DP83251 DP83255 PLAYER Device (FDDI Physical Layer Controller)
February 1991
DP83251 55 PLAYER
TM
Device
(FDDI Physical Layer Controller)
General Description
The DP83251 DP83255 PLAYER device implements one
Physical Layer (PHY) entity as defined by the Fiber Distribut-
ed Data Interface (FDDI) ANSI X3T9 5 Standard The PLAY-
ER device contains NRZ NRZI and 4B 5B encoders and
decoders serializer deserializer framing logic elasticity
buffer line state detector generator link error detector re-
peat filter smoother and configuration switch
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Low power CMOS-BIPOLAR process
Single 5V supply
Full duplex operation
Separate management interface (Control Bus)
Parity on PHY-MAC Interface and Control Bus Interface
On-chip configuration switch
Internal and external loopback
DP83251 for single attach stations
DP83255 for dual attach stations
TL F 10386 鈥?1
FIGURE 1-1 FDDI Chip Set Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
BSI
TM
BMAC
TM
PLAYER
TM
CDD
TM
and CRD
TM
are trademarks of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 10386
RRD-B30M105 Printed in U S A