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DM9081 Scheda tecnica(PDF) 9 Page - List of Unclassifed Manufacturers

Il numero della parte DM9081
Spiegazioni elettronici  10BASE-T Hub Controller
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DM9081
Final
9
Version: DM9081-DS-F01
April 22, 1997
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


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