DM9081FP product brief 10base-t hub controller may 2008 rev.1.0 the 10base-t hub controller (dm9081) provides a system level solution for designing ieee-compliant 802.3 repeaters that incor porate 10base-t transceivers. this device integrates the repeater functions specified by section 9 of the ieee 802.3 standard. the twisted pair transceiver is compliant with 10base-t standards. the dm9081 provides eight integral twisted pair media attachment units (maus) and two attachment unit interface (aui) ports in a 100-pin qfp package. the total number of ports per repeater unit can be increased by connecting multiple dm9081 chips via their expansion ports. the dm9081 sup ports led drivers to monitor port status. it displays link, carrier sense, collision, par tition, and bit rate error status. in minimum mode, link, carrier sense, and collision stat us can be displayed without external ttl devices. block diagram tx mux preamble jam signal fifo manchester decoder rx mux aui port1 aui port2 tp port0 tp port7 pll manchester encoder * * * * * data in data out mux state machine timer led port2 led port1 expansion port nrz data expin# expout# dat rxp1 rxn1 cdp1 cdn1 txp1 txn1 rxp2 rxn2 cdp2 cdn2 txp2 txn2 rxd0+ rxd0- tpo0+ dtpo0+ dtpo0- tpo0- rxd7+ rxd7- tpo7+ dtpo7+ dtpo7- tpo7- aui1_crs_led aui2_crs_led col_led aui_led tp_bit_led tp_pol_led tp_jab_led traffic_led tp_par_led tp_link_led tck led_latch rx_clk
specifications repeater functions comply with ieee 802.3 repeater unit specification eight integral 10base-t transceiver s utilize the required pre-distortion transmission technique two attachment unit interface (aui ) ports allow connection with 10base5 (ethernet) and 10base2 (cheapernet) networks design a dumb hub in minimum mode by using minimum external logic that can respond to link, carrier se nse and collision status from led supports one led output per port for additional status indicators such as link, partition, carrier sense, etc. built-in jabber led reports global jabber information of the dm9081 hub built-in traffic led indicates hub gl obal 10mhz bandwidth utilization status expandable to accommodate two dm 9081 connections, with no external logic required on board pll, manchester encoder/decoder and fifo expandable to accommodate increas ed number of repeater ports. recommended ic cascade number: under 3 and inclusive preamble loss effects e liminated by deep fifo each port can be isolated (partitioned) and reconnected separately twisted pair link test capability full amplitude and timing regenerat ion for retransmitted signals low power cmos process with singl e 5v supply, 100-pin qfp package application voip cpe (ata, ip phone, video phone) ip stb, ipc, internet radio ordering information part number pin count package dm9081f 100 qfp DM9081FP 100 qfp (pb-free) davicom semiconductor, inc. no.6, li-hsin rd.vi, science pa rk, hsin-chu, taiwan, r.o.c. tel: 886-3-5798797 fax: 886-3-5646929 e-mail: sales@davicom.com.tw
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