ML4644

April 1997 ML4644* 4 Port AUI Multiplexer GENERAL DESCRIPTION The ML4644 AUI Multiplexer contains all the necessary drivers/receivers and control logic to implement a 4 port MAU when used in conjuction with a transceiver chip which has a standard 802.3 AUI interface. Several ML4644s can be cascaded together to implement an 8 or 12 port MAU or standalone device. Logic within the ML4644 detects collisions resulting from multiple DTEs transmitting simultaneously. In addition, collision signals received from a transceiver attached at the MAU port are propagated to all of the DTE ports. Jabbering DTEs are prevented from loading down the network by an internal jabber timer which disables babbling ports. FEATURES s IEEE 802.3 compliant AUI interfaces assure compatibility with any AUI ready devices. On-chip Jabber logic, Collision Detection, and SQE test with enable/disable option. Selectable SQE Test Selectable loopback Ten network status LED outputs. s s s s * This Part Is End Of Life As Of August 1, 2000 BLOCK DIAGRAM 67 55 56 21 20 54 53 64 10 7 24 23 2 1 31 12 11 34 33 5 4 32 46 47 37 36 59 58 44 66 61 17 25 TxIN1N TxIN1P RxOUT1N RxOUT1P CDOUT1N CDOUT1P SQEN1 TxIN2N TxIN2P RxOUT2N RxOUT2P CDOUT2N CDOUT2P SQEN2 TxIN3N TxIN3P RxOUT3N RxOUT3P CDOUT3N CDOUT3P SQEN3 TxIN4N TxIN4P RxOUT4N RxOUT4P CDOUT4N CDOUT4P SQEN4 22 3 51 X2 X1 MAU AUI INTERFACE X3 RRESET BIASING VCC 26 VCC OSCILLATOR MAU AUI INTERFACE TxOUTP TxOUTN MUX DTE AUI INTERFACE RxINP RxINN CDINP CDINN 15 ...