IEEE 802.3ap-2007.
Table 4–18. 10GBASE-KR Register Definitions (Part 9 of 12)
Word
Address
Bit R/W Name Description
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