Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
4.2.8
Mode Control/Status Register
Index (In Decimal): 17
Size:
16 bits
BITS
DESCRIPTION
TYPE
DEFAULT
15:14
13
RESERVED
RO
-
EDPWRDOWN
R/W
0b
Enable the Energy Detect Power-Down mode:
0 = Energy Detect Power-Down is disabled
1 = Energy Detect Power-Down is enabled
12:10
9
RESERVED
RO
-
FARLOOPBACK
R/W
0b
Enables far loopback mode (i.e., all the received packets are sent back
simultaneously (in 100BASE-TX only)). This mode works even if the Isolate
bit (0.10) is set.
0 = Far loopback mode is disabled
1 = Far loopback mode is enabled
Refer to Section 3.8.8.2, "Far Loopback," on page 40 for additional
information.
8:7
6
RESERVED
RO
-
ALTINT
Alternate Interrupt Mode:
R/W
0b
0 = Primary interrupt system enabled (Default)
1 = Alternate interrupt system enabled
Refer to Section 3.6, "Interrupt Management," on page 29 for additional
information.
5:2
1
RESERVED
RO
RO
-
ENERGYON
1b
Indicates whether energy is detected. This bit transitions to “0” if no valid
energy is detected within 256ms. It is reset to “1” by a hardware reset and
is unaffected by a software reset. Refer to Section 3.8.3.2, "Energy Detect
Power-Down," on page 38 for additional information.
0
RESERVED
R/W
0b
Revision 1.4 (08-23-12)
56
SMSC LAN8720A/LAN8720Ai
DATASHEET
SMSC [ SMSC CORPORATION ]
