AM79C989JCT

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 PRELIMINARY 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 PRELIMINARY 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 54 32 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 PRELIMINARY 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 PRELIMINARY 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) IEEE 802.3/Ethernet/Cheapernet Transceiver CMOS Local Area Network Controller for Ethernet (C-LANCE) Twisted Pair Ethernet Transceiver (TPEX) Twisted Pair Ethernet Transceiver Plus (TPEX+) Quad Fast Ethernet Transceiver (QFEX™) for 100BASE-X Quad Fast Ethernet Transceiver for 100BASE-X Repeater (QFEXr™) Integrated Multiport Repeater Plus (IMR+™) basic Integrated Multiport Repeater (bIMR™) Integrated Multiport Repeater 2 (IMR2™) enhanced Integrated Multiport Repeater (eIMR™) enhanced Integrated Multiport Repeater Plus (eIMR+™) Hardware Implemented Management Information Base (HIMIB™) Quad Integrated Ethernet Transceiver (QuIET™) Integrated Local Area Communications Controller (ILACC™) Media Access Controller for Ethernet (MACE™) PCnet™-ISA Single-Chip Ethernet Controller (for ISA bus) PCnet™-ISA+ Single-Chip Ethernet Controller for ISA (with Microsoft® Plug n’ Play® Support) PCnet™-ISA II Full Duplex Single-Chip Ethernet Controller for ISA PCnet™-32 Single-Chip 32-Bit Ethernet Controller PCnet™-PCI Single-Chip Ethernet Controller (for PCI bus) PCnet™-PCI II Full Duplex Single-Chip Ethernet Controller (for PCI bus) PCnet™-FAST Single-Chip Full-Duplex 10/100 Mbps Ethernet Controller for PCI Local Bus PCnet™-SCSI Combination Ethernet and SCSI Controller for PCI Systems Description Local Area Network Controller for Ethernet (LANCE) Am79C989 5 PRELIMINARY ORDERING INFORMATION Standard Products AMD standard products are available in several packages and operating ranges. The order number (Valid Combination) is formed by a combination of the elements below. Am79C989 J C ALTERNATE PACKAGING OPTION \T = Tape and reel TEMPERATURE RANGE C = Commercial (0˚C to +70˚C) PACKAGE TYPE J = 44 PLCC SPEED OPTION Not Applicable DEVICE NUMBER/DESCRIPTION Am79C989 Quad Ethernet Switching Transceiver (QuEST) Valid Combinations Am79C989 JC or JC\T Valid Combinations Valid Combinations list configurations planned to be supported in volume for this device. Consult the local AMD sales office to confirm availability of specific valid combinations and to check on newly released combinations. 6 Am79C989 PRELIMINARY TABLE OF CONTENTS DISTINCTIVE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 GENERAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 LOGIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 LOGIC SYMBOL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 RELATED PRODUCTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Standard Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 PIN DESIGNATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Listed by Pin Number. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Listed by Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PIN DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 10BASE-T Signal Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 AUI Signal Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 QuASI Interface Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Management Interface Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Miscellaneous Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Power Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 FUNCTIONAL DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 10BASE-T Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 10BASE-T Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Jabber Condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 10BASE-T Receiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Differential Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Receive Polarity Correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14 Extended Distance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Collision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Link Integrity with Auto-Negotiation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 10BASE-T Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Auto-Negotiation Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Manchester Encoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Manchester Decoder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Elasticity FIFO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Attachment Unit Interface (AUI) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 AUI Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 AUI Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Collision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 QuASI Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Management Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 The Management Frame . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 PHY Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Interrupt Function. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3.3 Volt Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 REGISTER DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Shared Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Port Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Non-Implemented Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Auto-Negotiation Control Register (Reg 0) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Auto-Negotiation Status Register (Reg 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Auto-Negotiation Advertisement Register (Reg 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Auto-Negotiation Link Partner Ability Register (Reg 5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 Am79C989 7 PRELIMINARY Auto-Negotiation Next Page Register (Reg 7). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Error Mask Register (Reg 20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 SYSTEM APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 10 Mbps Ethernet Switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 OPERATING RANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Commercial (C) Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 DC CHARACTERISTICS OVER OPERATING RANGES UNLESS OTHERWISE SPECIFIED. . . . 29 KEY TO SWITCHING WAVEFORMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 PHYSICAL DIMENSIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37 8 Am79C989 PRELIMINARY PIN DESIGNATIONS Listed by Pin Number Pin No. 1 2 3 4 5 6 7 8 9 10 11 Pin Name VDDIO QRX_DATA QRX_VALID QTX_DATA QTX_EN SCLK QRST/STRB REXT VSS QINT/CIPCI/CI+ Pin No. 12 13 14 15 16 17 18 19 20 21 22 Pin Name DIDI+ VSSAUI DODO+ VDDTX TXD0TXD0+ VSSTX TXD1TXD1+ Pin No. 23 24 25 26 27 28 29 30 31 32 33 Pin Name VDDTX TXD2TXD2+ VSSTX TXD3TXD3+ VDDTX RXD0RXD0+ RXD1RXD1+ Pin No. 34 35 36 37 38 39 40 41 42 43 44 Pin Name VSSRX RXD2RXD2+ RXD3RXD3+ VDD MDC MDIO QCLSN QRX_CRS VSSIO Listed by Group Pin Number 10BASE-T Signal Pins 19 & 18 22 & 21 25 & 24 28 & 27 31 & 30 33 & 32 36 & 35 38 & 37 AUI Signal Pins 10 11 13 & 12 16 & 15 QuASI Interface 2 QRX_DATA I/O Multiplexed serial receive data PHYAD 4 internal address input upon reset Multiplexed receive data valid enable PHYAD 3 internal address input upon reset Multiplexed serial transmit data Multiplexed transmit enable QINT/CIPCI/CI+ DI± DO± I/O Input Input Output AUI differential collision receiver negative signal or Interrupt output signal (open drain) AUI differential collision receiver positive signal or single-ended Pseudo AUI receiver Attachment Unit Interface differential data receiver Attachment Unit Interface differential output driver TXD0± TXD1± TXD2± TXD3± RXD0± RXD1± RXD2± RXD3± Output Output Output Output Input Input Input Input Port 0 10BASE-T differential driver Port 1 10BASE-T differential driver Port 2 10BASE-T differential driver Port 3 10BASE-T differential driver Port 0 10BASE-T differential receiver Port 1 10BASE-T differential receiver Port 2 10BASE-T differential receiver Port 