LAN8700 datasheet(40/74 Pages) MICROCHIP

40 / 74 page

LAN8700/LAN8700i

DS00002260A-page 40

 2007-2016 Microchip Technology Inc.

5.3

Interrupt Management

The Management interface supports an interrupt capability that is not a part of the IEEE 802.3 specification. It generates

an active low asynchronous interrupt signal on the nINT output whenever certain events are detected as setup by the

Interrupt Mask Register 30.

The Interrupt system on the Microchip LAN8700/8700I has two modes, a Primary Interrupt mode and an Alternative

Interrupt mode. Both systems will assert the nINT pin low when the corresponding mask bit is set, the difference is how

they de-assert the output interrupt signal nINT.

The Primary interrupt mode is the default interrupt mode after a power-up or hard reset, the Alternative interrupt mode

would need to be setup again after a power-up or hard reset.

5.3.1

PRIMARY INTERRUPT SYSTEM

bit The Primary Interrupt system is the default interrupt mode, (Bit 17.6 = ‘0’). The Primary Interrupt System is always

selected after power-up or hard reset.

29.1

INT1

1 = Auto-Negotiation Page Received

0 = not source of interrupt

RO/

29.0

Reserved

Ignore on read.

RO/

TABLE 5-44:

Address

Name

Description

Mode

Default

30.15:8

Reserved

Write as 0; ignore on read.

30.7:1

Mask Bits

1 = interrupt source is enabled

0 = interrupt source is masked

30.0

Reserved

Write as 0; ignore on read

TABLE 5-45:

Address

Name

Description

Mode

Default

31.15:13

Reserved

Write as 0, ignore on read.

31.12

Autodone

Auto-negotiation done indication:

0 = Auto-negotiation is not done or disabled (or not

active)

1 = Auto-negotiation is done

Note:

This is a duplicate of register 1.5, however

reads to register 31 do not clear status bits.

31.11:10

Reserved

Write as 0, ignore on Read.

31.9:7

Reserved

Write as 0, ignore on Read.

31.6

Enable 4B5B

0 = Bypass encoder/decoder.

1 = enable 4B5B encoding/decoding.

MAC Interface must be configured in MII mode.

31.5

Reserved

Write as 0, ignore on Read.

31.4:2

Speed Indication

HCDSPEED value:

[001]=10Mbps Half-duplex

[101]=10Mbps Full-duplex

[010]=100Base-TX Half-duplex

[110]=100Base-TX Full-duplex

XXX

31.1

Reserved

Write as 0; ignore on Read

31.0

Scramble Disable

0 = enable data scrambling

1 = disable data scrambling,

TABLE 5-43:

Address

Name

Description

Mode

Default

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