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DM9081F

10BASE-T Hub Controller

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DM9081

LED Functions

The DM9081 provides LED functions to monitor the TP

and AUI ports.

Collision Status

The COL_LED pin displays the collision status of the

DM9081. When the DM9081 detects a collision, the

COL_LED will drive low for more than 26ms and less

than 52ms.

AUI1 Port Status

The AUI1_CRS_LED displays the AUI1 port status of the

DM9081. When the DM9081 receives a data packet from

AUI1 port, the AUI1_CRS_LED pin will drive low for

52ms, then drive high at least 78ms until it responds to the

next packet.

AUI2 Port Status

The AUI2_CRS_LED displays the AUI2 port status of the

DM9081. When the DM9081 receives a data packet from

the AUI2 port, the AUI2_CRS_LED pin will drive low for

52ms, then drive high at least 78ms until it responds to the

next packet.

Minimum Mode

In minimum mode, TESTPIN0 and TESTPIN2 should be

pulled low and LI/RXn (n = 0~7) pins drive the LED

without using external TTL logic. The description is given

below in "TP Ports Status."

TP Ports Status

The LI/RXn (n=0~7) pin sends out the status for TP ports

0-7 of the DM9081. In link test fail state, the LI/RXn pin

is driven high. In link test pass, the LI/RXn pin is driven

low. When TP port receives a packet, the LI/RXn pin is

driven high for 78ms, then driven low at least 52ms until

it responds to the next packet. An example is shown in

Figure 2.

Figure 2. Minimum Mode Implementation

Final

9

Version: DM9081-DS-F01

April 22, 1997

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