BCM5248 ? 10/100base-tx octal- ? transceiver 24-port 10/100base-t ethernet switch example ? eight-port 10base-t / 100base-tx / 100base-fx transceiver cable auto-check tm diagnoses and pinpoints cable faults hp auto-mdix automatically uncrosses cable pairs advanced cable diagnostics reduce support calls and lower cost of ownership optimized for use with broadcom's strataswitch tm family cost-effective process technology: 0.18u cmos serial media independent interface (smii) and source synchronous smii (sssmii) fully programmable led drivers and serial led output low power: 200mw per port low voltage core: 1.8v qfp or bga package options most widely deployed and reliable phy architecture: over half a billion digi-phy tm ports shipped smii smii smii bcm5461 gigabit phy bcm5461 gigabit phy BCM5248 octal- BCM5248 octal- BCM5248 octal- quad magnetics quad magnetics quad magnetics quad magnetics quad magnetics quad magnetics target usage: fast ethernet switches. lower power per port: < 2 milliwatts per port. smallest footprint per port available. measures 14 mm x 20 mm for eight ports. single-chip device contains eight independent fast ethernet transceivers. performs all physical layer interface functions for 100base- tx full-duplex or half-duplex ethernet on category 5 unshielded twisted-pair (utp) cable, 10base-t full or half- duplex ethernet on category 3, 4, or 5 utp cable, and 100base-fx full-duplex or half-duplex on fiber optic cable. compliant with ieee 802.3 standard. ieee 1149.1 (jtag) scan chain support. fully customizable led functions. up to 8 led signals per port. features summary of benefits
overview ? phone: 949-450-8700 fax: 949-450-8710 e-mail: info@broadcom.com web: www.broadcom.com broadcom corporation 16215 alton parkway, p.o. box 57013 irvine, california 92619-7013 ? 2004 by broadcom corporation. all rights reserved. 5248-pb00-r 04/16/04 broadcom ? , the pulse logo, and connecting everything ? are trademarks of broadcom corporation and/ or its subsidiaries in the united states and certain other countries. all other trademarks mentioned are the property of their respective owners. the broadcom BCM5248 is a single-chip device containing eight independent fast ethernet transceivers. each performs all the physical layer functions for 100base-tx fu ll- or half-duplex ethernet on category 5 utp cable and 10base-t full- or half-duplex ethernet on category 3, 4, or 5 utp cable. the BCM5248 chip performs encoding and decoding, clock and data recovery, digital adaptive equalization, line transmission, carrier sense and link integrity monitoring, auto- negotiation and smii/sssmii management functions. the BCM5248 is compliant with the ieee 802.3 standard. the BCM5248 offers alternative connection to fiber optic modules for 100base-fx operation. the enhanced fx mode allows 100base-fx operation without the use of signal detect pins. the standard fx mode allows 100base-fx operation with modules that require the phy to use signal detect inputs to disable receive data in the absence of a received optical signal. the BCM5248 can be connected to a switch controller through the smii or sssmii on one side and to the network media on the other side through isolation transformers. the bcm5238 operates from 1.8 and 2.5v/3.3v power supplies; the i/o operates at either 2.5v or 3.3v. the BCM5248 contains an advanced cable diagnostic capability to detect shorts or opens in a utp ca ble, and the distance to the fault, allowing system administrators to quickly determine the source of a fault. additionally, the BCM5248 can detect the length of a good, operating link, which allows mapping of an entire physical cable plant. the BCM5248 includes support for hp auto-mdix, which enables the transceiver to automatically detect and correct miswired cable. with the hp auto-mdix feature, all ports on a switch can be connected to any other 10/100 port on any switch, hub, or network interface card, using crossover or straight-through cables interchangeably. this makes installation, debugging, and maintenance of the network simpler and less expensive to the end user. in addition to two fully programmable led driver pins per port, the BCM5248 also supports a serial led driver output that can be used to drive up to eight leds per port, to indicate the status of link, speed, duplex, transmit or receive activity, or arbitrary functions programmed by the user. the BCM5248 is offered in a 128 pqfp and a 256-ball bga package. mii registers mii management control txd(1:8) ssync sssmii_txc mii to smii sssmii_rxc rxd(1:8) sssmii_rsync sled_d0 led1{1:8} led2{1:8} led_clk mdio mdc multimode xmt dac adc 10base-t pcs 100base-x pcs hp auto- mdix td+/- rd+/- clock generator bias generator jtag tap+bs ref_clk sd+/- bias jtag clock recovery auto- negotiation/ link integrity led controller digital adaptive equalizer txd[3:0] txen txer txc col rxc crs rxdv rxer rxd[3:0] cable auto-check crs/link detection
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