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ML4642 Datasheet(PDF) 1 Page - Micro Linear Corporation |
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ML4642 Datasheet(HTML) 1 Page - Micro Linear Corporation |
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1 / 15 page  April 1997 ML4642 AUI Multiplexer GENERAL DESCRIPTION The ML4642 AUI Multiplexer contains all the necessary drivers/receivers and control logic to implement a 2 port MAU when used in conjuction with a transceiver chip which has a standard 802.3 AUI interface. In addition, the ML4642 is capable of operating in stand-alone mode where it interconnects two DTEs in the absence of a network MAU. Several ML4642s can be cascaded together to implement a 4 or 8 port MAU or stand-alone device. Logic within the ML4642 detects collisions resulting from multiple DTEs transmitting simultaneously. In addition, collision signals received from a transceiver attached at the MAU port are propagated to both of the DTE ports. Jabbering DTEs are prevented from loading down the network by internal jabber timers which disable babbling ports. FEATURES s IEEE 802.3 compliant AUI interfaces assure compatibility with any AUI ready devices s No crystal or clock input s On-chip Jabber logic, Collision Detection, and SQE test with enable/disable option s Selectable Loopback, Jabber, and SQE Test allows cascading of multiple chips to increase DTE port BLOCK DIAGRAM 1 VCC VCC GND DTE AUI INTERFACE MAU AUI INTERFACE CONTROL LOGIC JABBER DI MUX CI MUX SQE SOURCE LED DRIVERS +5V 61.9K RRSET TXOUTP TXOUTN RXINP RXINN CDINP CDINN JAB1/JDIS JAB2 CDLED RXLED/LPBK/SQE TXLED1 TXLED2 MAU AUI INTERFACE TXIN1P TXIN1N RXOUT1P RXOUT1N CDOUT1P CDOUT1N TXIN2P TXIN2N RXOUT2P RXOUT2N CDOUT2P CDOUT2N DO MUX |
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