I347-AT4 Datasheet, PDF (75/148 Pages) Intel Corporation – Intel® Ethernet Network Connection I347-AT4 Datasheet

Programmer’s Visible State—I347-AT4
Register Name
Checker Control
General Control Register
Late Collision Counters 1 & 2
Late Collision Counters 3 & 4
Late Collision Window Adjust/Link Disconnect
Misc Test
Register Address
Page 6, Register 18
Page 6, Register 20
Page 6, Register 23
Page 6, Register 24
Page 6, Register 25
Page 6, Register 26
Page
97
98
98
99
99
99
4.1.1
Copper Control Register - Page 0, Register 0
Bits
Field
Mode
HW
Rst
15
Copper Reset
R/W, SC 0x0
14
Loopback
R/W
0x0
13
Speed Select
(LSB)
R/W
0x0
12
Auto-Negotiation
Enable
R/W
0x1
SW Rst
Description
SC
0x0
Update
Update
Copper Software Reset. Affects pages 0, 2, 3, 5, and 7.
Writing a 1 to this bit causes the PHY state machines to be
reset. When the reset operation is done, this bit is cleared to 0
automatically. The reset occurs immediately.
1 = PHY reset
0 = Normal operation
When loopback is activated, the transmitter data presented on
TXD is looped back to RXD internally. Link is broken when
loopback is enabled. Loopback speed is determined by
Registers 21_2.2:0.
1 = Enable Loopback
0 = 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_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
Bit 6, 13
11 = Reserved
10 = 1000 Mbps
01 = 100 Mbps
00 = 10 Mbps
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 0 and speed is manually forced to
1000 Mbps in Registers 0.13 and 0.6, then Auto-Negotiation
will still be enabled and only 1000BASE-T full-duplex is
advertised if register 0_0.8 is set to 1, 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.
1 = Enable Auto-Negotiation Process
0 = Disable Auto-Negotiation Process
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