LAN8720 datasheet(46/79 Pages) SMSC

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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support

Datasheet

Revision 1.0 (05-28-09)

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)

27.14

Reserved

27.13

CH_SELECT

Manual Channel Select

0 - MDI -TX transmits RX receives

1 - MDIX -TX receives RX transmits

27.12

Reserved

Write as 0. Ignore on read.

27:11

SQEOFF

Disable the SQE (Signal Quality Error) test

(Heartbeat):

0 - SQE test is enabled.

1 - SQE test is disabled.

RW,

NASR

27.10:5

Reserved

Write as 0. Ignore on read.

000000

27.4

XPOL

Polarity state of the 10Base-T:

0 - Normal polarity

1 - Reversed polarity

27.3:0

Reserved

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.

N/A

Table 5.34 Register 29 - Interrupt Source Flags

ADDRESS

NAME

DESCRIPTION

MODE

DEFAULT

29.15:8

Reserved

Ignore on read.

RO/

29.7

INT7

1 = ENERGYON generated

0 = not source of interrupt

RO/

29.6

INT6

1 = Auto-Negotiation complete

0 = not source of interrupt

RO/

29.5

INT5

1 = Remote Fault Detected

0 = not source of interrupt

RO/

29.4

INT4

1 = Link Down (link status negated)

0 = not source of interrupt

RO/

29.3

INT3

1 = Auto-Negotiation LP Acknowledge

0 = not source of interrupt

RO/

29.2

INT2

1 = Parallel Detection Fault

0 = not source of interrupt

RO/

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