LAN9730 Datasheet, PDF (191/222 Pages) SMSC Corporation – High-Speed Inter-Chip (HSIC) USB 2.0

LAN9730/LAN9730i
6.5.12 SPECIAL CONTROL/STATUS INDICATIONS REGISTER
Index (In Decimal): 27
Size:
16 bits
Bits
Description
15 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
14 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.
13 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.
12:5 RESERVED
4 XPOL
Polarity state of the 10BASE-T:
0 = Normal polarity
1 = Reversed polarity
3:0 RESERVED
Type
R/W
NASR
R/W
NASR
R/W
NASR
RO
RO
RO
Default
0b
0b
0b
-
0b
-
 2012-2015 Microchip Technology Inc.
DS00001946A-page 191