KSZ9031RNX(2012) Ver la hoja de datos (PDF) - Micrel

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componentes Descripción

Fabricante

KSZ9031RNX
(Rev.:2012)

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9031RNX

Strapping Options

Pin Number

35

15

17

Pin Name

PHYAD2

PHYAD1

PHYAD0

27

MODE3

28

MODE2

31

MODE1

32

MODE0

33

CLK125_EN

41

LED_MODE

Note:

1. I/O = Bi-directional.

Type(1)

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

I/O

Pin Function

The PHY address, PHYAD[2:0], is sampled and latched at power-up/reset and is

configurable to any value from 0 to 7. Each PHY address bit is configured as follows:

Pull-up = 1

Pull-down = 0

PHY address bits [4:3] are always set to ‘00’.

The MODE[3:0] strap-in pins are sampled and latched at power-up/reset as follows:

MODE[3:0]

Mode

0000

Reserved – not used

0001

Reserved – not used

0010

Reserved – not used

0011

Reserved – not used

0100

NAND tree mode

0101

Reserved – not used

0110

Reserved – not used

0111

Chip power-down mode

1000

Reserved – not used

1001

Reserved – not used

1010

Reserved – not used

1011

Reserved – not used

1100

RGMII mode – advertise 1000Base-T full-duplex only

1101

RGMII mode – advertise 1000Base-T full- and half-duplex only

1110

RGMII mode – advertise all capabilities (10/100/1000 speed

half-/full-duplex), except 1000Base-T half-duplex

1111

RGMII mode – advertise all capabilities (10/100/1000 speed

half-/full-duplex)

CLK125_EN is sampled and latched at power-up/reset and is defined as follows:

Pull-up = Enable 125MHz clock output

Pull-down = Disable 125MHz clock output

Pin 41 (CLK125_NDO) provides the 125MHz reference clock output option for use by

the MAC.

LED_MODE is latched at power-up/reset and is defined as follows:

Pull-up = Single-LED mode

Pull-down = Tri-color dual-LED mode

Pin strap-ins are latched during power-up or reset. In some systems, the MAC receive input pins may be driven during

power-up or reset, and consequently cause the PHY strap-in pins on the RGMII signals to be latched to an incorrect

configuration. In this case, Micrel recommends adding external pull-ups/pull-downs on the PHY strap-in pins to ensure the

PHY is configured to the correct pin strap-in mode.

October 2012

15

M9999-103112-1.0

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