3 10BASE-T differential receiver Pin Name Pin Type Pin Description 3 4 5 QRX_VALID QTX_DATA QTX_EN I/O Input Input Am79C989 9 PRELIMINARY Pin Number Pin Name Pin Type Pin Description QuASI Interface (Continued) 42 43 Management Interface 40 41 Miscellaneous Pins 6 7 8 Power Pins 1 44 39 9 14 29, 23, 17 26, 20 34 VDDIO VSSIO VDD VSS VSSAUI VDDTX VSSTX VSSRX VDD1 VSS VDD VSS VSS VDD VSS VSS 1 VDD pin for digital Outputs (3.3 Volt Capable) 1 VSS pin for digital Inputs/Outputs 1 VDD pin for internal digital logic 1 VSS pin for internal digital logic 1 Analog VSS pin for AUI circuit 3 Analog VDD pins for TXD driver 2 Analog VSS pins for TXD driver 1 Analog VSS pin for 10BASE-T Receivers SCLK QRST/STRB REXT Input Input Input System Clock for QuASI Interface Active Low -- Reset and QuASI Channel 0 strobe External resistor for determining TXD drive levels MDC MDIO Input I/O Management Interface Clock Management Interface Data QCLSN QRX_CRS I/O Output Multiplexed collision error PHYAD 2 internal address input upon reset Multiplexed receive carrier sense PIN DESCRIPTIONS 10BASE-T Signal Pins TXD0± 10BASE-T Transmit Data Port 0 Output TXD0± are the 10BASE-T differential data drivers for port 0. RXD0± 10BASE-T Receive Data Port 0 Input RXD0± are the 10BASE-T differential data receivers for port 0. TXD1± 10BASE-T Transmit Data Port 1 Output TXD1± are the 10BASE-T differential data drivers for port 1. RXD± 10BASE-T Receive Data Port 1 Input RXD1± are the 10BASE-T differential data receivers for port 1. TXD2± 10BASE-T Transmit Data Port 2 Output TXD2± are the 10BASE-T differential data drivers for port 2. RXD2± 10BASE-T Receive Data Port 2 Input RXD2± are the 10BASE-T differential data receivers for port 2. TXD3± 10BASE-T Transmit Data Port 3 Output TXD3± are the 10BASE-T differential data drivers for port 3. 10 Am79C989 PRELIMINARY RXD3± 10BASE-T Receive Data Port 3 Input RXD3± are the 10BASE-T differential data receivers for port 3. QuASI Interface QTX_EN Multiplexed Transmit Enable Input QTX_EN indicates to QuEST that valid transmit data is on QTX_DATA. QTX_EN for all 4 ports is time-division multiplexed onto this signal and is sampled with respect to SCLK. The channel’s slot is synchronized to the rising edge of QRST/STRB. QTX_DATA Multiplexed Transmit Data Input Q TX_DATA indicates serial NRZ transmit data. QTX_DATA for all 4 ports is time-division multiplexed onto this signal and is sampled with respect to SCLK. The channel’s slot is synchronized to the rising edge of QRST/STRB. QRX_CRS Multiplexed Receive Carrier Sense Output QRX_CRS indicates receive or transmit activity on the network. QRX_CRS for all 4 ports is time-division multiplexed onto this signal and is sampled with respect to SCLK. The channel’s slot is synchronized to the rising edge of QRST/STRB. QRX_VALID Multiplexed Receive Data Valid Output QRX_VALID indicates that valid receive data is on QRX_DATA. QRX_VALID for all 4 ports is time-division multiplexed onto this signal and is sampled with respect to SCLK. The channel’s slot is synchronized to the rising edge of QRST/STRB. At the rising edge of reset, QRX_VALID is sampled to determine PHYAD 3. QRX_DATA Multiplexed Receive Data Output Q RX_DATA indicates serial NRZ receive data. QRX_DATA for all 4 ports is time-division multiplexed onto this signal and is sampled with respect to SCLK. The channel’s slot is synchronized to the rising edge of QRST/STRB. At the rising edge of reset, QRX_DATA is sampled to determine PHYAD 4. QCLSN Multiplexed Collision Output QCLSN indicates a collision condition on the network. QCLSN for all 4 ports is time-division multiplexed onto this signal and is sampled with respect to SCLK. The channel’s slot is synchronized to the rising edge of QRST/STRB. At the rising edge of reset, QCLSN is sampled to determine PHYAD 2. AUI Signal Pins DO± AUI Data Out Output When Port 0 is configured for AUI, DO± are the AUI differential data out drivers. Data is transmitted with Manchester encoded signaling compliant with IEEE 802.3 standards. DI± AUI Data In Input When Port 0 is configured for AUI (Control Register Reg 18 bit 2), DI± are the AUI differential data in receivers. Data is indicated by Manchester encoded signaling compliant with IEEE 802.3 standards. PCI/CI+ Pseudo-AUI Collision, AUI Collision Int (-) Input/Input When Interrupt Enable is true (Control Register Reg 18 bit 5) and port 0 is configured for AUI (Control Register Reg 18 bit 2), this pin is configured as PCI. PCI is a single-ended pseudo-AUI collision in signal. Collision is indicated by a 10 MHz pattern. When Interrupt Enable is false (Control Register Reg 18 bit 5) and port 0 is configured for AUI (Control Register Reg 18 bit 2), this pin is configured as CI+. CI± are the AUI differential collision in signals. Collision is indicated by a 10 MHz pattern compliant with IEEE 802.3 standards. QINT/CIQuEST Interrupt, AUI Collision Int (-) Output/Input When Interrupt Enable is true (Control Register Reg. 18 bit 5), this pin is configured as QINT. QINT is an active-low signal which indicates that one of the following conditions has occurred: Link Status Change, Duplex Mode Change, Auto-Negotiation Change, MAU Error. Interrupt status flags and enables for individual conditions are reported in the Interrupt Status and Enable Register (Reg 16). When Interrupt Enable is false (Control Register Reg 18 bit 5) and port 0 is configured for AUI (Control Register Reg 18 bit 2), this pin is configured as CI-. CI± are the AUI differential collision in signals. Collision is indicated by a 10-MHz pattern compliant with IEEE 802.3 standards. Am79C989 11 PRELIMINARY Management Interface MDC Management Data Clock Input MDC provides the timing reference for data on the MDIO pin. The Management Interface provides read and write access to QuEST registers, similar to the MII management interface of the IEEE 802.3u standard. MDIO Management Data I/O Input/Output MDIO is a bidirectional data signal between QuEST and a management entity. MDIO timing is referenced to MDC. The Management Interface provides read and write access to QuEST registers, similar to the MII management interface of the IEEE 802.3u standard. VSS Digital Ground Power There is a single ground pin that is used for internal digital circuitry. The VSS pin must be connected to ground. VDDIO Digital I/O Power Power There is a single power supply pin that is used for digital I/O pins. The VDDIO pin can be connected to either a +5 V or a +3.3 V supply. VSSIO Digital I/O Ground Power There is a single ground pin that is used for digital I/O pins. The VSSIO pin must be connected to ground. VDDTX Analog 10BASE-T Power Power There are three power supply pins that are used for analog 10BASE-T transmit pins. The VDDTX pins must be connected to a +5 V supply. VSSTX Analog 10BASE-T Ground Power There are two ground pins that are used for analog 10BASE-T transmit pins. The VSSTX pins must be connected to ground. VSSRX Analog 10BASE-T Ground Power There is a single ground pin that is used for analog 10BASE-T receive pins. The VSSRX pin must be connected to ground. VSSAUI Analog I/O Ground Power There is a single ground pin that is used for analog AUI circuitry. The VSSAUI pin must be connected to ground. Miscellaneous Pins SCLK System Clock Input SLCK is a 40-MHz (100 ppm) clock used for timing the 10BASE-T ports, the (optional) AUI port, the QuASI interface and core logic. REXT External Resistor Input REXT should be pulled to analog VDD via a 13 K Ω (1% tolerance) external resistor. This signal is used to determine the 10BASE-T transmit current reference. QRST/STRB QuEST Reset and Channel 0 Strobe Input Q RST/STRB i s an active-low signal that will reset QuEST if asserted for at least 1µs. QRST/STRB also forces the channel slots of the QuASI interface to be continuous aligned if strobed for a single clock period. Power Pins VDD Digital Power Power There is a single power supply pin that is used for internal digital circuitry. The VDD pin must be connected to a +5 V supply. 