Intel PCI Manual Do Utilizador

241

Reserved

5:0

These bits are reserved and should be 
set to 000000b.

RO
RW

1

Always 
000000b

Speed Selection 
(MSB)

6

Speed Selection is determined by bits 6 
(MSB) and 13 (LSB) as follows.
11b = Reserved
10b = 1000 Mbps
01b = 100 Mbps
00b = 10 Mbps
A write to these bits do not take effect 
until a software reset is asserted, 
Restart Auto-Negotiation is asserted, or 
Power Down transitions from power 
down to normal operation.
82544GC/EI only:
The Speed Selection bits take on the 
values set by external pins ANEG[3:0] 
on hardware reset only.
Bit 6: ANEG[3] | ANEG[2] | (MODE[3:0] 
is one of xx01b, 1x00b, 001xb, 0111b).
Bit 13: (ANEG[3:1] = 001b) and 
(MODE[3:0] is not any of xx01b, 1x00b, 
001xb, 0111b).

R/W

1b

ANEG[3:2]
MODE[3:0]

Update

Collision Test

7

1b = Enable COL signal test.
0b = Disable COL signal test.

R/W

0b

0b

Duplex Mode

8

1b = Full Duplex.
0b = Half Duplex.
82544GC/EI only:
The Duplex bit takes on the value set by 
external pins ANEG[3:2, 0] on hardware 
reset only.
Bit 8: ANEG[3:2,0] = 001 | ANEG[3].
A write to this bit does not take effect 
until a software reset is asserted, 
Restart Auto-Negotiation is asserted, or 
Power Down transitions from power 
down to normal power.

R/W

1b

ANEG[3:2,
0]

Update

Restart Auto-
Negotiation

9

1b = Restart Auto-Negotiation Process.
0b = Normal operation.
Auto-Negotiation automatically restarts 
after hardware or software reset 
regardless of whether or not the restart 
bit is set.

R/W, 
SC

0b

Self 
Clear

Isolate

10

1b = Isolate.
0b = Normal operation.

R/W

0b

0b