DM9095L View Datasheet(PDF) - Davicom Semiconductor, Inc.
Part Name
Description
Manufacturer
DM9095L Datasheet PDF : 21 Pages
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Overview
The DM9095 provides the interface between an AUI and
a TP wire. The receive, transmit, and collision detection
functions of the DM9095 are designed to meet the IEEE
802.3 10BASE-T draft standard. The receive section
transfers 10Mbits/s Manchester-encoded data from the
twisted-pair to the AUI, while the transmit section transfers
data from the AUI cable to the TP wire. The collision-
detection function sends a 10MHz square wave onto the
AUI_CI circuits after sensing data being simultaneously
transmitted and received.
In addition to the these functions, there are three optional
operating functions. Enabling the link-integrity function
causes a pulse to be transmitted in the absence of data
transmission. The Receiver recognized link-integrity
pulses and connects the twisted-pair link. The link-
integrity pin can be configured as an input or as an output.
When the link-integrity pin is configured as an input, the
function is enabled for proper setting. When the link-
integrity pin is configured as an output, the function is
enabled and the status of the link is indicated.
If the heartbeat function is enabled, it allows the SQE-test
sequence to be transmitted to the DTE after every
successful transmission on the TP wire. The option also
DM9095
Twisted-Pair Medium Attachment Unit
enables normal or extended line length to be selected.
When standard TP squelch levels are implemented,
normal line length is used. When the TP squelch
thresholds are lowered, extended line length is used.
The device also contains an auto-polarity function which
can be determined if the receive twisted-pair has been
wired with polarity reversal. If the twisted-pair is wired
with polarity reversal, the device automatically corrects for
this error condition. Also, the auto-polarity function can
be used with an LED to display the polarity of the receive
twisted-pair wire.
When power-down mode is set, the device shuts down,
and the supply current is reduced to less than 10µA. The
DM9095 automatically pulls AUI-DI, AUI_CI, and AUI-DO
into high impedance state if the twisted-pair link is not
connected. The function is used to provide the
Encoder/Decoder chip to use coaxial MAU. The
DM9095 also includes four drivers capable of driving four
LEDs to indicate the status of the receive, transmit,
collision, and jabber functions. Also, when configured
correctly, two additional LEDs can display auto-polarity
and link-integrity status.
5
Final
Version: DM9095-DS-F02
August 21, 2000
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