LAN9500AI datasheet(185/213 Pages) MICROCHIP

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DS00001875A-page 185

LAN950x

7.5.11

SPECIAL CONTROL/STATUS INDICATIONS REGISTER

Index (In Decimal):

Size:

16 bits

Bits

Description

Type

Default

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

R/W

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.

R/W

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.

R/W

12:11

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.

R/W

NASR

9:5

RESERVED

XPOL

Polarity state of the 10BASE-T:

0 = Normal polarity

1 = Reversed polarity

3:0

RESERVED

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