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PDF DP83953 Data sheet ( Hoja de datos )
| Número de pieza | DP83953 | |
| Descripción | Repeater Interface Controller | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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PRELIMINARY
March 1998
DP83953 (RIC2A)
Repeater Interface Controller with Security Features,
Internal Drivers and Integrated Filters
General Description
T 1 IEEE 802.3 compatible AUI port
TThe DP83953 Repeater Interface Controller with Security Cascadable for larger hub applications
TFeatures and Integrated Transmit Filters (RIC2A) is an en- On chip Elasticity Buffer, Manchester encoder and de-
hanced version of the DP83952 Repeater Interface Control- coder
Tler with Security Features (RIC II). The RIC2A integrates Separate Partition state machines for each port
driver and filter circuitry into the RIC II design.
T Compatible with 802.3k Hub Management require-
The functionality of the RIC2A is essentially similar to the ments
TRIC II, but the pin definitions have been modified to reflect LED displays to provide port status information, includ-
the added integrated drivers and filters. Additionally, the ing receive, collision, partition, jabber and link status,
Tpower and ground pin locations have been rearranged. Power-up configuration options
TTherefore, the RIC2A is not a drop in replacement for the Repeater and Partition Specifications, Status Display,
RIC ll.
Processor Operations
TThe RIC2A is National Semiconductor’s managed repeater Simple processor interface for repeater management
solution designed to comply with IEEE 802.3 Repeater and port disable.
TSpecifications. Segment partition and jabber lockup protec- On-chip Event Counters and Event Flag Arrays
Ttion state machines are implemented in accordance with Serial Management Bus Interface to combine packet
this standard. The RIC2A has thirteen network interface and repeater status information
Tports available, including an AUI compatible port. The AUI Single 5V supply
port incorporates drivers to connect an external MAU using
maximum length cable. Similarly, the other twelvDe ainttaeSrfhaceeet4U.com
ports integrate 10BASE-T transceivers with supporting driv- The Security Features
er and transmit filter circuitry. (continued)
T Prevents unauthorized eavesdropping and/or intrusion
Features
T Fully compliant with the IEEE 802.3 Repeater Specifica-
tion
T 12 IEEE 802.3 10BASE-T compatible ports with built-in
drivers and analog transmit filters; additional external
on a per port basis
T 58 On Chip CAMs (Content Addressable Memory) al-
low storage of acceptable addresses
T Learn mode automatically records addresses of at-
tached node
isolation transformers are required to implement hubs
DataShee
System Diagram
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© 1998 National Semiconductor Corporation
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2.0 Pin Descriptions
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Pin Name
Pin No.
Driver
Type
I/O
Description
Network Interface Pins
RXI2- to RXI13-
TP I Twisted Pair Receive Input Negative
RXI2+ to RXI13+
TP I Twisted Pair Receive Input Positive
TXO2- to TXO13-
TP O Twisted Pair Transmit Output Negative
TXO2+ to TXO13+
TP O Twisted Pair Transmit Output Positive
FILTTL
153 TT
I FILter/TTL: This pin can be utilized for the PCB diagnostic pur-
poses.
0: Normal repeater operation
1: Differential transmit signals change to TTL level +TX and de-
layed +TX.
REQ
4 Analog I Equalization Resistor: A resistor connected between this pin and
GND or VDD adjusts the equalization step amplitude on the
Manchester encoded transmit data. Care must be taken to ensure
system timing integrity when using cable lengths greater than
100m. The value here is dependent upon board layout.
RTX
5 Analog I Extended Cable Resistor: A resistor connected between this pin
and GND or VDD adjusts the amplitude of the differential transmit
outputs. Care must be taken to ensure system timing integrity
when using cable lengths greater than 100m. The value here is
dependent upon board layout.
AUI Port
CD1+
111 AL
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I AUI Collision Detect Input Positive
CD1-
112 AL
I AUI Collision Detect Input Negative
RX1+
113 AL
I AUI Receive Input Positive
RX1-
114 AL
I AUI Receive Input Negative
TX1+
109 AD
O AUI Transmit Output Positive
TX1-
110 AD
O AUI Transmit Output Negative
TP = Twisted Pair interface compatible, TT = TTL compatible, I = Input, O = Output, Analog = current dependent effect,
AL = AUI Level, AD = AUI Drive
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3.0 Block Diagrams (Continued)
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Figure 2. RIC2A Port Architecture Security Block Diagram
Note: The block diagram for the RIC2A, when used in the non-secure mode, is identical to the “shared” repeater functional block diagram.(Figure 1). But,
in secure mode, additional security logic is used when operating the device (Figure 2)
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet DP83953.PDF ] | |
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