Intel PCI 사용자 설명서

242

Power Down

11

1b = Power down.
0b = Normal operation.
Power down shuts down the Ethernet 
controller except for the MAC interface if 
the MAC interface power down bit is set 
to 1b. If it equals 0b, then the MAC 
interface also shuts down. For the 
82544GC/EI, power down has no effect 
on the 125CLK output if the Disable 
125CLK bit is set to 0b.
NOTE: Setting this bit to 1b will prevent 

wakeup by detecting circuitry 
on the CAT5 cable. To enable 
wakeup, this bit must be written 
back to 0b.

82544GC/EI only:
If bit 12 is set to 0b and speed is 
manually forced to 1000 Mb/s in bits 13 
and 6, then Auto-Negotiation is still 
enabled and only 1000BASE-T full 
duplex is advertised if bit 8 is set to 1b. 
1000BASE-T half duplex is advertised if 
bit 8 is cleared (0b). Duplex settings in 
other registers are ignored. Auto-
Negotiation is required by IEEE for 
proper operation in 1000BASE-T.

R/W

0b

0b