SMSC LAN9420 - Manual (Page 143)

Single-Chip Ethernet Controller with HP Auto-MDIX Support and PCI Interface
Datasheet
SMSC LAN9420/LAN9420i 143 Revision 1.22 (09-25-08)
DATASHEET
4.5.8 Mode Control/Status
Index (In Decimal): 17 Size: 16 bits
BITS DESCRIPTION TYPE DEFAULT
15:14 RESERVED RO -
13 EDPWRDOWN
Enable the Energy Detect Power-Down mode:
0=Energy Detect Power-Down is disabled
1=Energy Detect Power-Down is enabled R/W 0b
12:2 RESERVED RO -
1 ENERGYON
Indicates whether energy is detected. This bit goes to a “0” if no valid
energy is detected within 256ms. Reset to “1” by hardware reset, unaffected
by SW reset. RO 1b
0 RESERVED R/W 0b