DM9081 Datasheet, PDF (1/22 Pages) List of Unclassifed Manufacturers – 10BASE-T Hub Controller

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
DM9081
10BASE-T Hub Controller
Interface (AUI) 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
NRZ DATA
MUX
EXPANSION
PORT
LED PORT1
MANCHESTER
DECODER
RX
MUX
DATA IN
AUI
PORT1
PLL
MANCHESTER
ENCODER
DATA OUT
STATE
MACHINE
TIMER
LED PORT2
AUI
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
1
Version: DM9081-DS-F01
April 22, 1997