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AM79C989 Dataheets PDF



Part Number AM79C989
Manufacturers Advanced Micro Devices
Logo Advanced Micro Devices
Description Quad Ethernet Switching Transceiver
Datasheet AM79C989 DatasheetAM79C989 Datasheet (PDF)

PRELIMINARY Am79C989 Quad Ethernet Switching Transceiver (QuEST™) DISTINCTIVE CHARACTERISTICS s Four independent 10BASE-T transceivers compliant with the IEEE 802.3 standard s Four digital Manchester Encode/Decode (MENDEC) units s On-chip filtering enables FCC EMI compliance without external filters or common mode chokes s Automatic polarity Correction and Detection on 10BASE-T receivers s Optional Attachment Unit Interface (AUI) for non-10BASE-T transceivers s 10BASE-T Extended Distance option a.

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PRELIMINARY Am79C989 Quad Ethernet Switching Transceiver (QuEST™) DISTINCTIVE CHARACTERISTICS s Four independent 10BASE-T transceivers compliant with the IEEE 802.3 standard s Four digital Manchester Encode/Decode (MENDEC) units s On-chip filtering enables FCC EMI compliance without external filters or common mode chokes s Automatic polarity Correction and Detection on 10BASE-T receivers s Optional Attachment Unit Interface (AUI) for non-10BASE-T transceivers s 10BASE-T Extended Distance option accommodate lines longer than 100 meters s Quad AMD Switching Interface (QuASI™) interface reduces overall pin count s Half-Duplex and Full-Duplex operation s Auto-Negotiation compliant with IEEE 802.3u Standard s Standard MII management interface and protocol s Status Change Interrupt output pin for fast response time to changed conditions s 44-pin PLCC CMOS device s 5 V supply with 3.3 V system interface compatibility GENERAL DESCRIPTION The Am79C989 Quad Ethernet Switching Transceiver (QuEST™) is a four-port physical layer (PHY) device that provides all of the analog functions needed for a 10BASE-T switch, including four independent Manchester Encode/Decode units (MENDECs) and four independent 10BASE-T transceivers. If the AUI p o rt i s u s e d fo r a 1 0 B A S E - 2 , 1 0 B A S E - 5 , o r 10BASE-FL transceiver, one of the four 10BASE-T ports is disabled. The QuEST device is designed for 10 Mbps Ethernet switching hubs, port switching repeater hubs, routers, bridges, and servers that require data encoding and clock recovery on a per port basis and are limited by pin constraints. Clock recovery is performed as part of the MENDEC function. The QuEST device supports every physical layer function of a full-featured switch, including full-duplex operation with Auto-Negotiation and the ability to use various media types. A unique feature of the QuEST device is the Quad AMD Switching Interface (QuASI) which multiplexes the data for all four channels into one set of pins. This minimizes the pin count and size of the QuEST device and substantially reduces overall system cost. The QuEST device provides a 2-pin Media Independent Interface (MII) Management Interface which supports the protocols specified in the IEEE 802.3u standard. Controlled by the switch system, this interface allows the QuEST device to be polled for status information and allows operating parameters of the QuEST device, such as extended distance operation, to be altered. The Am79C989 device provides an Interrupt pin to indicate changes in the internal status of the device. The interrupt function reduces CPU polling of status registers and allows fast response time to changes in physical layer conditions. 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# 21173 Rev: B Amendment/+2 Issue Date: April 1997 P R E L I M I N A R Y BLOCK DIAGRAM System Interface Network Interface 10BASE-T Transceiver 0 Jabber Timer QTX_EN Collision Detect Manchester Encoder Line Driver with Wave Shaping TXD0+ TXD0- RXD0+ QTX_DATA Manchester Decode and Carrier Detect Elasticity FIFO QRX_DATA QRX_VALID QuASI Interface 10BASE-T Transceiver 1 Link Detect Link/Auto Neg State Machine Polarity Detection/ Correction Line Receiver with Smart Squelch RXD0- REXT QRX_CRS TXD1+ TXD1RXD1+ RXD1TXD2+ TXD2RXD2+ RXD2TXD3+ TXD3RXD3+ RXD3PCI/CI+ QCLSN 10BASE-T Transceiver 2 10BASE-T Transceiver 3 SCLK Collision Detect AUI Collision Squelch QINT/CI- DO+ QRST/STRB Attachment Unit Interface AUI Receiver with Squelch AUI Transmitter DODI+ DI- Register Block MDC MDIO v3 Management Interface 21173B-1 2 Am79C989 P R E L I M I N A R Y CONNECTION DIAGRAM QRX_VALID QRX_DATA QTX_DATA QRX_CRS QTX_EN QCLSN VDDIO VSSIO SCLK MDIO 6 QRST/STRB REXT VSS QINT/CIPCI/CI+ DIDI+ VSSAUI DODO+ VDDTX 7 8 9 10 11 12 13 14 15 16 17 5 4 3 2 1 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 VDD RXD3+ RXD3RXD2+ RXD2VSSRX RXD1+ RXD1RXD0+ RXD0VDDTX QuEST Am79C989 44 PLCC Version 2.0 18 19 20 21 22 23 24 25 26 27 28 VSSTX VDDTX VSSTX TXD0TXD1TXD+ TXD2TXD0+ TXD2+ TXD3TXD3+ MDC 21173B-2 Am79C989 3 P R E L I M I N A R Y LOGIC DIAGRAM QTX_EN QTX_DATA QRX_DATA QRX_VALID QRX_CRS QCLSN SCLK QRST/STRB MDC MDIO VSS VDDIO VDDTX(3) VDD TXD+ TXDTwisted Pair Ports (4 Ports) RXD+ RXDQINT/CIPCI/CI+ DO+ DODI+ VSSAUI VSSTX(2) VSSRX VSSIO DI- 21173B-3 LOGIC SYMBOL MENDEC TP MENDEC QuASI QuASI Interface TP MENDEC TP TP MENDEC AUI Management Interface 21173B-4 4 Am79C989 P R E L I M I N A R Y RELATED PRODUCTS Part No. Am7990 Am7992B Am7996 Am79C90 Am79C98 Am79C100 Am79C870 Am79C871 Am79C981 Am79C982 Am79C983 Am79C984A Am79C985 Am79C987 Am79C988 Am79C900 Am79C940 Am79C960 Am79C961 Am79C961A Am79C965 Am79C970 Am79C970A Am79C971B Am79C974 Serial Interface Adapter (SIA) IEE.


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