DM9081FP DAVICOM [Davicom Semiconductor, Inc.], DM9081FP Datasheet
DM9081FP
Related parts for DM9081FP
DM9081FP Summary of contents
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General Description The 10BASE-T Hub Controller (DM9081) provides a system level solution for designing IEEE-compliant 802.3 repeaters that incorporate 10BASE-T transceivers. This device integrates the repeater functions specified by section 9 of the IEEE 802.3 standard. The Twisted Pair transceiver ...
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Table of Contents General Description.................................................. 1 Block Diagram .......................................................... 1 Table Of Contents .................................................... 2 Features.................................................................... 3 Pin Configuration ...................................................... 3 Pin Description ......................................................... 4 Functional Description .............................................. 6 Repeater function .................................................. 6 Signal Regeneration.............................................. 6 Collision Function ...
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Features Repeater functions comply with IEEE 802.3 Repeater Unit specification Eight Integral 10BASE-T transceivers utilize the required pre-distortion transmission technique Two Attachment Unit Interface (AUI) ports allow connection with 10BASE5 (Ethernet) and 10BASE2 (Cheapernet) networks Design a Dumb Hub in ...
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Pin Description Pin No. Pin Name Transceiver 100, 1 DTPO3+/- 99, 2 TPO3+/- 34, 31 TPO4+/- 33, 32 DTPO4+/- 39, 36 TPO5+/- 38, 37 DTPO5+/- 44, 41 TPO6+/- 43, 42 DTPO6+/- 49, 46 TPO7+/- 48, 47 DTPO7+/- 84, 87 TPO0+/- ...
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Pin Description Pin No. Pin Name Miscellaneous 30, 40, 50, 83, 93 14, 21, DGND 35, 45, 88 RESET# 20, 19 TESTPIN0 TESTPIN1 26 67 ...
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Functional Description The DM9081 Integrated Multiport Controller is a single chip implementation of an IEEE 802.3 Ethernet repeater (Hub). The DM9081 chip provides eight integral 10BASE-T ports plus two AUI ports, comprising the basic repeater. The DM9081 is also expandable, ...
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Jabber Lockup Protection The DM9081 chip implements a built-in jabber protection scheme to ensure that the network is not disabled due to transmission of excessively long data packets. This protection scheme will automatically interrupt the transmitter circuits of the DM9081 ...
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External Logic A simple logic scheme is required when more than two DM9081 chips are connected to increase the total number of repeater ports. The external logic should have one input (EXPOUT#) and one output EXPIN1# = EXPIN2# = EXPIN3# ...
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LED Functions The DM9081 provides LED functions to monitor the TP and AUI ports. Collision Status The COL_LED pin displays the collision status of the DM9081. When the DM9081 detects a collision, the COL_LED will drive low for more than ...
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Normal Mode In normal mode, TESTPIN0 and TESTPIN1 must be pulled high. The COL_LED, AUI1_CRS_LED and AUI2_CRS_LED pins are defined as minimum mode, whereas the other LED drive pins require external devices to display the status from the LED pins. ...
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AUI Ports Status The AUI_LED pin transmits the status of DM9081's two AUI ports on the falling edge of TCK. Figure 5 shows a typical external hardware setup employed to convert a serial bit stream into parallel form. The accuracy ...
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DM9081 Chip External Components Figure 5 shows a typical twisted pair port external components schematic diagram. The resistor used should have a 1% tolerance to ensure compliance with 10BASE-T networks. The filters and pulse transformers are necessary devices that have ...
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Absolute Maximum Ratings Absolute Maximum Ratings* ( 25°C ) Symbol D ,A Supply Voltage VCC VCC V DC Input Voltage (VIN Output Voltage(VOUT) OUT Tc Case Temperature Range Tstg Storage Temperature Rang (Tstg) L Lead Temp. (TL, ...
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TPO+/TPO-/DTPO+/DTPO-: V Low OL V High OH DC Output Series Impedance Drives TP0 R RXD+/RXD- Input Resistance TPI Power Supply Current I Power Supply Current (idle) DD Power Supply Current (Transmitting with TP Port load) AC Electrical Characteristics ...
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Timing Waveforms Expansion Port Input Timing Symbol Parameter t DAT Setup Time DJSET t DAT Hold Time DJHOLD X2 TCK EXPOUT EXPIN DAT Expansion Port Output Timing Symbol t TCK Rising Edge to EXPOUT# Driven Low HRL t TCK Rising ...
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Expansion Port Collision Timing Symbol t DAT Data Off DOFF X2 TCK EXPOUT EXPIN DAT AUI Transmit Timing Symbol Parameter t X2 Rising Edge To TXP/TXN Toggle TXTD t TXP, TXN Rise Time (10% to 90%) TXTR t TXP, TXN ...
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AUI Receive Timing Symbol t RXP/RXN Pulse Width Accept/Reject Threshold PWORX t RXP/RXN Pulse Width Maintain/Turn-Off Threshold PWKRX RXP/RXN VASQ tPWKRX t PWORX AUI Collision Timing Symbol t CDP/CDN Pulse Width Accept/Reject Threshold PWOCD t CDP/CDN Pulse Width Maintain/Turn-off Threshold ...
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Receive Timing Symbol t RXD+ High To Idle Time ROFF + RXD - RXD Link Integrity Timing Symbol t Transmitted Link Integrity Pulse Period LP t Link Integrity Pulse Width For TPO+ LPWT t Link Integrity Pulse Width For DTPO+/- ...
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Layout Recommendation Decoupling The DM9081 contains both analog and digital elements. Separate power pins are provided for the analog sections, the digital portion of TP line drivers, the TP line drivers, and the digital core logic. Care should be taken ...
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Power Plane The board power planes must be separated into analog and digital portions. The +5V and ground planes can be laid out according to the configuration shown in Figure 8. The analog portion should be located under the analog ...
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Package Information QFP 100L Outline Dimensions 100 See Detail F Seating Plane Symbol Note: 1. Dimensions D&E do not include resin fins. 2. Dimensions G design reference only. 3. All dimensions ...
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... Ordering Information Part Number Pin Count DM9081F 100 DM9081FP 100 Disclaimer The information appearing in this publication is believed to be accurate. Integrated circuits sold by DAVICOM Semiconductor are covered by the warranty and patent indemnification provisions stipulated in the terms of sale only. DAVICOM makes no warranty, express, statutory, implied or by ...