120 www.xilinx.com Ethernet 1000BASE-X PCS/PMA or SGMII v9.1
UG155 March 24, 2008
Chapter 9: Configuration and Status
R
Register 0: Control Register
2,3 PHY Identifier
4 Auto-Negotiation Advertisement Register
5 Auto-Negotiation Link Partner Ability Base Register
6 Auto-Negotiation Expansion Register
7 Auto-Negotiation Next Page Transmit Register
8 Auto-Negotiation Next Page Receive Register
15 Extended Status Register
16 Vendor Specific: Auto-Negotiation Interrupt Control
Table 9-2: MDIO Registers for 1000BASE-X with Auto-Negotiation (Continued)
Register Address Register Name
MDIO Register 0: Control Register
Table 9-3: Control Register (Register 0)
Bit(s) Name Description Attributes
Default
Value
0.15 Reset 1 = Core Reset
0 = Normal Operation
Read/write
Self clearing
0
0.14 Loopback 1 = Enable Loopback Mode
0 = Disable Loopback Mode
When used with a RocketIO
transceiver, the core is placed in
internal loopback mode.
With the TBI version, Bit 1 is
connected to ewrap. When set to ‘1,’
indicates to the external PMA
module to enter loopback mode.
See “Loopback,” page 197.
Read/write 0
RESET
LOOPBACK
AUTO-NEG ENABLE
RESTART AUTO-NEG
RESERVED
POWER DOWN
SPEED
SPEED
15 14 13 12 11 10 7 6 5 0
Reg 0
ISOLATE
9
8
DUPLEX MODE
COLLISION TEST
4
UNIDIRECTIONAL ENABLE
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