LAN9250 datasheet(222/421 Pages) MICROCHIP

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LAN9250

DS00001913A-page 222

 2015 Microchip Technology Inc.

dition to de-assert is true, then the Interrupt Source Flag is cleared and the internal interrupt signal is also deasserted.

If the condition to de-assert is false, then the Interrupt Source Flag remains set, and the internal interrupt signal remains

asserted.

Note 3:

LINKSTAT is the internal link status and is not directly available in any register bit.

12.2.10

PHY POWER-DOWN MODES

There are two PHY power-down modes: General Power-Down Mode and Energy Detect Power-Down Mode. These

modes are described in the following subsections.

TABLE 12-3:

ALTERNATIVE INTERRUPT MODE MANAGEMENT TABLE

Mask

Interrupt Source Flag

Interrupt Source

Event to

Assert

interrupt

Condition

De-assert

Bit to Clear

interrupt

30.9

29.9

Link Up

LINKSTAT

See

Note 3

Link Status

Rising LINK-

STAT

LINKSTAT

low

29.9

30.7

29.7

ENERGYON

17.1

ENERGYON

Rising 17.1

17.1 low

29.7

30.6

29.6

Auto-Negotia-

tion complete

1.5

Auto-Negoti-

ate Com-

plete

Rising 1.5

1.5 low

29.6

30.5

29.5

Remote Fault

Detected

1.4

Remote

Fault

Rising 1.4

1.4 low

29.5

30.4

29.4

Link Down

1.2

Link Status

Falling 1.2

1.2 high

29.4

30.3

29.3

Auto-Negotia-

tion LP Acknowl-

edge

5.14

Acknowl-

edge

Rising 5.14

5.14 low

29.3

30.2

29.2

Parallel Detec-

tion Fault

6.4

Parallel

Detection

Fault

Rising 6.4

6.4 low

29.2

30.1

29.1

Auto-Negotia-

tion Page

Received

6.1

Page

Received

Rising 6.1

6.1 low

29.1

Note:

The Energy On (ENERGYON) bit in the PHY Mode Control/Status Register (PHY_MODE_CON-

TROL_STATUS) is defaulted to a ‘1’ at the start of the signal acquisition process, therefore the INT7 bit in

the PHY Interrupt Source Flags Register (PHY_INTERRUPT_SOURCE) will also read as a ‘1’ at power-

up. If no signal is present, then both Energy On (ENERGYON) and INT7 will clear within a few milliseconds.

Note:

For more information on the various power management features of the device, refer to Section 6.3,

"Power Management," on page 44.

The PHY power-down modes do not reload or reset the PHY registers.

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