IP101ALF-DS-R08 datasheet(25/36 Pages) ETC2

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IP101A LF

Data Sheet

Auto MDIX function

IP101A LF will keep sensing incoming signal in MDI RX pair, if no incoming signal is detected, IP101A LF

will switch TX and RX pairs automatically trying to establish connection. IP101A LF supports this function

both in Auto-Negotiation mode and force mode.

LED Configuration

IP101A LF provides 2 LED operation modes,

Mode 1

(default):

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Oct 22, 2007

IP101A LF-DS-R12

LED

Function

LED0

Link status: Active indicates the link has established

LED1

Duplex operation: Active indicates full duplex

LED2

10BT/ACT: Active indicates 10Mbps connection has established, and blinking while

TX/RX events occur.

LED3

100BT/ACT: Active indicates 100Mbps connection has established, and blinking

while TX/RX events occur.

LED4

Collision detect: Active indicates Collision has occurred

Mode 2

(could be set by pulling up CRS with a 4.7K resistor):

LED

Function

LED0

Link/ACT: Active indicates the link has established, and blinking while TX/RX events

occur.

LED1

Duplex/COL: Active indicates full duplex, and blinking while collision events occur.

LED2

10BT: Active indicates 10Mbps connection has established

LED3

100BT: Active indicates 100Mbps connection has established

LED4

Reserved.

LED pins also include the information of PHY address, the default PHY address is set at 00001b (01h).

The PHY address can be modified by changing the LED circuitry. The modification can be arranged as

follow:

LEDx {X=0:4}

R26

510 ohm

R27

5.1k ohm

VDD33

LED

R27

5.1k ohm

LED

LEDx {X=0:4}

R26

510 ohm

Figure 3: PHY address Configuration

The left diagram will enable the specific PHY address to 1, if it is connected to VDD33. The diagram on

the right shows the configuration for setting PHY address to 0, when the circuit is connected to ground.

By setting either one of the bits according to the diagram will allow one to modify PHY addresses from

PHYAD0 to PHYAD4.

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