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DM9081

10 BASE-T hub controller

Davicom Semiconductor, Inc. 

DM9081

10BASE-T Hub Controller

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-F02

February 02, 2001

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