DM9081FP Datasheet, PDF (1/2 Pages) Davicom Semiconductor, Inc. – 10BASE-T Hub Controller

DM9081FP Product Brief
10BASE-T Hub Controller
May 2008 Rev.1.0
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) 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-