MX98902A

The MX98902A is designed for easy implementation of CSMA/CD local area networks, which include Ethernet(10BASE5), Thin Ethernet (10BASE2), and Twisted-pair Ethernet (10BASE-T). The Media Access Control (MAC) and Encode-Decode (ENDEC) are provided with an AUI interface. The 10BASE-T transceiver functions according to the IEEE 802.3 standards, and the MX98902 10BASE-T transceiver operates in compliance with the IEEE standard.

The MX98902A's functional block consists of the receiver,transmitter, collision, heartbeat, loopback, jabber, and link integrity blocks. When combined with equalization resistors, the transceiver transmits or receives filters, and pulse transformers provide physical interface from the MX98902's ENDEC module and the twisted-pair medium.Manchester encoding and decoding is made possible through the integrated ENDEC module by means of a differential transceiver and phase lock loop decoder at 10 Mbit/sec. Collision detect translator and diagnostic loopback capability are included in this process. Interfacing directly with the transceiver module, the ENDEC module also provides a fully IEEE compliant AUI (Attachment Unit Interface) to connect with other media transceivers.

The Media Access Control function, provided by the Ethernet Network Control (ENC) module, effects an efficient packet transmission and reception control through unique dual DMA channels and an internal FIFO. To lessen board cost and area overheads, bus arbitration and memory control logic are integrated.

Designed for easy interface with other transceivers by means of the AUI interface, the MX98902A provides a thorough single chip solution for 10BASE-T IEEE 802.3 network.

Constraints of CMOS processing require that isolation,whether capacitive or inductive, be used at the AUI differential signal interface for 10BASE5 and 10BASE2 applications.