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DP83950B Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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DP83950B Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 80 page  TLF11096 October 1995 DP83950B RIC TM Repeater Interface Controller General Description The DP83950B Repeater Interface Controller ‘‘RIC’’ may be used to implement an IEEE 8023 multiport repeater unit It fully satisfies the IEEE 8023 repeater specification including the functions defined by the repeater segment partition and jabber lockup protection state machines The RIC has an on-chip phase-locked-loop (PLL) for Man- chester data decoding a Manchester encoder and an Elas- ticity Buffer for preamble regeneration Each RIC can connect to 13 cable segments via its network interface ports One port is fully AUI compatible and is able to connect to an external MAU using the maximum length of AUI cable The other 12 ports have integrated 10BASE-T transceivers These transceiver functions may be bypassed so that the RIC may be used with external transceivers for example DP8392 coaxial transceivers In addition large re- peater units containing several hundred ports may be con- structed by cascading RICs together over an Inter-RIC bus The RIC is configurable for specific applications It provides port status information for LED array displays and a simple interface for system processors The RIC posseses multi- function counter and status flag arrays to facilitate network statistics gathering A serial interface known as the Man- agement Interface is available for the collection of data in Managed Hub applications Features Y Compliant with the IEEE 8023 Repeater Specification Y 13 network connections (ports) per chip Y Selectable on-chip twisted-pair transceivers Y Cascadable for large hub applications Y Compatible with AUI compliant transceivers Y On-chip Elasticity Buffer Manchester encoder and de- coder Y Separate partition state machines for each port Y Provides port status information for LED displays in- cluding receive collision partition and link status Y Power-up configuration options Repeater and Partition Specifications Transceiver Inter- face Status Display Processor Operations Y Simple processor interface for repeater management and port disable Y On-chip Event Counters and Event Flag Arrays Y Serial Management Interface to combine packet and repeater status information together Y CMOS process for low power dissipation Y Single 5V supply Table of Contents 10 SYSTEM DIAGRAM 20 CONNECTION DIAGRAM 30 PIN DESCRIPTIONS 40 BLOCK DIAGRAM 50 FUNCTIONAL DESCRIPTION 60 HUB MANAGEMENT SUPPORT 70 PORT LOGIC FUNCTIONS 80 RIC REGISTER DESCRIPTIONS 90 AC AND DC SPECIFICATIONS 100 AC TIMING TEST CONDITIONS 110 PHYSICAL DIMENSIONS 10 System Diagram Simple RIC Hub TLF11096 – 1 TRI-STATE is a registered trademark of National Semiconductor Corporation RICTM and SONICTM are trademarks of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M16Printed in U S A |
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