Data Sheet

Programming Interface — Ethernet Controller I210
553
12
Auto-Negotiation
Enable
R/W 0x1 Update
Changes to this bit are disruptive to the normal operation. A write
to this register bit does not take effect until any one of the
following occurs:
• Software reset is asserted (register 0_0.15).
• Restart auto-negotiation is asserted (register 0_0.9).
• Power down (register 0_0.11, 16_0.2) transitions from power
down to normal operation.
If register 0_0.12 is set to 0b and speed is manually forced to
1000 Mb/s in registers 0.13 and 0.6, then auto-negotiation is still
enabled and only 1000BASE-T full-duplex is advertised if register
0_0.8 is set to 1b, and 1000BASE-T half-duplex is advertised if
0.8 is set to 0.
Registers 4.8:5 and 9.9:8 are ignored. Auto-negotiation is
mandatory per IEEE for proper operation in 1000BASE-T.
1b = Enable auto-negotiation process.
0b = Disable auto-negotiation process.
11 Power Down R/W Retain
Power down is controlled via register 0_0.11 and 16_0.2. Both
bits must be set to 0b before the PHY transitions from power
down to normal operation.
When the port is switched from power down to normal operation,
software reset and restart auto-negotiation are performed even
when bits Reset (0_0.15) and Restart Auto-Negotiation (0_0.9)
are not set by the user.
1b = Power down.
0b = Normal operation.
10 Isolate RO 0x0 0x0 This bit has no effect.
9
Restart Copper
Auto-Negotiation
R/W, SC 0x0 SC
Auto-negotiation automatically restarts after hardware or
software reset regardless of whether or not the restart bit (0.9) is
set.
1b = Restart auto-negotiation process.
0b = Normal operation.
8
Copper Duplex
Mode
R/W 0x1 Update
Changes to this bit are disruptive to the normal operation.As a
result, any changes to these registers must be followed by a
software reset to take effect.
A write to this register bit does not take effect until any one of the
following also occurs:
• Software reset is asserted (Register 0_0.15).
• Restart Auto-Negotiation is asserted (Register 0_0.9).
• Power down (Register 0_0.11, 16_0.2) transitions from
power down to normal operation.
1 = Full duplex.
0 = Half duplex.