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AM79C940 Datasheet(PDF) 2 Page - Advanced Micro Devices |
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AM79C940 Datasheet(HTML) 2 Page - Advanced Micro Devices |
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2 / 144 page  2 Am79C940 The MACE device provides a complete Ethernet node solution with an integrated 10BASE-T transceiver, and supports up to 25-MHz system clocks. The MACE device embodies the Media Access Control (MAC) and Physical Signaling (PLS) sub-layers of the IEEE 802.3 standard, and provides an IEEE defined Attach- ment Unit Interface (AUI) for coupling to an external Medium Attachment Unit (MAU). The MACE device is compliant with 10BASE2, 10BASE5, 10BASE-T, and 10BASE-F transceivers. Additional features also enhance over-all system design. The individual transmit and receive FIFOs optimize system overhead, providing substantial latency during packet transmission 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 General Purpose Serial Interface (GPSI) allows direct access to/from the MAC. In addition, the Digital Attach- ment Interface (DAI), which is a simplified electrical attachment specification, allows implementation of MAUs that do not require DC isolation between the MAU and DTE. The DAI port can also be used to indicate transmit, receive, or collision status by connecting LEDs to the port. The MACE device also provides an External Address Detection Interface (EADI) to allow external hardware address filtering in internet working applications. The Am79C940 MACE chip is offered in a Plastic Leadless Chip Carrier (84-pin PLCC), a Plastic Quad Flat Package (100-pin PQFP), and a Thin Quad Flat Package (TQFP 80-pin). There are several small func- tional and physical differences between the 80-pin TQFP and the 84-pin PLCC and 100-pin PQFP config- urations. Because of the smaller number of pins in the TQFP configuration versus the PLCC configuration, four pins are not bonded out. Though the die is identical in all three package configurations, the removal of these four pins does cause some functionality differ- ences between the TQFP and the PLCC and PQFP configurations. Depending on the application, the removal of these pins will or will not have an effect. (See section: “Pins Removed for TQFP Package and Their Effects.) With the rise of embedded networking applications op- erating 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 three packages; 84- pin PLCC, 100-pin PQFP and 80-pin TQFP. The indus- trial temperature version of the MACE Ethernet control- ler 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). Thus, conformance of MACE performance over this temperature range is guaranteed by the design and characterization monitor. |
Similar Part No. - AM79C940_00 |
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Similar Description - AM79C940_00 |
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