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AM79C961AKC Folha de dados(PDF) 2 Page - Advanced Micro Devices |
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AM79C961AKC Folha de dados(HTML) 2 Page - Advanced Micro Devices |
2 / 206 page 2 Am79C961A GENERAL DESCRIPTION The PCnet-ISA II controller, a single-chip Ethernet con- troller, is a highly integrated system solution for the PC-AT Industry Standard Architecture (ISA) architec- ture. It is designed to provide flexibility and compatibil- ity with any existing PC application. This highly integrated VLSI device is specifically designed to re- duce parts count and cost, and addresses applications where higher system throughput is desired. The PC- net-ISA II controller is fabricated with AMD’s advanced low-power CMOS process to provide low standby cur- rent for power sensitive applications. The PCnet-ISA II controller can be configured into one of three different architecture modes to suit a particular PC application. In the Bus Master mode, all transfers are performed using the integrated DMA controller. This configuration enhances system performance by allowing the PCnet-ISA II controller to bypass the plat- form DMA controller and directly address the full 24-bit memory space. The implementation of Bus Master mode allows minimum parts count for the majority of PC applications. The PCnet-ISA II can also be config- ured as a Bus Slave with either a Shared Memory or Programmed I/O architecture for compatibility with low-end machines, such as PC/XTs that do not support Bus Masters, and high-end machines that require local packet buffering for increased system latency. The PCnet-ISA II controller is designed to directly inter- face with the ISA or EISA system bus. It contains an ISA Plug and Play bus interface unit, DMA Buffer Man- agement Unit, 802.3 Media Access Control function, individual 136-byte transmit and 128-byte receive FIFOs, IEEE 802.3 defined Attachment Unit Interface (AUI), and a Twisted Pair Transceiver Media Attach- ment Unit. Full duplex network operation can be enabled on any of the device’s network ports. The PC- net-ISA II controller is also register compatible with the LANCE (Am7990) Ethernet controller and PCnet-ISA (Am79C960). The DMA Buffer Management Unit sup- ports the LANCE descriptor software model. External remote boot and Ethernet physical address PROMs and Electrically Erasable Proms are also supported. This advanced Ethernet controller has the built-in capability of automatically selecting either the AUI port or the Twisted Pair transceiver. Only one interface is active at any one time. The individual 136-byte transmit and 128-byte receive FIFOs optimize system over- head, providing sufficient latency during packet trans- mission and reception, and minimizing intervention during normal network error recovery. The integrated Manchester encoder/decoder eliminates the need for an external Serial Interface Adapter (SIA) in the node system. If support for an external encoding/decoding scheme is desired, the embedded General Purpose Serial Interface (GPSI) allows direct access to/from the MAC. In addition, the device provides programmable on-chip LED drivers for transmit, receive, collision, receive polarity, link integrity and activity, or jabber status. The PCnet-ISA II controller also provides an External Address Detection InterfaceTM (EADITM) to allow external hardware address filtering in internet- working applications. For power sensitive applications where low stand-by current is desired, the device incorporates a sleep function to reduce over-all system power consumption, excellent for notebooks and Green PCs. In conjunction with this low power mode, the PCnet-ISA II controller also has integrated functions to support Magic Packet, an inexpensive technology that allows remote wake up of Green PCs. With the rise of embedded networking applications operating in harsh environments where temperatures may exceed the normal commercial temperature (0 °C to +70 °C) window, an industrial temperature (–40°C to +85 °C) version is available in all two packages; 132-pin PQFP and 144-pin TQFP. The industrial temperature version of the PCnet-ISA II Ethernet controller is characterized across the industrial temperature range (–40 °C to +85°C) within the published power supply specification (4.75 V to 5.25 V; i.e., ±5% V CC). |
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Descrição semelhante - AM79C961AKC |
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