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DP83924A Datasheet

  • DP83924A

  • 30頁

  • ETC

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DP83924A Quad 10 Mb/s Ethernet Transceiver
PRELIMINARY
October 1997
DP83924A Quad 10 Mb/s Ethernet Transceiver
General Description
The Quad 10 Mb/s Ethernet Transceiver is a 4-Port
Encoder/Decoder (ENDEC) that includes all the circuitry
required to interface four Ethernet Media Access Control-
lers (MACs) to 10BASE-T. This device is ideally suited for
switch hub applications where 8, 16, 24, or 32 ports are
commonly used.
Features
s
s
s
s
100 pin package
10BASE-T and AUI interfaces
4 ports TP interface with TRI-STATE control
Single Full AUI and TP Interface on port 1 supports 50
meter drops
The DP83924A has three dedicated 10BASE-T ports.
s
Automatic or manual selection of twisted pair or Attach-
ment Unit Interfaces on port 1
There is an additional port that is selectable for either
10BASE-T or for an Attachment Unit Interface (AUI). In
s
Direct Interface to NRZ Compatible controllers
10BASE-T mode, any port can be con鏗乬ured to be Half or
s
MII-Like Management Interface (Continued)
Full Duplex. (Continued)
System Diagram
R
TX
R
EQ
Reference
TXE
TXD
TXC
X1
Oscillator
Prescaler
TXU+
Transmit
Control
Interface
Manchester
Encoder and
Data Ctl.
Transmit
Pre-empha-
sis/TX Logic
Transmit
Filter
Output
Driver
TXU-
TX+
TX-
MDC
MDIO
Manage-
ment Con-
trol Interface
Con鏗乬ura-
tion Reg-
isters
TP LBK
AUI LBK
Link
Generator
AUI Collision
+
-
CD+
CD-
LED_CLK
LED_DATA
LED Control
Interface
Link
Detector
Heartbeat
Jabber Timer
Common
Analog/PLL
for Wave
Shapers
TP
Rcv
Collision
Decoder
+
MUX
Smart
Squelch
AUI Rcv
RXI+
RXI-
RX+
RX-
AUI Port 1 only
-
+
COL
CRS
RXD
RXC
Receive
Control
Interface
Phase
Lock Loop
Decoder
MUX
-
ENDEC-Transceiver
Block (replicated 4
times)
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
漏
1997 National Semiconductor Corporation
www.national.com
AUI Port 1 only
Transmit
AUI Driver

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