brief bcm3252 ? dual-channel front-end docsis ? 2.0+ stb ic with channel bonding basic interactive docsis 2.0+/dsg hd set-top box block diagram ? dual qam in-band demodulators ? out-of-band (oob) demodulator for support of dvs-178 and dvs-167 ? 800dmips dual-threaded r4k mips processor ? docsis ? /eurodocsis? 2.0+ including dsg and channel bonding ? docsis and channel bonding code supplied by broadcom ? ? davic mac ? usb 2.0 mac and phy (full data rate usb supported) ? pci ? boot from unified back-end flash (i.e., flash connected to bcm7038, bcm7400, bcm7401, or BCM7402) ? ethernet mac and phy ? bom savings include integrated regulators, vcx0, and upstream amplifier ? ipv6 supported ? the bcm3252 provides a complete front-end solution for next- generation set-top box products. north america and international markets enable a single design to be deployed on a worldwide basis. ? able to support ip video data rates at up to 80 mbps, allowing for future transition to an all ip network. ? software switchable from broadcast (video channel configuration) to channel bonding, enabling in field-network configuration transitions. ? high-performance processor capable of supporting docsis/ eurodocsis 2.0+, channel bonding, and other network- centric applications. ? oob provides support for existing oob channels that are used today. facilitates move to dsg and docsis. ? usb 2.0, pci, and ethernet make for flexibility in connection to back-end devices, bcm7038, bcm7400, bcm7401, and BCM7402. ? bom savings resulting from integration enable lower overall set-top box cost. ? broadcom-supplied code for channel bonding and docsis enables quick time-to-market. features summary of benefits ddr sdram 8 mb rf out pci audio out rf mode ts in ts in mii hdmi/dvi out flash 32mx8 sec. up/ca ir & uhf i/f cable power bcm3420 stereo audio out moca homeplug av ieee 802.11g,n s/pdif out s/pdif out ntsc/ video video out ypbpr out comp. video hdmi out dual usb 2.0 usb 2.0 (opt.) 1394 mac/phy opt. firewire ddr sdram 200 mhz 256 mb x64 opencable ? cablecard ? optional diplexer bcm3252 docsis ? 2.0+ 800dmips bcm3420 BCM7402 hd avc vc-1
overview ? phone: 949-926-5000 fax: 949-926-5203 e-mail: info@broadcom.com web: www.broadcom.com broadcom corporation 5300 california avenue irvine, california 92617 ? 2007 by broadcom corporation. all rights reserved. 3252-pb02-r 12/05/07 broadcom ? , the pulse logo, connecting everything ? , and the connecting everything logo are among the trademarks of broadcom corporation and/or its affiliates in the united states, certain other countries and/or the eu. any other trademarks or trade names mentioned are the property of their respective owners. bcm3252 block diagram broadcom?s ics provide the solution for the next-generation interactive docsis 2.0+, dsg hd avc set-top box. the main sections include a front end (tuners, qam, and docsis), addressed by the bcm3420 and bcm3252, and a back end (hd avc/vc-1/mpeg2 decoding, audio decode, hdmi, and peripherals, etc.), addressed by the BCM7402. the bcm3252 ip video pipeline ic provides the integrated front-end solution for high-end set-top boxes. it has a high-performance processor that can address the tasks of docsis 2.0+, channel-bonding resequencing, and network protocols such as tcpip, upnp, and ipv6. the bcm3252 is both docsis- and eurodocsis-certified. the oob and upstream modulator of the bcm3252 conforms to the dvs-167, dvs-178, and docsis standards. the gpio on the bcm3252 can be configured to output cablecard ? signals, which connect directly to the cablecard socket. the bcm3252 supports both the individual program channel mode (up to two video channels) and the channel-bonded mode (up to two docsis channels). these modes can be switched from one to the other via software, making the bcm3252 ideal for networks that will move to channel bonding in the future. broadcom?s latest cmos tuner, the bcm3420, addresses the low power needs of set-top boxes and extends the range of tuning up to 930 mhz. the BCM7402 is a single hd avc/vc-1/mpeg2 decoder with graphics subsystem. it contains a mips32 ? processor dedicated to applications and os. included in the BCM7402 are integrated video amps, mac and phys for usb 2.0, usb 1.1, 10/100 ethernet, flexible audio core supporting today's major audio codecs, and other next- generation set-top box features. the bcm3252/BCM7402 systems also support a single unified flash for reduced component bom and systems cost savings. a full 80-mbps ip video stream is supported in channel bonding mode in the bcm3252/BCM7402 set-top. the bcm3252 and bcm3420, along with the BCM7402, provide the solution for the next-generation basic interactive docsis 2.0+/dsg hd avc set-top box products, meeting the requirements for us cable operators and international operators alike. the bcm3252 is in volume production today. 1.2v vreg 2g power dac array us out video qam in if in 2.5v vreg modulator qpsk- 256 qam mpeg out clock generation tx conv module starvue davic mac fpm with 32-kb sram 16-kb to 32-kb ti icache 300-mhz 4350-cmt mips core dual-threaded mmu + dual mac ubus biu ubus arbiter 133-mhz 16-bit ddr controller 133-mhz 16-bit ddr (ddr266) 16 kb dcache test mux periph logic ethernet mac ethernet phy ieee 802.3u spi usb 2.0 mpi pci/ebi pci/ebi usb 2.0 docsis qam in demodulator 16?1024qam 16-kb boot rom docsis 2.0+ mac with channel bonding out-of-band demodulator demodulator 16?1024 qam 500-mhz rbus 133-mhz ubus serial flash isolation 27-mhz xtal pnp pnp
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