KSZ9567R_V01 datasheet(26/233 Pages) MICROCHIP

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KSZ9567R

DS00002329E-page 26

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4.2

LEDs

Each PHY port has two programmable LED output pins, LEDx_0 and LEDx_1, to indicate the PHY link and activity sta-

tus. Two different LED modes are available. The LED mode can be changed individually for each PHY port by writing

to the PHY Mode bit in the PHY indirect register: MMD 2, address 0, bit 4:

•1 = Single-LED Mode

•0 = Tri-Color Dual-LED Mode (Default)

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

low.

4.2.1

SINGLE-LED MODE

In single-LED mode, the LEDx_1 pin indicates the link status while the LEDx_0 pin indicates the activity status, as shown

in Figure 4-2.

4.2.2

TRI-COLOR DUAL-LED MODE

In tri-color dual-LED mode, the link and activity status are indicated by the LEDx_1 pin for 1000BASE-T; by the LEDx_0

pin for 100BASE-TX; and by both LEDx_1 and LEDx_0 pins, working in conjunction, for 10BASE-T. This behavior is

summarized in Figure 4-3.

4.3

Media Access Controller (MAC)

4.3.1

MAC OPERATION

The device strictly abides by IEEE 802.3 standards to maximize compatibility. Additionally, there is an added MAC fil-

tering function to filter unicast packets. The MAC filtering function is useful in applications, such as VoIP, where restrict-

ing certain packets reduces congestion and thus improves performance.

The transmit MAC takes data from the egress buffer and creates full Ethernet frames by adding the preamble and the

start-of-frame delimiter ahead of the data, and generates the FCS that is appended to the end of the frame. It also sends

flow control packets as needed.

TABLE 4-2:

SINGLE-LED MODE PIN DEFINITION

LED Pin

Pin State

Pin LED Definition

Link/Activity

LEDx_1

HOFF

Link Off

Link On (any speed)

LEDx_0

OFF

No Activity

Toggle

Blinking

Activity (RX,TX)

TABLE 4-3:

TRI-COLOR DUAL-LED MODE PIN DEFINITION

LED Pin (State)

LED Pin (Definition)

Link/Activity

LEDx_1

LEDx_0

LEDx_1

LEDx_0

OFF

Link off

OFF

1000Mbps Link / No Activity

Toggle

Blinking

OFF

1000Mbps Link / Activity (RX,TX)

OFF

100Mbps Link / No Activity

Toggle

OFF

Blinking

100Mbps Link / Activity (RX,TX)

10Mbps Link / No Activity

Toggle

Blinking

10Mbps Link / Activity (RX,TX)

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