functional description: the AC108SU is a highly integrated, low power, eight port 10/100tx/fx ethernet switch. all ports are configurable to 10 base-t / 100 base-tx or 100 base-fx. store and forward algorithms are used to route packets at line speed in a non-blocking manner. buffering and address tables are stored in external sdram / sgram, up to 4mbytes. a 4.8gbps back- plane interface allows 3 AC108SUs to be cascaded together for 24 ports of line speed switching. on chip filtering and wave shaping eliminate the need for external hybrid filters. silicon solutions empowering the net 2055 gateway parkway suite 700 san jose, ca95110 (408) 453-3700 (www.altimacom.com) ac108 su ac108 su octal ultra low power 10/100 ethernet switch january 20, 2000 customer / application: l high density, low cost switch available collateral: l AC108SU data sheet l v erilog and spice models l demo boards & schematics compelling evidence: the AC108SU with external sdram/sgram provides all of the required features of an eight port 10/100tx/fx ethernet switch. the AC108SU has the smallest footprint and the lowest power consumption, on a per port basis, of any 8/16/24 port switch solution. when all system costs are considered; power, heat, components and real estate, the AC108SU will provide the lowest overall system cost and most reliable design. availability: samples: q1/00 production: q2/00 features: l 8 - 10 base-t / 100 base-tx / 100 base-fx ports l full duplex or half duplex l flow control l fefi on 100fx l v ery small package - 272pbga l 729 sq. mm footprint l v ery low power - typ < 3w l selectable tx drivers for 1:1 or 1.25:1 transformers enable additional power reduction l cable detect mode - typ < 1.4w l fully compliant with ieee 802.3 / 802.3u l scaleable to 24 line-speed ports - 148,800 pps l 4.8gbps nucleus ( back-plane interface l unique, per port, scrambler seed for reduced emissions l baseline wander compensation l highly efficient led outputs l reverse polarity detection and correction l store and forward bridging algorithm
ac108 su w ith three different physical media interfaces and a 4.8gbps cascade bus the AC108SU ultra low power switch is the most comprehensive silicon solution for the ultra low cost 10/100 switch market. one AC108SU, a bank of sdram and a serial eeprom are all that are needed to design a complete 10/100 non-blocking 8-port switch. 2055 gateway parkway suite 700, san jose, ca 95110 (408) 453-3700 www.altimacom.com altima communications inc. reserves the right to make changes to this document without notice. all the major components needed for a typical 24 port, unmanaged, switch are: l 3-AC108SU l a serial configuration eeprom l a single bank of sdram or sgram. power consumption, real estate and cost are all kept to a minimum. for the physical media connectivity, support is provided for: l 10base-t - as either forced, parallel detected or negotiated 10mbps -half / full duplex l 100base-tx - as either forced, parallel detected or negotiated 100mbps - half / full duplex l 100base fx - forced 100mbps - half / full duplex t ypical implementation of 10 base-tor 10/100 tx physical layer connections. please refer to the latest documentation to determine correct component values. t ypical implementation of 10 base-tor 10/100 tx physical layer connections. please refer to the latest documentation to determine correct component values. sgram sgram /sdram sgram /sdram sgram /sdram
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