DM9081_01 Datasheet, PDF (1/22 Pages) Davicom Semiconductor, Inc. – 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 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
1
Version: DM9081-DS-F02
February 02, 2001