82583V Datasheet, PDF (269/374 Pages) Intel Corporation – Intel® 82583V GbE Controller

Driver Programing Interface—82583V GbE Controller
9.2.8.1
Control Register (Any Page), PHY Address 01; Register 0
Bits
Field
Mode
15
Reset
R/W, SC
14
Loopback
R/W
13
Speed
Select (LSB)
R/W
Auto-
12
Negotiation R/W
Enable
HW Rst
0x0
0x0
0x0
0x1
SW Rst
Description
SC
0x0
Update
Update
PHY Software Reset.
Writing a 1b to this bit causes the PHY state
machines to be reset. When the reset operation
completes, this bit is automatically cleared to 0b.
The reset occurs immediately.
1b = PHY reset.
0b = Normal operation.
When loopback is activated, the transmitter data
presented on TXD is looped back to RXD internally.
The link is broken when loopback is enabled.
Loopback speed is determined by registers
21_2.2:0.
1b = Enable loopback.
0b = Disable loopback.
Changes to this bit are disruptive to the normal
operation; therefore, 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 0.15).
• Restart auto-negotiation is asserted (register
0.9).
• Power down (register 0.11, 16_0.2) transitions
from power down to normal operation (bit 6,
13).
11b = Reserved.
10b = 1000 Mb/s.
01b = 100 Mb/s.
00b = 10 Mb/s.
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 0.15).
• Restart auto-negotiation is asserted (register
0.9).
• Power down (register 0.11, 16_0.2) transitions
from power down to normal operation.
If register 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 0.8
is set to 1b, and 1000BASE-T half-duplex is
advertised if register 0.8 is set to 0b. 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.
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