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SMSC LAN8720i User Manual

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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