Technical data

1.3.5 Miscellaneous Functions

This chapter summarizes some additional functions of the PHYs.

(1) LED indicators

Six LED signals are provided per PHY. These provide a convenient means to determine the operation

mode of the PHYs. All LED signals are active low. The LED signals are made available through the

GPIO pins of the ERTEC 200. The functions of the LED signals are as follows:

• 100BASE-TX/FX status

This signal shows, that operation speed is 100Mbps or during Auto-Negotiation; this signal will

go inactive when the operating speed is 10Mbps or during line isolation.

• 10BASE-T status

This signal shows, that operation speed is 10Mbps; this signal will go inactive when the

operating speed is 100Mbps or during line isolation.

• Link status

This signal shows, that the PHY detects a valid link. The use of the 10Mbps or 100Mbps link

test status is determined by the condition of the internally determined speed selection.

• Full/Half Duplex

This signal shows, whether the established link is operating in full or half duplex mode; it is

active in full duplex mode.

• Transmit Activity

This signal shows, that CRS_P(2:1) is active (high) at transmit. When CRS becomes inactive,

the transmit activity LED output is extended by 128ms in order to improve visibility.

• Receive Activity

This signal shows, that CRS_P(2:1) is active (high) at receive. When CRS becomes inactive,

the receive activity LED output is extended by 128ms in order to improve visibility. In loopback

mode, this LED is not active.

Table 3 illustrates how the LED signals are made available at the GPIO pins.

Function

GPIO pin

1 2 3

GPIO0 P1-DUPLEX-LED_N - -

GPIO1 P2-DUPLEX-LED_N - -

GPIO2 P1-SPEED-100LED_N (TX/FX) P1-SPEED-10LED_N -

GPIO3 P2-SPEED-100LED_N (TX/FX) P2-SPEED-10LED_N -

GPIO4 P1-LINK-LED_N - -

GPIO5 P2-LINK-LED_N - -

GPIO6 P1-RX-LED_N P1-TX-LED_N P1-ACTIVE-LED_N

GPIO7 P2-RX-LED_N P2-TX-LED_N P2-ACTIVE-LED_N

Table 3: Assignment of LED Signals to GPIO Pins

Technical data subject to change Version 1.0.0