LAN9500 Datasheet, PDF (185/213 Pages) SMSC Corporation – USB 2.0 to 10/100 Ethernet Controller Promiscuous mode

LAN950x
7.5.11 SPECIAL CONTROL/STATUS INDICATIONS REGISTER
Index (In Decimal): 27
Size:
16 bits
Bits
15
14
13
12:11
10
9:5
4
3:0
Description
Override AUTOMDIX_EN Strap
0 = AUTOMDIX_EN configuration strap enables or disables HP Auto MDIX
1 = Override AUTOMDIX_EN configuration strap. PHY Register 27.14 and
27.13 determine MDIX function
Auto-MDIX Enable
Only effective when 27.15=1, otherwise ignored.
0 = Disable Auto-MDIX. 27.13 determines normal or reversed connection.
1 = Enable Auto-MDIX. 27.13 must be set to 0.
Auto-MDIX State
Only effective when 27.15=1, otherwise ignored.
When 27.14 = 0 (manually set MDIX state):
0 = no crossover (TPO = output, TPI = input)
1 = crossover (TPO = input, TPI = output)
When 27.14 = 1 (automatic MDIX) this bit must be set to 0.
Do not use the combination 27.15=1, 27.14=1, 27.13=1.
RESERVED
VCOOFF_LP
Forces the Receive PLL 10M to lock on the reference clock at all times:
0 = Receive PLL 10M can lock on reference or line as needed (normal
operation).
1 = Receive PLL 10M is locked on the reference clock. In this mode 10M
data packets cannot be received.
RESERVED
XPOL
Polarity state of the 10BASE-T:
0 = Normal polarity
1 = Reversed polarity
RESERVED
Type
R/W
R/W
R/W
RO
R/W
NASR
RO
RO
RO
Default
0b
0b
0b
-
0b
-
0b
-
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DS00001875A-page 185