October 1998
DP83924BVCE
Quad 10 Mb/s Ethernet Physical Layer - 4TPHY™
■ Programmable MAC Interface supports most
General Description
standard 7 signal MAC interfaces
■ Twisted Pair Transceiver Module
– On-chip filters for transmit outputs
– Low Power Driver
The DP83924B Quad 10Mbps Ethernet Physical Layer
(4TPHY) is a 4-Port Twisted Pair PHYsical Layer Trans-
ceiver that includes all the circuitry required to interface
four Ethernet Media Access Controllers (MACs) to
10BASE-T. This device is ideally suited for switch hub
applications where 8 to 32 ports are commonly used.
– Heartbeat and Jabber Timers
– Link Disable and Smart Receive Squelch
– Polarity detection and correction
– Jabber Enable/Disable
The 4TPHY has three dedicated 10Base-T ports. There is
an additional port that is selectable for either 10Base-T or
for an Attachment Unit Interface (AUI). In 10Base-T mode,
any port can be configured to be Half or Full Duplex.
(Continued)
– Isolate mode for diagnostics
– Low Power Class AB Attachment Unit Interface (AUI)
Driver for one port
Features
– Enhanced Supply Rejection
– Enhanced Jitter Performance
– Diagnostic Endec Loopback
– Squelch on Collision and Receive Pair
■ 100 pin package
■ 10BASE-T and AUI interfaces
■ Automatic or manual selectionof twisted pair or Attach-
ment Unit Interfaces on port 1
■ Serial LED interface for LINK, POLARITY, ACTIVITY,
■ Direct Interface to NRZ Compatible controllers
and ERROR.
■ IEEE 802.3u Auto-Negotiation between 10Mb/s Full
■ JTAG Boundary Scanper IEEE 1149.1
and Half Duplex data traffic and parallel detection
■ MII-like Serial management interface for configuration
and monitoring of ENDEC/Transceiver operation.
System Diagram
MAC Serial
NRZ Interface
RXD4,RXC4,COL4,CRS4
TXD4,TXE4
10BASE-T
TPI
RXD3,RXC3,COL3,CRS3
TXD3,TXE3
ports 1-4
RXD2,RXC2,COL2,CRS2
DP83924B
TXD2,TXE2
MAC
10BASE-2
AUI
RXD1,RXC1,COL1,CRS1
TXD1,TXE1
(port 1option)
TXC
MDIO
MDC
Serial Mgmt Interface
4TPHY™ is a trademark of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
www.national.com