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150 www.xilinx.com Ethernet 1000BASE-X PCS/PMA or SGMII v9.1
UG155 March 24, 2008
Chapter 9: Configuration and Status
R
Register 15: SGMII Extended Status
Both 1000BASE-X and SGMII Standards
Table 9-35 describes register 17, the vendor-specific Standard Selection Register. This
register is only present when the core is generated with the capability to dynamically
switch between 1000BASE-X and SGMII standards. See “Select Standard” in Chapter 3.
When this Register is configured to perform the 1000BASE-X standard, Registers 0 to 16
should be interpreted as per “1000BASE-X Standard Using the Optional Auto-
Negotiation,”
or “1000BASE-X Standard Without the Optional Auto-Negotiation.”
When this Register is configured to perform the SGMII standard, Registers 0 to 16 should
be interpreted as per “SGMII Standard Using the Optional Auto-Negotiation,”
or “SGMII
Standard without the Optional Auto-Negotiation.” This register may be written to at any
time. See Chapter 11, “Dynamic Switching of 1000BASE-X and SGMII Standards” for more
information.
MDIO Register 15: SGMII Extended Status
Table 9-34: SGMII Extended Status Register (Register 15)
Bit(s) Name Description Attributes Default Value
15.15 1000BASE-X
Full Duplex
Always returns a ‘1’ for this bit since
1000BASE-X Full Duplex is
supported
returns 1 1
15.14 1000BASE-X
Half Duplex
Always returns a ‘0’ for this bit since
1000BASE-X Half Duplex is not
supported
returns 0 0
15.13 1000BASE-T
Full Duplex
Always returns a ‘0’ for this bit since
1000BASE-T Full Duplex is not
supported
returns 0 0
15.12 1000BASE-T
Half Duplex
Always returns a ‘0’ for this bit since
1000BASE-T Half Duplex is not
supported
returns 0 0
15:11:0 Reserved Always return 0s returns 0s 000000000000
1000BASE-X FULL DUPLEX
1000BASE-X HALF DUPLEX
1000BASE-T FULL DUPLEX
15 14 13 12 11 0
Reg 15
RESERVED
1000BASE-T HALF DUPLEX