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78Q2133_F

MicroPHY™ 10/100BASE-TX Transceiver

Unspecified 

78Q2123/78Q2133 MicroPHY™

10/100BASE-TX Transceiver

LED SIGNALS (PROGRAMMABILITY IS SECONDARY REQUIREMENT)

SIGNAL PIN TYPE DESCRIPTION

LED0

4

CO PROGRAMMABLE LED. Active low. Default status: LINK OK. Active to indicate

link with far end PHY.

LED1

3

CO PROGRAMMABLE LED. Active low. Default status: RX or TX ACTIVITY. Active

to indicate TX or RX activity on the MDI.

Other LED options selectable via MR23:

TRANSMIT: ON when there is a transmission (normally OFF).

RECEIVE: ON when there is a reception (normally OFF).

COLLISION: In half duplex mode, this is a collision indicator and turns-ON when a collision

occurs. In full duplex mode, this LED is held OFF.

BASE-TX: ON for 100BASE-TX connection and OFF for other connections.

LEDBTX is OFF during auto-negotiation.

BASE-T: ON for 10BASE-T connection and OFF for other connections. LEDBT is

OFF during auto-negotiation.

FULL DUPLEX: ON when in full duplex mode and OFF when in half duplex mode.

LINK/ACT: ON for link, blink for activity.

Page: 10 of 42

© 2009 Teridian Semiconductor Corporation

Rev 1.5

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