12 Am79C989 PRELIMINARY FUNCTIONAL DESCRIPTION Overview The QuEST device is a highly integrated physical layer solution for twisted pair 10-Mbps Ethernet applications. There are three main sets of interfaces to the QuEST. On the network side, there are the 10BASE-T transmit and receive interfaces and one Attachment Unit Interface (AUI). On the system side, there are the QuASI Interface and the Management Interface. The QuEST device supports four independent ports, each consisting of a 10BASE-T transceiver with on-chip filtering and a Manchester encode/decode unit. The QuEST device incorporates transmit drivers which shape the Manchester waveform and facilitate filterless operation. The QuEST device provides the option of implementing an AUI suitable for coaxial and fiber MAUs. When the AUI is used, 10BASE-T port 0 is disabled. Ports 1, 2, and 3 remain for 10BASE-T use. Each 10BASE-T channel is composed of these main circuits: 10BASE-T driver, 10BASE-T receiver, Link Integrity with Auto-Negotiation, Manchester Encoding, Manchester Decoding, and Elasticity FIFO. Shared circuits are the following: the QuASI Interface and the Management Interface with Configuration and Status Registers. The QuEST device supports Auto-Negotiation as defined by the IEEE 802.3u standard. If the two pieces of networking equipment at each end of a physical link are both capable of Auto-Negotiation, they can exchange information about their respective capabilities and potentially agree to move to a different mode of operation. In the case of the QuEST device, the primary capability it can advertise is full-duplex operation, offering the potential of a 20-Mbps link instead of 10 Mbps. The QuEST device also supports “Next Page,” offering the flexibility to add new features in the future. The QuASI is a unique feature of the QuEST device. This serial interface multiplexes the data for all four serial channels onto one set of pins similar to AMD’s General Purpose Serial Interface (GPSI). This interface runs at 40 MHz, providing a data rate for these pins four times faster than a standard 10-Mbps serial interface. This approach reduces the pin count and size of the QuEST device, as well as substantially reducing the number of pins needed to interface the QuEST device to the switching device. The QuEST device has a 2-pin Management Interface, controlled by the system switch, which allows the QuEST device to be polled for status information. This interface supports the MII protocols specified in the IEEE 802.3u standard. Of the two pins, MDC is the management clock and MDIO is the bidirectional data and control signal. To further optimize operation, the QuEST device has been designed so that an interrupt mode can be selected to reduce delay associated with polling the status registers. The QuEST device is designed to easily and reliably interface to systems using either 3.3 V or 5 V supplies. This is accomplished by having a separate power supply pin, VDDIO, which can be connected to either a 3.3 V or a 5 V supply. The digital interface pins of the QuASI interface and the Management Interface are the only pins affected by the choice of supply. 10BASE-T Interface The 10BASE-T interface section is composed of several circuits and logic blocks: 10BASE-T transmitter, 10BASE-T receiver, Collision, and Link Integrity with Auto-Negotiation. The QuEST device contains four identical 10BASE-T circuits. 10BASE-T Transmitter The 10BASE-T transmitter is composed of several important sub circuits. The major function of the 10BASET driver is to impart an analog waveform in Manchester format which adheres to the IEEE 802.3i 10BASE-T specification. The transmitter consists of a 10BASE-T driver with on-chip filtering, Jabber timer, and provisions to generate Link pulses for Link Integrity and Auto-Negotiation functions. Driver The QuEST device incorporates a waveform driver, eliminating the need for off-chip filters. The driver circuit requires a 5 V supply. The 10BASE-T driver circuit shapes the analog waveform in a pre-distorted manner, emulating the effect of an external filter. The transmitter requires a 110-Ω (1% tolerance) resistor connected in parallel with the TXD pins. The waveform generated is compliant with the IEEE 802.3i Ethernet specification. During idle periods, 10BASE-T driver pins float to a high impedance state at mid-supply voltage. During idle periods, power consumption is minimized. Jabber Condition The 10BASE-T transmit circuit includes a Jabber timer which prevents the transmission of an excessively long frame. The Jabber condition is invoked when a frame longer than 30 ms is transmitted from the QuASI interface to the 10BASE-T driver. When the Jabber condition is invoked, the transmit enable must be held inactive for approximately 0.5 seconds to allow the Jabber condition to reset. The Jabber timer provides a simple method to protect the network from excessively long frames. When the Jabber condition is invoked, the Collision indication will be asserted if the Link Integrity state machine is in the pass state. Am79C989 13 PRELIMINARY 10BASE-T Receiver The 10BASE-T interface section includes a compliant 10BASE-T receiver which incorporates a low pass filter eliminating the requirement for off-chip filters. The receiver circuit employs squelch circuits programmable to a standard distance of 100 meters and an extended distance mode for distances greater than 100 meters. The squelch circuit requires that the differential receive data on RXD± exceed the squelch levels on both negative and positive pulses and occur in a consecutive negative, positive, negative sequence. There are restrictions on the frequency and pulse width duration. If all conditions are met, the receiver will transition to the unsquelch state, which indicates that a 10BASE-T carrier is detected. If either the voltage levels drop below a defined minimum or the frequency of the incoming waveform drops below a set minimum, the squelch circuit will indicate that the carrier is no longer present. When the carrier is dropped, the squelch circuit will return to the squelched state. In order for an incoming Ethernet frame to be received on the 10BASE-T receive pair, the frame must first pass the receive squelch levels. The received Manchester data is then forwarded to the Manchester decoder. The Manchester decoder extracts the clock and receive data from the Manchester data stream and forwards the data to the elasticity FIFO. The sole purpose of the elasticity FIFO is to rate match the receive data to the synchronous system clock, SCLK. The data which is output from the elasticity FIFOs is combined in the serial multiplexer logic and output in a serially multiplexed format through the QuASI Interface. In addition to detecting a 10BASE-T carrier, the receiver detects valid link pulses. Valid link pulses must pass the squelch level amplitude, but must not be too short or too long in duration. If link pulses are detected, this information is passed to the Link Integrity and AutoNegotiation logic. Once in the unsquelched state, the receiver amplifies the differential signal to full CMOS levels for Manchester clock and data extraction. polarity of the received signal is reversed, (e.g., wiring error in cable). The polarity correction can be disabled by setting Bit 3 of the Control Register (Reg 18). The polarity detection function is activated following Reset or Link Fail and will reverse the receive polarity based on both link pulses and subsequent received frames with a valid End of Transmit Delimiter (ETD). When in the Link Fail State, the QuEST device will recognize link test pulses of either positive or negative polarity. Exit from the Link Fail state is caused by the reception of five consecutive link pulses of identical polarity. The polarity of both the link pulses and the ETD character of valid frames are used to determine the initial receive polarity. Once two consecutive frames are received with the same polarity, the polarity function is locked until a reset or link failure occurs. Extended Distance The receive squelch thresholds can be programmed to 60 percent of the normal level to allow reception of valid 10BASE-T receive frames over distances longer than 100 meters of cable. Normal operation (default) of