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| BCM3214 PRODUCT (R) Brief OF BENEFITS BCM3214 DOCSIS 2.0 ADVANCED CMTS MAC BCM3214 FEATURES SUMMARY * Performs DOCSIS including: TM 2.0 MAC layer functions, Hardware support * functions includingfor MAC-layer per-packet and fragmentation, concatenation, one downstream * Supports simultaneously and up to six upstream channels * Many other downstream-to-upstream ratios can be achieved by connecting multiple BCM3214s via the seamless MAP master/slave interface * Fragment reassembly and deconcatenation * Logical channels * Payload header suppression and expansion * 56-bit DES encryption and decryption * Generation and checking of HCS and CRC * MPEG encapsulation of downstream traffic * Timestamp and SYNC message generation * * * High, medium, and low priority downstream queues payload header suppression offloads system CPU, giving higher overall system performance Extraction of bandwidth requests and DOCSIS MAC management messages allows software to access these messages without examining data packets Class-based queuing allows traffic prioritization: * High priority, low priority, request, and MAC management upstream queues Processes 400 000 packets the * aggregate up toall upstream andper second in channels over downstream * *Direct interface to: DOCSIS 2.0 Advanced QAM BCM3040 QAMLink (R) TM Packet * to otherport provides a high-throughput data interface network equipment via the standard IEEE modulator (providing downstream data rates up to 100 Mbps) * BCM3140 QAMLink(R) dual-channel DOCSIS 2.0 burst receiver (providing upstream data rates up to 40 Mbps per upstream channel) Support for carrier class redundancy via timestamp * synchronization across multiple BCM3214 devices Supports high rates for * available cablepacketbandwidthmaximum utilization of plant Out-of-band (OOB) generator * BCM3352-based cable modemsfor messaging to Can be remoted from routing/classification * engine for distributed external(mini fiber node) CMTS * * 802.3z GMII Ethernet interface PCI interface to external host CPU supports either 32bit or 64-bit operation at either 33 MHz or 66 MHz PROPANETM packet acceleration and Smart SpectrumTM technologies for increased upstream performance * * * applications SPI Master Port Controls register interface to BCM3040 and BCM3140 devices Packaged in an 841-pin, thermally-enhanced plastic ball grid array Operates over industrial temperature range (-40 to +85C) PCI bus Typical Application Block Diagram Upstream Analog Inputs BCM3140 Dual Adv. TDMA Receiver Upstream SDRAM (keys and reassembly) Upstream SDRAM (PHS, output queues) BCM3140 BCM3140 Ethernet Routing/ Classification Engine WAN BCM3214 Advanced CMTS MAC System CPU PCI Bus Downstream Analog Inputs BCM3034 Downstream Modulator Downstream SDRAM (PHS, output queues) Memory BCM3214 OVERVIEW BCM3214 Block Diagram US SDRAM 0 US SDRAM 1 us_shared key lookup and UGS compare SDRAM ctrl 0 /Free Pool 0/ Per-SID MIBs Request queue DMA UBus 0 -> UBus 1 bridge SDRAM ctrl 1 /Free Pool 1/ Per-SID MIBs Pkt Port Egress / Queue Manager us_pre with multiple logical channel support BCM3140 Data i/f PHY i/f DES decryption Header proc. Burst DMA Upstream Post Processor with multiple logical channel support UBus 0 Header parse FFT DMA Bypass DMA PHS and PropaneTM Packet DMA UBus 1 Packet Port Ingress 100/1000 Ethernet MAC GMII i/f BCM3140 FFT i/f 0 bridge UBus 2 -> UBus DOCSIS 2.0 Upstream PHY MAP interface with multiple logical channel support Fragment reassembly control PCI Egress/ Queue Manager 1 bridge UBus 2 -> UBus BCM3140 MAP i/f SPI i/f to PHYs MAP mstr i/f MAP slave i/f misc clock/ GPIO/ SPI misc PCI_top PCI target bridge PCI BIU MAP extract/ parse UBus 2 Out-ofBand PHY i/f Timestamp Generation Out-ofBand Generator ds_top Downstream Processor MPEG encaps MPEG video input DES Header creator PHS In-Band packet/ key/rule DMA PCI Ingress SDRAM ctrl 2 /Free Pool 2/ Per-flow MIBs PCI DMA PCI i/f BCM3040 OOB i/f BCM3040 in-band i/f Downstream PHY i/f MPEG video source (in MPEG slave mode only) DS SDRAM The BCM3214 is a highly integrated CMTS MAC integrated circuit for use in DOCSIS 2.0 and advanced TDMA PHY-layer CMTS products. With hardware support for concatenation parsing, fragment reassembly, payload header suppression, and advanced TDMA physical layer data rates, the BCM3214 serves as the heart of a next-generation CMTS. The BCM3214 provides a powerful, yet cost-effective solution for a variety of CMTS architectures. The BCM3214 is based on sophisticated hardware processing engines for both the upstream and downstream paths. To achieve upstream throughput of 200 000 packets per second, the upstream processor design is segmented and uses 2 banks of SDRAM to minimize latency on the internal buses. The upstream processor performs DES decryption, fragment reassembly, deconcatenation, payload header expansion, PROPANETM packet acceleration, upstream MIB statistic gathering, and priority queuing for the resultant packets. Each upstream queue can be independently configured to output packets to either the PCI or GMII interface. DOCSIS MAC management messages and bandwidth requests are extracted and queued separately from data packets so that they are readily available to the system controller. The downstream processor accepts packets from priority queues and performs payload header suppression, DOCSIS header creation, DES encryption, CRC and HCS generation, MPEG encapsulation and multiplexing, and timestamp generation on the in-band data. The BCM3214 also includes an out-of-band generator and TDMA PHY-layer interface so that the BCM3214 can communicate with the out-of-band receiver of the BCM3352 cable modem device for control of power management functions. All configuration and management of the BCM3214 is done via the PCI interface. The PCI interface accommodates either 32-bit or 64-bit hosts operating at either 33 MHz or 66 MHz. The 100/1000 Ethernet MAC provides a standard interface (IEEE 802.3z GMII or MII) for transporting packets to and from the BCM3214. A single BCM3214 supports the association of 1 downstream channel with up to 6 upstream channels. By connecting multiple BCM3214 chips via the seamless master/slave interface, many other ratios may be achieved, including 2 downstream to 12 upstream (2:12) and 1 downstream to 24 upstream (1:24). In multiple downstream configurations, upstream channels can be remotely provisioned to be associated with 1 of 2 downstream channels to enable load shifting. Broadcom(R), the pulse logo, QAMLink(R), PROPANETM ,and Connecting everything(R) are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. All other trademarks are the property of their respective owners. (R) BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 (c) 2002 by BROADCOM CORPORATION. All rights reserved. 3214-PB01-R 11.18.02 Phone: 949-450-8700 FAX: 949-450-8710 Email: info@broadcom.com Web: www.broadcom.com |
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