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AM79C100 Datasheet(PDF) 1 Page - Advanced Micro Devices |
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AM79C100 Datasheet(HTML) 1 Page - Advanced Micro Devices |
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1 / 24 page  FINAL Publication# 16511 Rev: B Amendment/0 Issue Date: May 1994 1 Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) DISTINCTIVE CHARACTERISTICS s CMOS device provides IEEE 802.3-compliant operation and low operating current from a single +5 V supply s Power Down mode for reduced power consumption in battery-powered applications s Automatic twisted-pair link integrity s Pin-selectable twisted-pair receive polarity detection and automatic inversion of the receive signal. Polarity indication output pin can directly drive an LED. s Pin-selectable twisted-pair link integrity test capability conforming to the IEEE 802.3 standard. Link status pin can directly drive an LED. s Transmit, receive, and collision status indications available on separate, dedicated pins s Outputs can directly drive LEDs with pulses stretched to ensure LED visibility s Internal twisted-pair transmitter digital predistortion circuit to reduce medium-induced jitter s Pin-selectable SQE Test (heartbeat) enable s AUI loopback, Jabber Control, and SQE Test functions comply with the 10BASE-T standard s User-selectable loopback operations s Pin-selectable twisted-pair receive threshold programming for extended distance line lengths GENERAL DESCRIPTION The Am79C100 Twisted-Pair Ethernet Transceiver Plus (TPEX Plus) is an integrated circuit that implements the medium attachment unit (MAU) functions for the twisted-pair medium, as specified by the supplement to the IEEE 802.3 standard (Type 10BASE-T). This de- vice provides the necessary electrical and functional interface between the IEEE 802.3 standard attachment unit interface (AUI) and the twisted-pair cable. A network based on the 10BASE-T standard can use unshielded twisted-pair cables, providing an economi- cal solution to networking by allowing the use of existing telephone wiring. The Am79C100 provides a minimal component count and a cost-effective solution to the design and implementation of 10BASE-T standard networks. TPEX Plus provides twisted-pair driver and receiver cir- cuits, including on-board transmit digital predistortion, receiver squelch, and an AUI port with pin-selectable SQE Test enable. The device provides a number of ad- ditional features, including Link Status indication with automatic twisted-pair receive polarity detection/ correction and indication; pin-selectable receive threshold programming for extended distance line lengths; and Receive Carrier Sense, Transmit Active and Collision Present indications. The device provides separate twisted-pair Link Status, Polarity Status, Receive, Transmit, and Collision outputs to drive LEDs directly. |
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