DM9081FP DAVICOM [Davicom Semiconductor, Inc.], DM9081FP Datasheet - Page 9

• Manufacturer Part Number: DM9081FP
• Description: 10BASE-T Hub Controller
• Manufacturer: DAVICOM [Davicom Semiconductor, Inc.]

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.
Final
Version: DM9081-DS-F02
February 02, 2001
Figure 2. Minimum Mode Implementation
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.
10BASE-T Hub Controller
DM9081
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