VSC8221 datasheet(21/138 Pages) MICROSEMI

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VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

21 of 26

MDiNT

Management Data interrupt

MDiNT is asserted whenever there is a change in the operating status of the

device. This open drain signal indicates a change in the PHY's link operating

conditions for which a Station Manager must interrogate to determine further

information. See Mii Register 25 and Mii Register 26 for more information.

The assertion polarity of MDiNT is determined by the presence of a pull-up or

pulldown on the MDiNT pin.

if the MDiNT pin is pulled up to VDDiOMiCRO using a 4.7k

Ω το 10kΩ resistor, it

becomes an active low signal.

if the MDiNT pin is pulled down using a 4.7k

Ω το 10kΩ resistor, then it becomes

an active high signal.

Table 9. EEPROM interface Signals

100 TFBGA

BALL

Signal Name

Type

Description

EECLK/

PLLMODE

OZC/iPD

EECLK - EEPROM Clock Output.

This output is the clock line of the two-wire, MSA compliant, serial EEPROM

interface. This pin should be connected to the SCL input pin of the AT24 series of

Atmel EEPROMs. Refer to “EEPROM interface,” page 57 for details.

PLLMODE - PLL Mode Select input.

PLLMODE is sampled during the device power-up sequence or on reset. When

PLLMODE is high, the PHY expects a 125MHz clock input as the PHY's

reference clock.

When low (default), a reference clock of 25MHz is expected at the REFCLK pin

from either an external crystal or a clock reference. This pin is internally pulled

down with a 100k

Ω resistor.

EEDAT

OZC/iPD

EEPROM Serial i/O Data.

This bidirectional signal is the data line of the two wire, MSA compliant, serial

EEPROM interface. This pin should be connected to the SDA pin of the AT24

series of Atmel EEPROMs. Refer to “EEPROM interface,” page 57 for details.

The PHY determines that an external EEPROM is present by monitoring the

EEDAT pin at power-up or when RESET is de-asserted. if EEDAT has a 4.7k

Ω -

10k

Ω external pull-up (to VDDiOMiCRO) resistor, it assumes an EEPROM is

present. The EEDAT pin can be left floating or grounded to indicate no EEPROM.

Table 8. Serial Management interface Signals (continued)

100 TFBGA

BALL

Signal Name

Type

Description

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