Altera 40-Gbps Ethernet MAC and PHY MegaCore Function - Manual (Page 185)

Word
Addr
Bit R/W Name Description
19:10 RW
ber_time_k_frames
Specifies the number of thousands of training frames to
examine for bit errors on the link for each step of the
equalization settings. Set ber_time_m_frames = 0 for time/
bits to match the following values:
• A value of 3 is about 10
7 bits = about 1.3 ms
• A value of 25 is about 10 8 bits = about 11ms
• A value of 250 is about 10 9 bits = about 11 0ms
The default value for simulation is 0. The default value for
hardware is 0x15.
29:20 RW
ber_time_m_frames
Specifies the number of millions of training frames to
examine for bit errors on the link for each step of the
equalization settings. Set ber_time_k_frames = 4'd1000 =
0x3E8 for time/bits to match the following values:
• A value of 3 is about 10
10 bits = about 1.3 seconds
• A value of 25 is about 10 11 bits = about 11 seconds
• A value of 250 is about 10 12 bits = about 110 seconds
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 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 10G
BASE-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.
C-12 10GBASE-KR PHY Register Definitions
UG-01088
2014.12.15
Altera Corporation 10GBASE-KR Registers
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