Xilinx 1000BASE-X - Manual (Page 140)

140 www.xilinx.com Ethernet 1000BASE-X PCS/PMA or SGMII v9.1
UG155 March 24, 2008
Chapter 9: Configuration and Status R
Register 5: SGMII Auto-Negotiation Link Partner Ability
The Auto-Negotiation Ability Base Register (Register 5) contains information related to the
status of the link between the PHY and its physical link partner across the Medium.
MDIO Register 5: SGMII Auto-Negotiation Link Partner Ability
Table 9-23: SGMII Auto-Negotiation Link Partner Ability Base (Register 5)
Bit(s) Name Description Attributes
Default
Value
5.15 PHY Link
Status This refers to the link status of the PHY with its
link partner across the Medium.
1 = Link Up
0 = Link Down
read only 1
5.14 Acknowle
dge Used by Auto-Negotiation function to indicate
reception of a link partner’s base or next page read only 0
5.13 Reserved Always returns ‘0,’ writes ignored returns 0 0
5.12 Duplex
Mode 1= Full Duplex
0 = Half Duplex
read only 0
5.11:10 Speed 11 = Reserved
10 = 1 Gbps
01 = 100 Mbps
00 = 10 Mbps
read only 00
5.9:1 Reserved Always return 0s returns 0s 000000000
5:0 Reserved Always returns ‘1’ returns 1 1
PHY LINK ST
A
TUS
A
CKNO
WLEDGE
RESER
VED
RESER
VED
15 14 13 12 11 0
Reg 5
DUPLEX MODE
9 1 10
SPEED RESER
VED