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AM79C985 データシート(PDF) 1 Page - Advanced Micro Devices |
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AM79C985 データシート(HTML) 1 Page - Advanced Micro Devices |
1 / 48 page PRELIMINARY This document contains information on a product under development at Advanced Micro Devices. The information is intended to help you evaluate this product. AMD reserves the right to change or discontinue work on this proposed product without notice. Publication# 20651 Rev: B Amendment/0 Issue Date: January 1998 Am79C985 enhanced Integrated Multiport Repeater Plus (eIMR+™) DISTINCTIVE CHARACTERISTICS s Repeater functions compliant with IEEE 802.3 Repeater Unit specifications s Direct interface with the Am79C987 Hardware Implemented Management Information Base (HIMIB™) device for building a basic managed multiport repeater s Full software backwards compatibility with existing hub designs using Integrated Multiport Repeater Plus (IMR+™)/HIMIB devices s Network management and optional feature accessibility through a dedicated serial management port s Four integral 10BASE-T transceivers with on- chip filtering eliminating the need for external filter modules on the 10BASE-T transmit-data (TXD) and receive-data (RXD) lines s One Reversible Attachment Unit Interface (RAUI™) port used either as a standard IEEE- compliant AUI port for connection to a Medium Attachment Unit (MAU) or a reversed port for direct connection to a Media Access Controller (MAC) s Low cost suitable for managed multiport repeater designs s Number of repeater ports easily expandable with support for up to seven eIMR+ devices without the need for an external arbiter s All ports capable of being individually isolated (partitioned) in response to excessive collision conditions or fault conditions s Flexible LED support for individual port status and network utilization LEDs s Programmable extended distance mode on RXD lines allowing connection to cables longer than 100 meters s Link Test function and Link Test pulse transmission capable of being disabled through the management port allowing devices that do not implement the Link Test function to work with the eIMR+ device s Programmable automatic polarity detection and correction option permitting automatic recovery from wiring errors s Full amplitude and timing regeneration for retransmitted waveforms s CMOS device with a single +5-V supply GENERAL DESCRIPTION The enhanced Integrated Multiport Repeater Plus (eIMR+) device is a VLSI integrated circuit that pro- vides a system-level solution to designing managed multiport repeaters. The device integrates the repeater functions specified in Section 9 of the IEEE 802.3 standard and Twisted Pair Transceiver functions com- plying with the 10BASE-T standard. The eIMR+ device provides four Twisted Pair (TP) ports and one reversible AUI (RAUI) port for direct connec- tion to a MAC. The total number of ports per repeater unit can be increased by connecting multiple eIMR+ devices through their expansion ports, hence, minimiz- ing the total cost per repeater port. The eIMR+ device also provides a connection to the Am79C987 HIMIB device. The HIMIB device monitors all the necessary counters, attributes, actions, and notifications specified by IEEE 802.3, Section 19 (Layer Management for 10 Megabit per second (Mbps) Baseband Repeaters). When the eIMR+ and HIMIB devices are used together as a chip set, they provide a cost-effective solution to the problem of designing 10BASE-T basic managed multiport repeaters. The device is fabricated in CMOS technology and requires a single +5-V supply. |
同様の部品番号 - AM79C985 |
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同様の説明 - AM79C985 |
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