the QuEST device is set to standard 10BASE-T thresholds. Extended distance mode is programmed by setting Control Register (Reg. 18, bit 1). Collision When a valid receive frame is detected by unsquelching the input receiver and there is simultaneous activity of the TXD± pairs, a collision is detected and indicated at the QuASI interface by assertion of the QCLSN signal during the appropriate channel slot time. The QCLSN signal can be asserted for two other conditions. If the SQE_TEST disable bit, Control Register (Reg. 18, bit 0) is de-asserted, the QCLSN signal will be asserted just after transmission of a valid frame during the SQE window. If the 10BASE-T transmitter is in the Jabber state, the QCLSN signal will be asserted during the channel slot time if the QTX_EN enable signal is asserted for that channel. When the QuEST device is in full duplex mode, no collision events are indicated. Differential Receiver The differential receiver accepts data in differential format. The receiver has internal filtering and does not require external filters. The RXD receive pair require a 100-Ω (1% tolerance) termination resistor across their inputs. The RXD inputs are internally biased to approximately 3 V. When properly terminated, the RXD ports will satisfy the electrical requirements for 10BASE-T receivers in the EEE 802.3i standard. Link Integrity with Auto-Negotiation General The QuEST device can be configured to support either the standard 10BASE-T link integrity algorithm as specified in the IEEE 802.3i Standard or the Auto-Negotiation algorithm as specified in the IEEE 802.3u standard. Auto-Negotiation allows the device to automatically negotiate to full duplex operation if the remote device at the end of the cable supports full duplex operation. Remote Fault and Next Page are also supported. If the remote device does not support AutoNegotiation, the algorithm defaults to the standard 10BASE-T algorithm. Receive Polarity Correction The receive function includes the ability to invert the polarity of the signals appearing at the RXD± pair if the 14 Am79C989 PRELIMINARY The QuEST can be manually configured to support either half-duplex or full-duplex operation. The QuEST device can operate with any remote 10BASE-T standard device or like devices that support the AutoNegotiation algorithm, including 10/100 Mbps devices. half- or full-duplex state. The result of the Auto-Negotiation can be read from the status register for the port of interest. After conclusion of the Auto-Negotiation process, the QuEST device reverts back to the standard 10BASE-T link integrity algorithm (i.e., transmission of standard link pulses). The QuEST device also supports “Next Page,” offering the flexibility to add new features in the future. Manchester Encoder The QuEST device provides separate Manchester encode circuits per transmit channel. The QuEST device converts the Non-Return to Zero (NRZ) data received after separating the data from the QuASI interface. The Manchester encoding process complements the first half of the data bit. During the second half of the data bit, the true value is sent. Manchester encoding always guarantees a transition at the Bit Cell Center (BCC). Transmission and encoding occur only when the QTX_EN line is asserted during the appropriate time slot. Manchester Decoder The QuEST device provides separate Manchester decode circuits per receive channel. The Manchester Decoder allows for extracting the clock and NRZ data from the received Manchester data stream. After the appropriate receive squelch paths have opened, the Manchester decoder locks onto an incoming frame within two bit times. The Manchester decoder incorporates a fast locking acquisition circuit during the beginning of preamble. The Manchester decode circuit discards approximately 3 bits of data during the data acquisition phase. The maximum jitter tolerated is 13.5 ns on the 10BASE-T ports and 18 ns on the AUI port. Manchester data which is decoded by the unit is sent to the elasticity FIFO for rate decoupling. Elasticity FIFO T he QuEST device incorporates a 10-bit elasticity FIFO. The purpose of the elasticity FIFO is to rate match the frequency of the incoming receive data to the rate of the System Clock (SCLK). 10BASE-T Algorithm T h e Q u E S T d ev i c e i m p l e m e n t s t h e s t a n d a r d 10BASE-T algorithm as defined in the IEEE 802.3 specification. The 10BASE-T algorithm uses Normal Link Pulses (NLP) to establish link integrity. In the standard 10BASE-T algorithm, link pulses are transmitted approximately every 16 ms ±8 ms in the absence of transmitted data. Upon reception of five consecutive link pulses with constant polarity within the specified minimum and maximum times, the QuEST device will detect the presence of a valid link. Reception of a valid receive frame will transition the QuEST device to the link pass state in the absence of link pulses. Auto-Negotiation Algorithm The Auto-Negotiation function determines the abilities of two networking devices at each end of a physical link, if both devices are capable of Auto-Negotiation. After exchanging abilities, the QuEST device and remote link partner device acknowledge each other and choose which advertised abilities to support. The AutoNegotiation function of the QuEST chip facilitates an ordered resolution between exchanged abilities. This exchange allows the devices at either end of the link to take maximum advantage of their respective shared abilities. In the case of the QuEST device, the primary capability it can advertise is full-duplex operation, offering the potential of a 20-Mbps link instead of 10 Mbps in half-duplex mode. The QuEST device implements the transmit and receive Auto-Negotiation algorithm as defined in IEEE 802.3u standard. The Auto-Negotiation algorithm uses a burst of link pulses called Fast Link Pulses (FLPs). The burst of link pulses are spaced between 55 and 140 µs so as to be ignored by the standard 10BASE-T algorithm. The FLP burst conveys information about the abilities of the sending device. The receiver can accept and decode an FLP burst to learn the abilities of the sending device. The link pulses transmitted conform to the standard 10BASE-T template. The QuEST device uses the Auto-Negotiation algorithm to advertise either full- or half-duplex capabilities. The QuEST device can be programmed to force either half- or full-duplex, or to auto-negotiate between halfand full-duplex operation. The Auto-Negotiation algorithm is initiated when one of the following events occurs: Reset, Auto-Negotiation reset, transition to link fail state, or the Auto-Negotiation enable bit is set. After the Auto-Negotiation algorithm is completed, the device will be in either a Attachment Unit Interface (AUI) General The QuEST device provides an optional AUI that can be allocated to port 0 of the four ports. The AUI allows a non-10BASE-T MAU (i.e., 10BASE-2, 10BASE-5, or 10BASE-FL transceiver) to connect to port 0. When the AUI interface is selected for port 0, the 10BASE-T circuit on that interface is disabled. If the 10BASE-T circuit is disabled, the 10BASE-T circuit will terminate the transmission and reception of link pulses as well as frame data. The AUI port will use the Manchester encoder/decoder circuitry of that port. Am79C989 15 PRELIMINARY Either five or six signal pins are used for the AUI function: DO±, DI±, PCI/CI+; and, if Interrupt is disabled, QINT/CI-. AUI Transmitter The AUI circuit provides a differential transmit circuit which operates at Pseudo Emitter Coupled Logic (PECL) levels. The DO± circuit provides an internal termination resistor of 80.4 Ω. When the AUI port is disabled, the DO driver circuit will idle at zero differential voltage with an impedance of 80.4 Ω. AUI Receiver The AUI receive circuit consists of a PECL receiver circuit. It is recommended that DI± inputs be terminated differentially with two 40.2 Ω resistors with the middle node connected to a 0.1 to 0.01 µF by-pass capacitor to analog ground. In order for the AUI to unsquelch, the differential receive data must exceed requirements for both negative amplitude and time duration. Once