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DP83934CVUL-20 Datenblatt(Datasheet) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Teile-Nr. DP83934CVUL-20
Beschreibung  MHz SONICTM-T Systems-Oriented Network Interface Controller with Twisted Pair Interface
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Hersteller  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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20 Pin Description
I e
Input
O e
Output
Z e
TRI-STATE
Input TTL compatible
ECL e Emitter Coupled Logic type drivers for interfacing to
the Attachment Unit Interface
TP e
Totem Pole type drivers These drivers are driven
either high or low and are always driven Drive lev-
els are CMOS compatible
TRI e TRI-STATE drivers These pins are driven high low
or TRI-STATE Drive levels are CMOS compatible
These pins may also be inputs (depending on the
pin)
OC e Open Collector type drivers
These drivers are
TRI-STATE when inactive and are driven low when
active These pins may also be inputs (depending
on the pin)
TPI e Twisted Pair Interface
Pin names which contain a ‘‘’’ indicate dual function pins
TABLE 2-1 Pin Description
Symbol
Driver
Direction
Description
Type
NETWORK INTERFACE PINS
EXT
I
EXTERNAL ENDEC SELECT
Tying this pin to VCC (EXT e 1) disables the internal
ENDEC and allows an external ENDEC to be used Tying this pin to ground (EXT e 0)
enables the internal ENDEC This pin must be tied either to VCC or ground Note the
alternate pin definitions for CRSoCRSi COLoCOLi RXDoRXDi RXCoRXCi and
TXCoTXCi When EXT e 0 the first pin definition is used and when EXT e 1 the second
pin definition is used
AUITP
I
ATTACHMENT UNIT INTERFACE (AUI)TWISTED PAIR (TP) SELECT
Tying this pin
to VCC (AUITP e 1) enables the AUI mode for interface with the ENDEC unit Tying this
pin to GND (AUITP e 0) enables the TPI Module mode for interface with the ENDEC
unit
TXOda TXOa
TPI
O
TWISTED PAIR TRANSMIT OUTPUTS
These high drive CMOS level outputs are
resistively combined external to the chip to produce a differential output signal with
TXOb TXOdb
equalization to compensate for Intersymbol Interference (ISI) on the twisted pair medium
RXIa RXIb
TPI
I
TWISTED PAIR RECEIVE INPUTS
These inputs feed a differential amplifier which
passes valid data to the ENDEC module
TXLED
TP
O
TRANSMIT
An active low output It is asserted for approximately 50 ms whenever the
SONIC-T Controller transmits data in either AUI or TPI modes
RXLED
TP
O
RECEIVE
An active low output It is asserted for approximately 50 ms whenever receive
data is detected in either AUI or TPI mode
COLED
TP
O
COLLISION
An active low output It is asserted for approximately 50 ms whenever the
SONIC-T Controller detects a collision in either AUI or TPI modes
POLED
TP
O
POLARITY
An active low output This signal is normally inactive When the TPI module
detects seven consecutive link pulses or three consecutive received packets with
reversed polarity it is asserted
LINKLED
TP
O
GOOD LINK
An active low output This pin operates as an output to display link integrity
status if this function has not been disabled by the LNKDIS pin described below This
output is off if the SONIC-T Controller is in AUI mode or if link testing is enabled and the
link integrity is bad (ie the twisted pair link has been broken)
This output is on if the SONIC-T Controller is in Twisted Pair Interface (TPI) mode link
integrity checking is enabled and the link integrity is good (ie the twisted pair link has
not been broken) or if the link testing is disabled
LNKDIS
I
LINK DISABLE
When this pin is tied to GND (LNKDIS e 0) the link test pulse
generation and integrity checking function are both disabled
LOWSQL
I
LOW SQUELCH SELECT
Tying this pin to VCC (LOWSQL e 1) sets the squelch mode
to use a squelch threshold level lower than that of the 10BASE-T specification (see
Section 31)
5




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