
Chapter 4: Backplane Ethernet 10GBASE-KR PHY IP Core 4–20
Register Interface and Register Descriptions
November 2012 Altera CorporationAltera Transceiver PHY IP Core
User Guide
Table 4–18 specifies the control and status registers that you can access over the
Avalon-MM PHY management interface. A single address space provides access to all
registers.
1 Unless otherwise indicated, the default value of all registers is 0.
1 Writing to reserved or undefined register addresses may have undefined side effects.
Table 4–18. 10GBASE-KR Register Definitions (Part 1 of 12)
Word
Address
Bit R/W Name Description
0xB0
0RW
Reset SEQ
When set to 1, resets the 10GBASE-KR sequencer.
Initiates PCS reconfiguration, Auto-Negotiation, or Link
Training. This bit must be used in conjunction with
SEQ
Force Mode[2:0]
. This reset self clears.
1RW
Disable AN Timer
Auto-Negotiation disable timer. If disabled (
Disable AN
Timer = 1)
, AN may get stuck and require software
support to remove the ABILITY_DETECT capability if the
link partner does not include this feature. In addition,
software may have to take the link out of loopback mode if
the link is stuck in the ACKNOWLEDGE_DETECT state. To
enable this timer set
Disable AN Timer = 0.
2RW
Disable LF Timer
When set to 1, disables the Link Fault timer. When set to 0,
the Link Fault timer is enabled.
6:4 RW
SEQ Force Mode[2:0]
Forces the sequencer to a specific protocol. Must write the
Reset SEQ
bit to 1 for the Force to take effect. The
following encodings are defined:
■ 3’b000: No force
■ 3’b001: GigE
■ 3’b010: Reserved
■ 3’b011: Reserved
■ 3’b100: 10GBASE-R
■ 3’b101: 10GBASE-KR
■ Others: Reserved
■
0xB1
0R
SEQ Link Ready
When asserted, the sequencer is indicating that the link is
ready.
1R
SEQ AN timeout
When asserted, the sequencer has had an
Auto-Negotiation timeout. This bit is latched and is reset
when the sequencer restarts Auto-Negotiation.
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