unsquelched, the receive data is sent to the Manchester decode unit for clock recovery and data extraction. data. The clock input, SCLK, is nominally a 40-MHz signal. This clock input should have a frequency tolerance to 100 ppm. The QuEST internally divides the 40-MHz SCLK input into four clock phases or slots. (Refer to QuASI interface diagram in the Switching Characteristics section.) When the QRST/STRB signal is de-asserted, the internal divide circuit is locked into a repeatable sequence. The first rising edge of the SCLK input after the de-assertion of QRST/STRB results in the input signals, QTX_EN and QTX_DATA, being locked to channel 0. To transmit data for the first channel 0 slot, the transmit data and transmit enable signal must meet the setup and hold times associated with the first rising edge of SCLK after QRST/STRB is driven inactive. The repetitive channel order for transmitting data is channel 0 to channel 3. The second rising edge of the SCLK input after reset de-assertion results in the output signals, QRX_DATA, QRX_VALID, QRX_CRS, and QCLSN, being locked to channel 3. The receive data for the first channel 3 slot is valid during the second rising edge of SCLK. Successive clock edges increment the channel slot number in a repetitive fashion. The repetitive channel order is channel 0 to channel 3. Consequently, all signal pins are synchronous to the clock pin, SCLK. The STRB (strobe) function of the QRST/STRB input pin allows the option to strobe the input for a single clock during normal operation to ensure alignment of the QuASI interface to channel 0. The use of the strobe option minimizes possibility of channel misalignments. In order to transmit a packet, QTX_EN needs to be asserted during the correct channel or slot number. If QTX_EN is asserted, then the NRZ QTX_DATA is interpreted and sent to the Manchester encode unit for transmission to the 10BASE-T or AUI interface. QTX_EN and QTX_DATA should contain the preamble and data portions of the frame to be sent. The End of Transmission Delimiter will be added by the encode unit. As an example, if channel 0 is the only transmit channel active, then QTX_EN signal will only be asserted during the slot time of channel 0. As part of the transmission process, the QTX_DATA data signal is looped back to the QRX_CRS and QRX_VALID signals when in half-duplex mode and the Link Pass State. When data is received from the network, the data is first placed in the Elasticity FIFO. There are three signals associated with the receive stream: QRX_CRS, QRX_VALID, and QRX_DATA. When receive data triggers the squelch paths of either the 10BASE-T or AUI receiver, the QRX_CRS signal is asserted at the earliest possible time. Receive Carrier Sense (QRX_CRS) signal is used for signaling real-time network activity to the external device connected to the QuEST device. Collision The AUI collision front-end circuit is similar to the AUI receiver circuit. The CI± inputs should be differentially terminated with two 40.2 Ω resistors with the middle node of the resistors connected to a 0.1 to 0.01 µF bypass capacitor to analog ground. In order for a collision to be detected, the differential receive data must pass negative amplitude and time duration. Once the collision circuit is unsquelched, the collision is indicated on the QCLSN signal during the port 0 multiplexed time slot. The AUI port can be configured as a full-duplex port for 10BASE-FL application. If configured as a full-duplex port, the collision indication will not be signaled on the QuASI Interface. When the AUI and Interrupt modes are enabled, the collision front end is changed to a single-ended input with the same threshold requirements as above. The positive signal of the collision differential pair is used as the collision input. The CI- signal is isolated and biased to an idle level. This frees up the external pin to be switched in with the interrupt driver circuitry and to function as an open drain interrupt output. QuASI Interface The QuASI interface provides four 10-Mbps Ethernet channels that are serially multiplexed to a set of shared pins. The data rate of these pins is four times faster than a standard 10-Mbps serial interface. The QuASI interface is composed of a clock, QRST/ STRB, and six signal pins. The purpose of this interface is to allow time division multiplexing of the digital serial 16 Am79C989 PRELIMINARY QRX_CRS signal is primarily useful for calibrating network timers in the external MAC or repeater device. Data which is held in the elasticity FIFO will be delayed. When the QRX_VALID (Receive Data Valid) is asserted in the appropriate slot, the QRX_DATA is valid. QRX_VALID is used as a framing signal to indicate when the QRX_DATA is valid. QRX_VALID and QRX_DATA will lag QRX_CRS by up to four bit times (400 ns) in the beginning of the frame and up to 8 bits by the end of the frame. The reason that QRX_VALID lags QRX_CRS signal by a variable amount of time is due to the inherent rate mismatch between the received data and network clocks. The QCLSN signal is asserted whenever a network collision is detected. QCLSN is time multiplexed like the other receive signals. QCLSN has a specific meaning within the specified channel or slot number. Collision indication is asserted in its appropriate time slot whenever a network collision is detected. The QCLSN pin may be optionally asserted if the SQE_TEST disable bit, Control Register (Reg. 18, bit 0), is in a cleared state after transmission of a packet. In summary, the QuASI Interface is synchronous to the clock input, SCLK. A reset signal, QRST/STRB, is provided which serves two purposes, hardware reset and a means for channel slot synchronization. There are six additional signal pins that communicate the serial data to and from the QuEST device. Management Interface The QuEST device incorporates a two-wire Management Interface in conformance with the MII Management Interface of the IEEE 802.3u Standard. The interface includes a management clock, MDC, and a serial data I/O pin, MDIO. The Management Interface clock can operate as high as 20 MHz; there is no lower frequency limit. The MDIO signal serves as both control and data. The first part of the command is composed of control information, while the second half is composed of data. The management frame format is indicated below. Table 1. ST READ WRITE 01 01 OP 10 01 PHYAD A4AAAA0 A4AAAA0 Management Frame Fields REGAD R4RRRR0 R4RRRR0 TA Z0 10 DATA D15DDDDDDDDDDDDDDD0 D15DDDDDDDDDDDDDDD0 IDLE Z Z The Management Frame The management frame begins with the Start of Frame (ST) delimiter indicated by a pattern. After the ST pattern, the Operation Code (OP) indicates either a read or a write, followed by the PHYAD and REGAD fields. The specific address is identified by the five bits of the PHY address (PHYAD); the specific register is identified by the five bits of the Register Address (REGAD). The Turn Around (TA) field follows and provides a two-cycle delay for redirecting the MDIO bus during read commands, to avoid signal contention. The management frame includes the 16-bit wide data field and terminates with an idle state indication. PHY Addressing PHYAD is the unique address of any PHY connected to this Serial Management Interface. Each QuEST supports four PHYs, and up to eight QuEST devices can be connected to the Management Interface. A total of 32 PHYs can be managed. (Refer to Table 2.) The internal QuEST address is formed through external means. During reset, the QRX_DATA, QRX_VALID, QRX_CRS, and QCLSN signals of the QuEST device are in tristate. At the rising edge of reset, the QuEST device latches signal pins QRX_VALID, QRX_CRS, and QCLSN to form the internal address which the QuEST device will use to match against. The QuEST device provides internal pull-down resistors of approximately 100 kΩ. Pull-up resistors of 10 kΩ in value can be placed on the QRX_DATA, QRX_VALID, and QCLSN signals to define the internally latched address. The internal latch address is shown below. The internally latched address must be unique among QuEST devices shared by a single Management Interface. To form the