LAN9220_12 Datasheet, PDF (45/151 Pages) SMSC Corporation – 16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support

16-bit Non-PCI Small Form Factor 10/100 Ethernet Controller with Variable Voltage I/O & HP Auto-MDIX Support
Datasheet
Note 3.10 The PME interrupt status bit on the INT_STS register (PME_INT) is set regardless of the
setting of PME_EN.
A write to the BYTE_TEST register, regardless of whether a carrier was detected, will return the
LAN9220 to the D0 state and will reset the PM_MODE field to the D0 state. As noted above, the host
is required to check the READY bit and verify that it is set before attempting any other reads or writes
of the device. Before the LAN9220 is fully awake from this state the EDPWRDOWN bit in register 17
of the PHY must be cleared in order to wake the PHY. Do not attempt to clear the EDPWRDOWN bit
until the READY bit is set. After clearing the EDPWRDOWN bit the LAN9220 is ready to resume
normal operation. At this time the WUPS field can be cleared.
Device
BLOCK
PHY
MAC Power
Management
MAC and Host
Interface
Internal Clock
Table 3.10 Power Management States
D0
(NORMAL OPERATION)
Full ON
Full ON
Full ON
D1
(WOL)
Full ON
RX Power Mgmt. Block
On
OFF
D2
(ENERGY DETECT)
Energy Detect Power-Down
OFF
OFF
Full ON
Full ON
OFF
KEY
CLOCK ON
BLOCK DISABLED – CLOCK ON
FULL OFF
SMSC LAN9220
45
DATASHEET
Revision 2.9 (03-01-12)