DP83953 Datasheet | National Semiconductor

Features , Internal Drivers and Integrated Filters PRELIMINARY March 1998 DP83953 (RIC2A) Repeater Interface Controller with Security Features , Internal Drivers and Integrated Filters General Description The DP83953 Repeater Interface Controller with Security Features and Integrated Transmit Filters (RIC2A) is an enhanced version of the DP83952 Repeater Interface Controller 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. T T T T T T T T The RIC2A is National Semiconductor’s managed repeater T solution designed to ply with IEEE 802.3 Repeater Specifications. Segment partition and jabber lockup protec- T tion state machines are implemented in accordance with T this standard. The RIC2A has thirteen network interface ports available, including an AUI patible port. The AUI T port incorporates drivers to connect an external MAU using . maximum length cable. Similarly, the other twelve interface ports integrate 10BASE-T transceivers with supporting driv- The Security Features er and transmit filter circuitry. (continued) T Prevents unauthorized eavesdropping and/or intrusion on a per port basis Features T 58 On Chip CAMs (Content Addressable Memory) al T Fully pliant with the IEEE 802.3 Repeater Specificalow storage of acceptable addresses tion T Learn mode automatically records addresses of at T 12 IEEE 802.3 10BASE-T patible ports with built-in tached node drivers and analog transmit filters; additional external isolation transformers are required to implement hubs 1 IEEE 802.3 patible AUI port Cascadable for larger hub applications On chip Elasticity Buffer, Manchester encoder and decoder Separate Partition state...