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DM9095 Datasheet(PDF) 5 Page - List of Unclassifed Manufacturers |
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DM9095 Datasheet(HTML) 5 Page - List of Unclassifed Manufacturers |
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5 / 21 page  DM9095 Twisted-Pair Medium Attachment Unit 5 Final Version: DM9095-DS-F02 August 21, 2000 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 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 10 µA. 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. |
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