
An_Expansion Register (Word Offset 0x06)
Table 6-18: An_Expansion Register Description
DescriptionR/WNameBit(s)
A value of 1 indicates that the link partner supports
auto-negotiation. The reset value is 0.
ROLINK_PARTNER_AUTO_
NEGOTIATION_ABLE
0
A value of 1 indicates that a new page is received
with new partner ability available in the register
partner_ability. The bit is set to 0 (reset value)
when the system management agent performs a
read access.
ROPAGE_RECEIVE1
Unused. Always set to 0.—NEXT_PAGE_ABLE2
——Reserved15:3
If_Mode Register (Word Offset 0x14)
Table 6-19: IF_Mode Register Description
DescriptionR/WNameBit(s)
Determines the PCS function operating mode. Setting
this bit to 1 enables SGMII mode. Setting this bit to 0
enables 1000BASE-X gigabit mode.
RWSGMII_ENA0
This bit applies only to SGMII mode. Setting this bit
to 1 causes the PCS function to be configured with the
link partner abilities advertised during auto-negotia-
tion. If this bit is set to 0, it is recommended for the
PCS function to be configured with the SGMII_SPEED
and SGMII_DUPLEX bits.
RWUSE_SGMII_AN1
SGMII speed. When the PCS function operates in
SGMII mode (SGMII_ENA = 1) and programed not to
be automatically configured (USE_SGMII_AN = 0), set
the speed as follows:
• 00: 10 Mbps
• 01: 100 Mbps
• 10: 1 Gigabit
• 11: Reserved
These bits are ignored when SGMII_ENA is 0 or USE_
SGMII_AN is 1. These bits are only valid if you only
enable the SGMII mode and not the auto-negotiation
mode.
RWSGMII_SPEED[1:0]3:2
Configuration Register Space
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UG-01008
An_Expansion Register (Word Offset 0x06)
6-26
2014.06.30
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