QuEST address “000,” no resistors need to be connected. To form the QuEST address “101”, external pull-up resistors are required to be added to the QRX_DATA and QCLSN signals, and so forth. A specific PHY address (PHYAD) is formed with five bits. The upper three bits of the PHYAD, A4, A3, and A2, are matched to an internal QuEST device address which acts as a chip selection function. Setting each of these three bits to 0 or 1 in combination allows specific designation of up to eight QuEST devices. The lower two bits of the PHYAD designate the channel number of the designated QuEST device. Am79C989 17 PRELIMINARY Table 2. QuEST Device Address Designations The data sheet specification for the QuEST device is for TTL input and output levels. The QuEST device meets these specifications, regardless of which supply voltage is used. The difference made by using a 3.3 V supply is that the MAXIMUM output voltage on the pins listed above is guaranteed by design not to exceed 3.3 V. PHYAD Bits A4 0 0 0 0 1 1 1 1 A3 0 0 1 1 0 0 1 1 A2 0 1 0 1 0 1 0 1 Signals with Pull up Resistors no signals QCLSN QRX_VALID QRX_ VALID, QCLSN QRX_DATA QRX_DATA, QCLSN QRX_DATA, QRX_ VALID QRX_DATA, QRX_ VALID, QCLSN REGISTER DESCRIPTION The QuEST device supports nine physical registers per port plus four registers which are globally shared among all four ports. In summary, there are 40 registers available. Table 4. Register and Port Matrix PHYAD [0:1] /Port Table 3. Channel Address Designations REGAD A0 0 1 0 1 Channel Number 0 1 2 3 1 2-3 4 5 6 7 8-15 16 17 18 19 20 0 Register Name Auto Negotiation Control Auto Negotiation Status Device ID Auto Negotiation Advertisement Auto Negotiation Link Partner Auto Negotiation Expansion Auto Negotiation Next Page Unused Status Change Interrupt Summary Status Control Status Error Mask 00 01 10 11 PHYAD Bit A1 0 0 1 1 Port Number 0 0 1 1 2 2 3 3 Shared 0 0 0 0 1 1 1 1 2 2 2 2 3 3 3 3 Interrupt Function The Interrupt function indicates when there is a change in the Link Status, Duplex Mode, Auto-Negotiation status, MAU Error status, or any combination thereof for any port. The Interrupt Register (Register 16) contains the interrupt status and interrupt enable bits. The status is always updated whether the interrupt enable bits are set or not. However, if the interrupt enable bits are set active, the logical OR of the selected bits will drive the QINT open drain output pin. When an interrupt occurs, the system will need to poll the interrupt register to determine the source of the interrupt and to clear the status bits. The individual registers can be read to determine the exact nature of the change in status. Individual bits clear on read (COR) except for the Jabber error, which is a Self-Clearing (SC) bit when the QuEST device exits the Jabber state. Unused Shared Shared 0 0 0 1 1 1 2 2 2 3 3 3 3.3 Volt Operation The QuEST device is designed to easily and reliably interface to systems with 3.3 V or 5 V power supplies. This is accomplished by having a separate power supply pin, VDDIO, which can be connected to either a 3.3 V or 5 V supply. The only pins affected by the choice of supply are: QRX_DATA, QRX_VALID, QRX_CRS, QCLSN, and MDIO. Shared Registers Four registers are globally shared among all four ports: Registers 2 and 3 designate the Device ID, Register 16 is Interrupt Enable and Status, and Register 17 is Summary Status. When accessing the shared registers, the lower two bits of the PHYAD address (bits A1 and A0) are ignored. 18 Am79C989 PRELIMINARY Table 5. REGAD 2-3 16 17 Shared Registers Register Name Device ID Interrupt Enable and Status Summary Status REGAD 0 1 4 5 6 7 18 19 20 Table 6. Port Registers Register Name Auto Negotiation Control Auto Negotiation Status Auto Negotiation Address Auto Negotiation Link Partner Auto Negotiation Expansion Auto Negotiation Next Page Control Status Error Mask Port Registers Nine physical registers in the QuEST device are allocated per port. Six of the port registers relate to AutoNegotiation. The remaining port registers are used for control. Registers 0, 1, 4-7, and 18-20 require an exact match to specify the port being addressed. A particular register is addressed by sending the serial management frame with the target address of the designated port. The lower two bits of the PHYAD (bits A1 and A0) specify which port is selected. Non-Implemented Registers Non-implemented registers should neither be written to or read. Reserved register bits within defined registers should be written with zeros. Reserved register bits may return undefined data and should be masked by software. Auto-Negotiation Control Register (Reg 0) The Auto-Negotiation Control Register (Reg 0) contains Read/Write (R/W), Read/Only (R/O), and SelfClearing (SC) bits. This register is duplicated for each port. Table 7. Bit(s) Name Auto-Negotiation Control Register (Reg 0) Description Read/ Write Default/ Reset 1 = Resets the Auto Negotiation Control and Status registers to their default state; 15 SRESET 0 = Has no effect. After reset is completed (approximately 10 µs), SRESET is cleared. 1 = Port will loop back the QTX_DATA to the QRX_DATA. Transmit data will not be transmitted and receive data from the network will be ignored. 0 = The port will receive and transmit normally. 13 12 Reserved ANEG_EN Written and read as zero. 1 = Auto-Negotiation enabled. 0 = Auto-Negotiation disabled. 1 = 10BASE-T port Auto-Negotiation is reset. The Auto-Negotiation process and Link Status State Machine will terminate. Link Test Pulses will terminate. 0 = 10BASE-T port resumes normal operation. 10 9 Reserved Restart ANEG Written and read as zero. 1 = Auto-Negotiation restarts. The bit will be cleared when the AutoNegotiation process completes. 0 = Has no effect. R/O R/W, SC 0 0 R/O R/W 0 1 R/W, SC 0 14 Loopback R/W 0 11 PWR_DN R/W 0 Am79C989 19 PRELIMINARY 1 = The port can be forced into full duplex operation when both the Duplex_Mode set and the ANEG_EN bit clear. If the ANEG_EN bit is set, this bit is ignored. When the Duplex_Mode is modified, the port status will not be modified unless the ANEG_EN bit is cleared. 0 = Port is forced to half-duplex mode when ANEG_EN bit is cleared. If ANEG_EN bit is set, this bit is ignored. 7 6:0 Collision Test Reserved 1 = Collision indication will occur on the channel after the transmit enable bit (QTX_EN) is asserted. 0 = Port operation is normal. Written and read as zero. R/O 0 R/W 0 8 Duplex_Mode R/W 0 Auto-Negotiation Status Register (Reg 1) The Auto-Negotiation Status Register (Reg 1) contains Read/Only (R/O) bits or Clear on Read (COR) bits. This register is duplicated for each port. Table 8. Bit(s) 15:13 12 Name Reserved Full Duplex Auto-Negotiation Status Register (Reg 1) Description Read/ Write R/O R/O Default/ Reset 0 1 Written and read as zero. 1= Capable of operation in full duplex mode; 0 = Not able to perform full duplex mode. 1= Capable of operation in half duplex mode; 0 = Not able to perform half duplex mode. Written and read as zero. 1 = Management Interface operates with or without preamble suppression; 0 = Not applicable: Management Interface will operate with or without preamble suppression. 1 = Auto-Negotiation is complete; 0 = Auto-Negotiation is not complete. 1 = Remote fault detected from link partner; 0 = No remote fault detected. 1 = Capable of Auto-Negotiation; 0 = Not available 1 = Link is up; 0 = Link is down. 1 = Jabber Condition detected; 0 = Jabber Condition not detected. 1 = Extended Register Capability; 0 = Not applicable. 