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DP83953 データシート

部品番号コンポーネント説明メーカー
DP83953 Repeater Interface Controller with Security Features, Internal Drivers and Integrated Filters National-Semiconductor
National ->Texas Instruments National-Semiconductor
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General Description
The DP83953 Repeater Interface Controller with Security Features and Integrated Transmit Filters (RIC2A) is an enhanced version of the DP83952 Repeater Interface Control ler with Security Features (RIC II). The RIC2A integrates driver and filter circuitry into the RIC II design.
The functionality of the RIC2A is essentially similar to the RIC II, but the pin definitions have been modified to reflect the added integrated drivers and filters. Additionally, the power and ground pin locations have been rearranged. Therefore, the RIC2A is not a drop in replacement for the RIC ll.

Features
■ Fully compliant with the IEEE 802.3 Repeater Specification
■ 12 IEEE 802.3 10BASE-T compatible ports with built-in drivers and analog transmit filters; additional external isolation transformers are required to implement hubs
■ 1 IEEE 802.3 compatible AUI port
■ Cascadable for larger hub applications
■ On chip Elasticity Buffer, Manchester encoder and decoder
■ Separate Partition state machines for each port
■ Compatible with 802.3k Hub Management requirements
■ LED displays to provide port status information, includ ing receive, collision, partition, jabber and link status,
■ Power-up configuration options
■ Repeater and Partition Specifications, Status Display, Processor Operations
■ Simple processor interface for repeater management and port disable.
■ On-chip Event Counters and Event Flag Arrays
■ Serial Management Bus Interface to combine packet and repeater status information
■ Single 5V supply

The Security Features
■ Prevents unauthorized eavesdropping and/or intrusion on a per port basis
■ 58 On Chip CAMs (Content Addressable Memory) allow storage of acceptable addresses
■ Learn mode automatically records addresses of attached node

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