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DM9081 Datasheet Preview

DM9081 Datasheet

10BASE-T Hub Controller

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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 is compliant
with 10BASE-T standards. The DM9081 provides
eight integral Twisted Pair Media Attachment Units
(MAUs) and two Attachment Unit Interface (AUI)
DM9081
10BASE-T Hub Controller
ports in a 100-pin QFP package.
The total number of ports per repeater unit can be
increased by connecting multiple DM9081 chips via
their expansion ports. The DM9081 supports LED
drivers to monitor port status. It displays Link, Carrier
Sense, Collision, Partition, and Bit Rate Error Status.
In minimum mode, Link, Carrier Sense, and Collision
Status can be displayed without external TTL
devices.
Block Diagram
EXPIN#
EXPOUT#
DAT
TX
MUX
PREAMBLE
JAM SIGNAL
FIFO
RX_CLK
MANCHESTER
DECODER
PLL
RX
MUX
DATA IN
AUI
PORT1
AUI
PORT2
NRZ DATA
MUX
MANCHESTER
ENCODER
DATA OUT
EXPANSION
PORT
LED PORT1
STATE
MACHINE
TIMER
LED PORT2
TP
PORT0
*
*
*
*
*
TP
PORT7
RXP1
RXN1
CDP1
CDN1
TXP1
TXN1
RXP2
RXN2
CDP2
CDN2
TXP2
TXN2
RXD0+
RXD0-
TPO0+
DTPO0+
DTPO0-
TPO0-
RXD7+
RXD7-
TPO7+
DTPO7+
DTPO7-
TPO7-
Final
Version: DM9081-DS-F02
February 02, 2001
1




DAVICOM

DM9081 Datasheet Preview

DM9081 Datasheet

10BASE-T Hub Controller

No Preview Available !

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 .................................................. 6
  Auto Partition/Reconnection.................................. 6
  Fragment Extension .............................................. 6
  Link Integrity Test .................................................. 6
  Jabber Lockup Protection ..................................... 7
  Reset ..................................................................... 7
  Expansion Port ...................................................... 7
  External Logic........................................................ 8
  LED Functions....................................................... 9
  Collision Status...................................................... 9
  AUI1 Port Status.................................................... 9
  AUI2 Port Status.................................................... 9
  Minimum Mode...................................................... 9
  TP Port Status ....................................................... 9
  Normal Mode....................................................... 10
  LED Latch............................................................ 10
  AUI Ports Status.................................................. 11
  TP Ports Bit Rate Error Status ............................ 11
  TP Ports Jabber Status ....................................... 11
  TP Ports Partition Status ..................................... 11
  Traffic Status ....................................................... 11
  TP Port Link Status ............................................. 11
DM9081
10BASE-T Hub Controller
  DM9081 Chip External Components .................. 12
Absolute Maximum Ratings ................................... 13
DC Electrical Characteristics.................................. 13
AC Characteristics.................................................. 14
Timing Waveforms
  Expansion Port Input Timing............................... 15
  Expansion Port Output Timing ............................ 15
  Expansion Port Collision Timing ......................... 16
  AUI Transmit Timing ........................................... 16
  AUI Receive Timing ............................................ 17
  AUI Collision Timing............................................ 17
  Transmit Timing .................................................. 17
  Receive Timing ................................................... 18
  Link Integrity Timing ............................................ 18
Layout Recommendation
  Decoupling .......................................................... 19
  Power Plane........................................................ 19
Package Information .............................................. 21
Ordering Information .............................................. 22
Disclaimer............................................................... 22
Company Overview ................................................ 22
Products ................................................................. 22
Contact Windows ................................................... 22
2 Final
Version: DM9081-DS-F02
February 02, 2001


Part Number DM9081
Description 10BASE-T Hub Controller
Maker DAVICOM
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