11 10:7 Half Duplex Reserved Preamble Suppress Auto-Negotiation Complete Remote Fault R/O R/O 1 0 6 R/O 1 5 R/O 0 4 R/O, COR 0 3 Auto-Negotiation Ability R/O 1 2 Link Status R/O 0 1 Jabber Detect Extended Register Capability R/O 0 0 R/O 1 20 Am79C989 PRELIMINARY Device ID Registers (Reg 2-3) D evice ID Registers (Reg 2-3) contain Read/Only (R/O) bits. Registers 2 and 3 designate a unique Device ID: the manufacturer ID is designated by Reg 2 bits 15:0 and Reg 3 bits 15:10; the model number is designated by Reg 3 bits 9:4; the Revision Number is designated by Reg 3 bits 3:0. This register is not duplicated for each port. Table 9. Bit(s) 15:0 Name PHY_ID[31:16] Description Register 2 Read/Write R/O Default/Reset (binary) 0000 0000 0000 0000 Default/Reset (Hex) 0000 Bits 3-18 of the IEEE Organizationally Unique Identifier. Table 10. Bit(s) 15:10 Name PHY_ID[15:10] Description Register 3 Read/Write R/O Default/Reset (binary) 01 1010 01 1111 0000 Default/Reset (Hex) 1A Bits 19-24 of the IEEE Organizationally Unique Identifier. QuEST Model Number Revision Number 9:4 3:0 PHY_ID[9:4] PHY_ID[3:0] R/O R/O 1F 0 Auto-Negotiation Advertisement Register (Reg 4) The Auto-Negotiation Advertisement Register (Reg 4) contains Read/Write (R/W) or Read/Only (R/O) bits. This register contains the advertised ability of the QuEST device. This register is duplicated on a per port basis. The purpose of this register is to advertise the technology ability to the link partner device. When this register is modified, Restart Auto-Negotiation (Reg 0, bit 9) must be set to advertise the change. Table 11. Bit(s) 15 14 Name Next Page Reserved Auto-Negotiation Advertisement Register (Reg 4) Description Read/ Write R/W R/O Default/ Reset 0 0 1 = Next page exchange requested; 0 = Next page exchange not requested. Written and read as zero. 1 = Remote fault bit is inserted into the base link code word during the Auto-Negotiation process; 0 = The base link code work will have the bit position for remote fault as cleared. Written and read as zero. Written and read as zero. 1 = Full Duplex capability is advertised; 0 = Full Duplex capability is not advertised. 13 Remote Fault R/W 0 12:11 10:7 6 Reserved Reserved Full Duplex R/O R/O R/W 0 0 0 5 4:0 Half duplex 1 = Half Duplex capability is advertised; 0 = Half Duplex capability is not advertised R/W R/O 1 0x01 Selector Field The QuEST device is an IEEE 802.3 compliant device. Note: When this register is modified, Restart Auto-Negotiation (Reg 0, bit 9) must be set to advertise the change. Am79C989 21 PRELIMINARY Auto-Negotiation Link Partner Ability Register (Reg 5) The Auto-Negotiation Link Partner Ability Register (Reg 5) describes the advertised ability of the link partner. The register is Read/Only (R/O). The bits represent the received link code word. This register contains either the base page or the link partner's next pages. This register is duplicated for each port. Table 12. Bit(s) 15 Name Next Page Base Page Format Description Read/ Write R/O Default/ Reset 0 1 = Link partner next page requested; 0 = Link partner next page not requested. 1 = Link Partner acknowledged; 0 = Link Partner not acknowledged. 1 = Link Partner has a remote fault; 0 = Link Partner does not have a remote fault. Link Partner technology ability. Link partner selector field. 14 Acknowledge R/O 0 13 12:5 4:0 Remote Fault Technology Ability Selector Field R/O R/O R/O 0 0 0 Table 13. Bit(s) 15 Name Next Page Next Page Format Description Read/ Write R/O Default/ Reset 0 1 = Link partner next page requested; 0 = Link partner next page not requested. 1 = Link Partner acknowledged; 0 = Link Partner not acknowledged. 1 = Link Partner message page; 0 = Link Partner unformatted next page. 1 = Link Partner can comply with the request 0 = Link Partner cannot comply with the request. Link partner toggle bit. Link partner's message code. 14 Acknowledge R/O 0 13 Message Page R/O 0 12 11 10:0 Acknowledge 2 Toggle Message Field R/O R/O R/O 0 0 0 22 Am79C989 PRELIMINARY Auto-Negotiation Expansion Register (Reg 6) The Auto-Negotiation Expansion Register (Reg 6) provides additional information which assists in the AutoNegotiation process. The Auto-Negotiation Register bits are Read/Only (R/O) or Cleared on Read (COR). This register is duplicated for each port. Table 14. Bit(s) 15:4 3 Name Reserved Link Partner Next Page Able Next Page Able Auto-Negotiation Expansion Register (Reg 6) Description Read/ Write R/O R/O Default/ Reset 0 0 Written and read as zero. 1 = Link partner is next page able. 0 = Link partner is not next page able. 1 = QuEST device port is next page able. 0 = Not applicable. 1 = A new page has been received. 2 R/O 1 1 Page Received 0 = A new page has not been received. Cleared on Read. R/O, COR 0 0 Link Partner Auto- 1 = Link partner is Auto-Negotiation able. Negotiation Able 0 = Link partner is not Auto-Negotiation able. R/O 0 Auto-Negotiation Next Page Register (Reg 7) The Auto-Negotiation Next Page Register (Reg 7) contains the next link page link code word to be transmitted. The Auto-Negotiation Next Page Register contains Read/Write (R/W) or Read/Only (R/O) bits. On powerup the default value of 0x2001 represents a message page with the message code set to null. This register is duplicated for each port. Table 15. Bit(s) 15 14 13 Name Next Page Reserved Message Page Auto-Negotiation Next Page Register (Reg 7) Description Read/ Write R/W R/O R/W Default/ Reset 0 0 1 1 = QuEST device port next page requested; 0 = QuEST device port next page not requested. Written and read as zero. 1 = QuEST device port message page requested; 0 = QuEST device port unformatted page requested. 1 = QuEST device port can comply with the request; 0 = QuEST device port cannot comply with the request. QuEST device port toggle bit. Message code field. 12 11 10:0 Acknowledge 2 Toggle Message Field R/W R/O R/W 0 0 0x001 Am79C989 23 PRELIMINARY Interrupt Status and Enable Register (Reg 16) Interrupt Status and Enable Register (Reg 16) contains Read/Write (R/W), Read/Only (R/O), or Cleared on Read (COR) bits. This register is shared across all ports. Table 16. Bit(s) 15:13 12 Name Reserved Link Status Change Interrupt Enable Duplex Change Interrupt Enable Auto-Negotiation Change Interrupt Enable 9 MAU Error Interrupt Enable Global Interrupt Enable Reserved Link Status Change Interrupt Interrupt Status and Enable Register (Reg 16) Description Read/ Write R/O R/W Default/ Reset 0 0 Written and read as zero. 1 = Link Status Change Interrupt drives the QINT pin; 0 = The Interrupt is masked. 1 = Duplex Change Interrupt drives the QINT pin; 0 = The Interrupt is masked. 1 = Auto-Negotiation Change Interrupt drives the QINT pin (i.e., new page received); 0 = The Interrupt is masked. 1 = MAU Error Interrupt drives the QINT pin; 0 = The Interrupt is masked. 1 = Any Interrupt drives the QINT pin; 0 = The Interrupt is masked. Written and read as zero. 1 = Link Status changed on one of the 4 ports; 0 = No change in Link Status. Register bit is cleared on Read. 1 = Duplex mode changed on one of the 4 ports; 0 = Indicates no change in Duplex mode. Register bit is cleared on Read. 1= Auto-Negotiation status has changed on one of the 4 ports; 0 = Indicates no change. Register bit is Cleared on Read. 1 = A MAU error has occurred on one of the 4 ports; set on any error bit in the Status Register (Reg 19) for any port; 0 = Indicates no MAU errors have occurred. Register bit is cleared on Read. 11 R/W 0 10 R/W 0 R/W 0 8 7:5 R/W R/O 0 0 4 R/O, COR 0 3 Duplex Change Interrupt Auto-Negotiation Change Interrupt R/O, COR 0 2 R/O, COR 0 1 MAU Error Interrupt R/O, COR 0 0 Global Interrupt 1 = Change in status of any of the above interrupts; 0 = No Interrupt condition. Register bit is Cleared on Read. R/O, COR 0 24 Am79C989 PRELIMINARY Summary Status Register (Reg 17) The Summary Status Register (Reg 17) is a global register accessible to all ports. This register is Read/Only (R/O). The summary register allocates four bits per each port. Each port conveys: Link Status, Duplex Status, Auto-Negotiation Alert, and 10BASE-T MAU Error. Table 17. Bit(s) 15 Name Link Status Port 3 Full Duplex Port 3 Summary Status Register (Reg 17) Description Read/ Write R/O Default/ Reset 0 1 = Link Status of port 3 is up; 0 = Link Status of port 3 is down. 1 = Port 3 is operating in full duplex mode; 0 = Port 3 is operating in half duplex mode. 14 R/O 0 13 1 = Status of Auto-Negotiation function for port 3 has changed Auto-Negotiation Alert (i.e, new page received); Port 3 0 = Auto-Negotiation function for port 3 does not require servicing. MAU Error Port 3 Link Status Port 2 Full Duplex Port 2 1= 10BASE-T MAU error for port 3 summary; 0= No MAU Error on Port 3. 