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

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Fabricante

KSZ9031RNX
(Rev.:2012)

Gigabit Ethernet Transceiver with RGMII Support

Micrel 

Micrel, Inc.

KSZ9031RNX

Interrupt (INT_N)

The INT_N pin is an optional interrupt signal that is used to inform the external controller that there has been a status

update in the KSZ9031RNX PHY register. Bits [15:8] of register 1Bh are the interrupt control bits that enable and disable

the conditions for asserting the INT_N signal. Bits [7:0] of register 1Bh are the interrupt status bits that indicate which

interrupt conditions have occurred. The interrupt status bits are cleared after reading register 1Bh.

Bit [14] of register 1Fh sets the interrupt level to active high or active low. The default is active low.

The MII Management bus option gives the MAC processor complete access to the KSZ9031RNX control and status

registers. Additionally, an interrupt pin eliminates the need for the processor to poll the PHY for status change.

LED Mode

The KSZ9031RNX provides two programmable LED output pins, LED2 and LED1, which are configurable to support two

LED modes. The LED mode is configured by the LED_MODE strap-in (pin 41). It is latched at power-up/reset and is

defined as follows:

• Pull-up: Single-LED mode

• Pull-down: Tri-color dual-LED mode

Single-LED Mode

In single-LED mode, the LED2 pin indicates the link status while the LED1 pin indicates the activity status, as shown in

Table 9.

LED Pin

LED2

LED1

Pin State

H

L

H

Toggle

LED Definition Link/Activity

OFF

ON

OFF

Blinking

Link off

Link on (any speed)

No activity

Activity (RX, TX)

Table 9. Single-LED Mode – Pin Definition

Tri-color Dual-LED Mode

In tri-color dual-LED mode, the link and activity status are indicated by the LED2 pin for 1000Base-T; by the LED1 pin for

100Base-TX; and by both LED2 and LED1 pins, working in conjunction, for 10Base-T. This is summarized in Table 10.

LED Pin

(State)

LED2

H

L

Toggle

H

H

L

Toggle

LED1

H

H

H

L

Toggle

L

Toggle

LED Pin

(Definition)

LED2 LED1

OFF

OFF

ON

OFF

Blinking OFF

OFF

ON

OFF

Blinking

ON

ON

Blinking Blinking

Link/Activity

Link off

1000 Link / No activity

1000 Link / Activity (RX, TX)

100 Link / No activity

100 Link / Activity (RX, TX)

10 Link / No activity

10 Link / Activity (RX, TX)

Table 10. Tri-color Dual-LED Mode – Pin Definition

Each LED output pin can directly drive an LED with a series resistor (typically 220Ω to 470Ω).

October 2012

28

M9999-103112-1.0

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