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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
Revision 1.0 (05-28-09) 46 SMSC LAN8720/LAN8720i
DATASHEET
Table 5.32 Register 27 - Special Control/Status Indications
ADDRESS NAME DESCRIPTION MODE DEFAULT
27.15 AMDIXCTRL HP Auto-MDIX control
0 - Auto-MDIX enable
1 - Auto-MDIX disabled (use 27.13 to control channel)
RW 0
27.14 Reserved Reserved RW 0
27.13 CH_SELECT Manual Channel Select
0 - MDI -TX transmits RX receives
1 - MDIX -TX receives RX transmits
RW 0
27.12 Reserved Write as 0. Ignore on read. RW 0
27:11 SQEOFF Disable the SQE (Signal Quality Error) test
(Heartbeat):
0 - SQE test is enabled.
1 - SQE test is disabled.
RW,
NASR
0
27.10:5 Reserved Write as 0. Ignore on read. RW 000000
27.4 XPOL Polarity state of the 10Base-T:
0 - Normal polarity
1 - Reversed polarity
RO 0
27.3:0 Reserved Reserved RO XXXXb
Table 5.33 Register 28 - Special Internal Testability Controls
ADDRESS NAME DESCRIPTION MODE DEFAULT
28.15:0 Reserved Do not write to this register. Ignore on read. RW N/A
Table 5.34 Register 29 - Interrupt Source Flags
ADDRESS NAME DESCRIPTION MODE DEFAULT
29.15:8 Reserved Ignore on read. RO/
LH
0
29.7 INT7 1 = ENERGYON generated
0 = not source of interrupt
RO/
LH
X
29.6 INT6 1 = Auto-Negotiation complete
0 = not source of interrupt
RO/
LH
X
29.5 INT5 1 = Remote Fault Detected
0 = not source of interrupt
RO/
LH
X
29.4 INT4 1 = Link Down (link status negated)
0 = not source of interrupt
RO/
LH
X
29.3 INT3 1 = Auto-Negotiation LP Acknowledge
0 = not source of interrupt
RO/
LH
X
29.2 INT2 1 = Parallel Detection Fault
0 = not source of interrupt
RO/
LH
X