1 = Link Status of port 2 is up; 0 = Link Status of port 2 is down. 1 = Port 2 is operating in full duplex mode; 0 = Port 2 is operating in half duplex mode. R/O 0 12 R/O 0 11 R/O 0 10 R/O 0 9 1 = Status of Auto-Negotiation function for port 2 has changed (i.e, Auto-Negotiation Alert new page received); Port 2 0 = Auto-Negotiation function for port 2 does not require servicing. MAU Error Port 2 Link Status Port 1 Full Duplex Port 1 1= 10BASE-T MAU error for port 2 summary; 0= No MAU Error on Port 2. 1 = Link Status of port 1 is up; 0 = Link Status of port 1 is down. 1 = Port 1 is operating in full duplex mode; 0 = Port 1 is operating in half duplex mode. R/O 0 8 R/O 0 7 R/O 0 6 R/O 0 5 1 = Status of Auto-Negotiation function for port 1 has changed (i.e, Auto-Negotiation Alert new page received); Port 1 0 = Auto-Negotiation function for port 1 does not require servicing. MAU Error Port 1 Link Status Port 0 Full Duplex Port 0 1= 10BASE-T MAU error for port 1 summary; 0= No MAU Error on Port 1. 1 = Link Status of port 0 is up; 0 = Link Status of port 0 is down. 1 = Port 0 is operating in full duplex mode; 0 = Port 0 is operating in half duplex mode. R/O 0 4 R/O 0 3 R/O 0 2 R/O 0 1 1 = Status of Auto-Negotiation function for port 0 has changed (i.e, Auto-Negotiation Alert new page received); Port 0 0 = Auto-Negotiation function for port 0 does not require servicing. MAU Error Port 0 1= 10BASE-T MAU error for port 0 summary; 0= No MAU Error on Port 0. R/O 0 0 R/O 0 Am79C989 25 PRELIMINARY Control Register (Reg 18) The Control Register (Reg 18) configures the port in conjunction with the Auto-Negotiation registers. The Control Register contains Read/Write (R/W) or Read/ Only (R/O) bits. This register is duplicated for each port. Table 18. Bit(s) Name Control Register (Reg 18) Description Read/ Write Default/ Reset 1 = 10BASE-T link integrity state machine is forced to the “link good” state; 15 Force Link Good Enable 0 = Normal operation resumes. For internal test only (when link pulses are absent). Not for general use in 10BASE-T applications. 14:6 Reserved Written and read as zero. 1 = For port 0, the Interrupt function through the QINT/CI- pin will be active and the AUI port, if selected (bit 2 set), will operate in PCI mode. 5 Interrupt Enable 0 = For port 0, the interrupt function will not be available. Ports 1, 2, and 3 are don’t cares. Not effected by SRESET. 4 Disable Link Pulse Generation 1 = Link pulses sent from the 10BASE-T transmitter are suppressed; 0 = Link Pulses not suppressed. R/W 0 R/W 1 R/O 0 R/W 0 3 1 = Polarity correction circuit at the front-end of the receive port disabled (when the receive function is disabled, the receive port will Auto Receive Polarity Correction only accept frames with correct polarity); Disable 0 = Self-correcting polarity circuit will be enabled at the receive interface of the device. AUI Select Enable 1 = For port 0, Attachment Unit Interface is substituted for 10BASE-T port 0; 0 = Port 0 reverts to 10BASE-T function. Ports 1, 2, and 3 are don’t cares. Not effected by SRESET. R/W 0 2 R/W 0 1 1 = 10BASE-T receive squelch thresholds reduced for reception of Extended Distance frames farther than 100 meters. Enable 0 = Squelch thresholds at standard 100 meter distance. 1 = SQE heartbeat, which occurs after each transmission, disabled; 0 = Heartbeat asserted on QCLSN approximately 1 µs after transmission, for a duration of 1 µs; When the port is configured for full duplex, heartbeat signal is automatically disabled. R/W 0 0 SQE_TEST Disable R/W 0 26 Am79C989 PRELIMINARY Status Register (Reg 19) The Status Register (Reg 19) contains Read/Only (R/ O) and Cleared on Read (COR) bits which indicate Bit(s) 15:3 Name Reserved Rate Mismatch Error Receive Polarity Reversed Written and read as zero. 1 = Frames received underflowed or overflowed the elasticity FIFO; 0 = No rate mismatch has occurred. Register bit is cleared on Read. 1 = Receive polarity of the 10BASE-T receivers is reversed; 0 = Receive polarity is correct. 1 = 10BASE-T transmit circuit is in the Jabber state; 0 Jabber Error 0 = 10BASE-T transmit circuit not in the Jabber state. This bit is automatically cleared when the jabber condition terminates. R/O 0 R/O 0 R/O, COR 0 status beyond the Auto-Negotiation status registers. This register is duplicated for each port. Description Read/ Write R/O Default/ Reset 0 2 1 Error Mask Register (Reg 20) The Error Mask Register (Reg 20) determines which errors will be reported in the Summary Register (Reg 16). The Error Mask Register contains Read/Write (R/W) or Read/Only (R/O) bits. If an error does occur and the Mask enable bit is set the Error bit in the Summary Register (Reg 17) will not be asserted. This register is duplicated for each port. Table 19. Bit(s) 15:3 2 Name Reserved Rate Mismatch Error Enabled Receive Polarity Reversed Error Enable Jabber Error Enable Error Mask Register (Reg 20) Description Read/ Write R/O R/W Default/ Reset 0 0 Written and read as zero. 1 = Rate Mismatch Error reportable in the Summary Register; 0 = Rate Mismatch Error not reportable in the Summary Register. 1 = Receive Polarity Reversed reportable in the Summary Register as an Error; 0 = Receive Polarity Reversed bit not reportable as an error in the Summary Register. 1 = Jabber error reportable in the Summary Register; 0 = Jabber error not reportable in the Summary Register. 1 R/W 0 0 R/W 0 Am79C989 27 PRELIMINARY SYSTEM APPLICATIONS 10 Mbps Ethernet Switch The QuEST device is targeted for use in 10BASE-T switching applications. The QuEST device provides four 10BASE-T receive and transmit ports. Optionally, one of the 10BASE-T ports can be reprogrammed as an AUI. The four Ethernet ports are multiplexed into the QuASI interface which interfaces to a switching subsystem. The QuEST device provides 10BASE-T filterless technology and a reduced pin count which enables high levels of switch integration. QuEST VDD TXD0+ 110 Ω TXD0RXD0+ RXD0- 100 Ω REXT VDD VDD VDD TXD1+ TXD1RXD1+ QTX_EN QTX_DATA QRX_DATA QRX_VALID QCLSN QRX_CRS SCLK QRST/STRB TXD3+ TXD3- 110 Ω RXD3+ RXD3PCI/CI+ or MDC MDIO MDC MDIO CIDI+ 40.2 Ω 40.2 Ω 40.2 Ω 40.2 Ω 100 Ω 1:1 RXD2+ 100 Ω RXD2TXD2+ TXD2110 Ω 1:1 RXD11:1 RJ45 Connector 13 kΩ 1:1 10 kΩ 10 kΩ Switch Interface TX_EN TX_DATA RCV_DATA RCV_DV CLSN RCV_CRS SCLK RESET 10 kΩ 110 Ω 1:1 RJ45 Connector 100 Ω 1:1 RJ45 Connector 1:1 RJ45 Connector VDD 1:1 10 kΩ INT QINT 1:1 AUI Connector (Optional) 0.01 µF to 10.1 µF 1:1 0.01 µF to 10.1 µF 1:1 DIShared Signals DO+ DO- Note: If QINT and the AUI port are used, a special circuit (not shown) is needed for PCI. Optional 10K resistors are used to set internal address match for Management Address. 21173B-5 Figure 1. QuEST Device Application Diagram 28 Am79C989 PRELIMINARY ABSOLUTE MAXIMUM RATINGS Storage Temperature . . . . . . . . . . . . .-65°C to +150°C Ambient Temperature . . . . . . . . . . . . . . . 0°C to +70°C Supply Voltage . . . . . . . . . . . . . . . . . . -0.3 V to +6.0 V DC Voltage applied to any Pin can be . . VSS -0.5 V to VDD +0.5 V OPERATING RANGES Commercial (C) Devices Temperature (TA) . . . . . . . . . . . . . . . . . .0°C to +70°C Supply Voltages (VDDIO, VDD, VDDTX) . . . . . +5 V ±5% Supply Voltages (VDDIO) . . . . . . . . . . . . . . +3.3 V ±5% Stresses above those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent device failure. Functionality at or above these limits is not implied or recommended. Exposure to Absolute Maximum Ratings for extended periods may affect device reliability. Programming conditions may differ. Operating ranges define those limits between which the functionality of the device is guaranteed. DC CHARACTERISTICS over operating ranges unless otherwise specified Parameter Symbol Parameter Description Test Conditions Min Max Unit Digital Interface Input Voltage VIL VIH Input LOW Voltage Input HIGH Voltage 2.0 0.8 VDDIO + 0.5 V V Digital Interface Output Voltage VOL VOH Output LOW Voltage Output HIGH Voltage Output HIGH Voltage VOH1 (QRX_VALID, QRX_DATA, QRX_CRS, QCLSN, MDIO) IOL = 4.0 mA VDDIO = 5.0 Volts IOH = -0.4 mA VDDIO = 3.3 Volts IOH = -0.4 mA 2.4 0.4 V V 2.4 - V Digital Input Leakage IIH IIL Input Leakage Current High Input Leakage Current Low 0