LAN9220 datasheet(111/142 Pages) MICROCHIP

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DS00002417A-page 111

LAN9220

5.5.10

SPECIAL CONTROL/STATUS INDICATIONS

Index (In Decimal):

Size:

16-bits

Address

Description

Mode

Default

Override AMDIX Strap

0 - AMDIX_EN (pin 52) enables or disables HP Auto MDIX

1 - Override pin 52. 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.

12:11

Reserved: Write as 0. Ignore on read.

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.

RW,

NASR

9-5

Reserved: Write as 0. Ignore on read.

XPOL: Polarity state of the 10Base-T:

0 - Normal polarity

1 - Reversed polarity

3:0

Reserved: Read only - Writing to these bits have no effect.

XXXXb

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