Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
4.2.11
Special Control/Status Indications Register
Index (In Decimal): 27
Size:
16 bits
BITS
DESCRIPTION
TYPE
DEFAULT
15
AMDIXCTRL
R/W
0b
HP Auto-MDIX control:
0 = Enable Auto-MDIX
1 = Disable Auto-MDIX (use 27.13 to control channel)
14
13
RESERVED
RO
-
CH_SELECT
Manual channel select:
0 = MDI (TX transmits, RX receives)
1 = MDIX (TX receives, RX transmits)
R/W
0b
12
11
RESERVED
RO
-
SQEOFF
R/W
NASR
0b
Disable the SQE test (Heartbeat):
0 = SQE test is enabled
1 = SQE test is disabled
10:5
4
RESERVED
RO
RO
-
XPOL
0b
Polarity state of the 10BASE-T:
0 = Normal polarity
1 = Reversed polarity
3:0
RESERVED
RO
-
SMSC LAN8720A/LAN8720Ai
59
Revision 1.4 (08-23-12)
DATASHEET
SMSC [ SMSC CORPORATION ]
