LAN9312 datasheet(165/458 Pages) SMSC

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High Performance Two Port 10/100 Managed Ethernet Switch with 32-Bit Non-PCI CPU Interface

Datasheet

SMSC LAN9312

165

Revision 1.2 (04-08-08)

DATASHEET

The various LED indication functions shown in Table 13.1 are described below:

TX Port 0 -

The signal is pulsed low for 80mS to indicate activity from the switch fabric to the Host

MAC. This signal is then driven high for a minimum of 80mS, after which the process will repeat if

TX activity is again detected.

RX Port 0 -

The signal is pulsed low for 80mS to indicate activity from the Host MAC to the switch

fabric. This signal is then driven high for a minimum of 80mS, after which the process will repeat

if RX activity is again detected.

Link / Activity -

A steady low output indicates that the port has a valid link, while a steady high

indicates no link on the port. The signal is pulsed high for 80mS to indicate transmit or receive

activity on the port. The signal is then driven low for a minimum of 80mS, after which the process

will repeat if RX or TX activity is again detected.

Full-duplex / Collision -

A steady low output indicates the port is in full-duplex mode, while a

steady high indicates no link on the port. In half-duplex mode, the signal is pulsed low for 80mS

to indicate a network collision. The signal is then driven high for a minimum of 80mS, after which

the process will repeat if another collision is detected.

Speed -

A steady low output indicates the selected speed is 100Mbps. A steady high output

indicates the selected speed is 10Mbps. The signal will be held high if the port does not have a

valid link.

100Link / Activity -

A steady low output indicates the port has a valid link and the speed is

100Mbps. The signal is pulsed high for 80mS to indicate TX or RX activity on the port. The signal

is then driven low for a minimum of 80mS, after which the process will repeat if RX or TX activity

is again detected. The signal will be held high if the port does not have a valid link.

10Link / Activity -

A steady low output indicates the port has a valid link and the speed is 10Mbps.

The signal is pulsed high for 80mS to indicate transmit or receive activity on the port. The signal

is then driven low for a minimum of 80mS, after which the process will repeat if RX or TX activity

is again detected. This signal will be held high if the port does not have a valid link.

Activity -

The signal is pulsed low for 80mS to indicate transmit or receive activity. The signal is

then driven high for a minimum of 80mS, after which the process will repeat if RX or TX activity is

again detected. The signal will be held high if the port does not have a valid link.

Link -

A steady low indicates the port has a valid link.

TXEN Port 0 -

Non-stretched TXEN signal from the switch fabric to the Host MAC.

RXDV Port 0 -

Non-stretched RXDV signal from the Host MAC to the switch fabric.

TXEN -

Non-stretched TXEN signal from the switch fabric to the PHY.

RXDV -

Non-stretched RXDV signal from the PHY to the switch fabric.

nP1LED1

(GPIO1)

Full-duplex / Collision

Port 1

Full-duplex / Collision

Port 1

Full-duplex / Collision

Port 1

TXEN

Port 1

nP1LED0

(GPIO0)

Speed

Port 1

10Link / Activity

Port 1

Speed

Port 1

RXDV

Port 1

Table 13.1 LED Operation as a Function of LED_CFG[9:8] (continued)

LED_CFG[9:8] (LED_FUN[1:0])

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