Broadband Modems Cable Modems Single-Chip Cable Modem Solution DOCSIS 2.0-Based ™ CX24951 Conexant’s next generation cable modem solution offers a DOCSIS 2.0-based single-chip modem while providing dual software programmable network processing engines Conexant’s broadband communications portfolio includes a comprehensive suite of semiconductor solutions that enable the digital home and information network. The InfoSurge™ family of products, supporting broadband cable modem applications, presents the industry with yet another example of Conexant’s ability to exceed the needs of a growing market segment. The CX24951, Conexant’s DOCSIS 2.0-based single-chip cable modem solution, provides backwards compatibility with the DOCSIS 1.1 and the DOCSIS 1.0 standards. The world’s fastest, lowest power and smallest cable modem solution, the CX24951, offers 500 MIPS of processing power while consuming just 550mW in a 17mm x 17mm BGA package. The CX24951 fully supports the new upstream physical-layer modulation technologies A-TDMA (Advanced Time Division Multiple Access) and S-CDMA (Synchronous Code Division Multiple Access) as specified in DOCSIS 2.0 standard. These new modulation techniques significantly increase upstream cable bandwidth for data transmissions (up to 30Mbps) without requiring CX24951 Distinguishing Features • A-TDMA and S-CDMA DOCSIS 2.0 upstream modulation • High level of integration (Single monolithic IC) any physical rebuilding of cable networks. • Dual software programmable network processing engines The CX24951’s 500 MIPS and software programmable dual processor architecture • 500 MIPS of processing power with on-chip memory for cable MAC and application layer processing makes • Less than 550mW typical power dissipation it ideally suited for CableHome™ and PacketCable™ applications. Dual Programmable Network Processors The CX24951 utilizes the proven software programmable dual processor architecture of its predecessor, the CX24943, and further boosts its performance by increasing the instruction memory size to 128K bytes. The CX24951 is pin compatible with the CX24943. The dual network processing engine architecture offers real-time-critical packet management processing and superior performance. The software programmability of this architecture accommodates application specific • Embedded IEEE 802.3 MAC with MII • 12Mb USB 1.1 communications transceiver • Support for DOCSIS/EuroDOCSIS 2.0/ 1.1/1.0, DVB and proprietary standards • CableHome and PacketCable compliant • High density, 17mm x 17mm BGA package requirements, worldwide standards, and manufacturers’ unique value added features for maximum flexibility. Part Number CX24951 Description Single-Chip Cable Modem Broadband Modems Cable Modems The dual processor architecture of the CX24951 allows it to be Highly Integrated used in CableHome applications, without needing an additional The CX24951 supports a number of interfaces including a USB 1.1 network processor for the firewall and routing features required communications transceiver, an IEEE 802.3 10/100 Ethernet Media by the CableHome standard. The firewall and routing algorithms Access Controller (MAC) with a Media Independent Interface (MII) required by CableHome take less than 10 percent of the 500 MIPS for access to home networking standards. Examples are HPNA processing power of the CX24951, leaving plenty of processing 2.0, HomePlug 1.0 and a host interface which supports seamless power left for developing custom networking applications. connectivity to any PCMCIA compliance device such as IEEE 802.11a and IEEE 802.11b wireless transceivers. The CX24951 The integrated MII port and the PCMCIA functionality of the supports integrated and stand alone cable modems, home integrated host port allow the CX24951 to provide a seamless networking gateway products, IP (Internet Protocol) telephony interface to an array of networking peripherals such as wireless products, and digital set-top boxes. LANs (802.11a/b), HomePlug transceivers, HPNA solutions, and The CX24951 was developed using leading-edge process and multi-port Ethernet Switches. packaging technologies. This helps drive down the size of the The CX24951 also supports PacketCable applications by monolithic IC, package and power, while allowing clock rates interfacing to Conexant’s voice DSP products to execute voice to increase. The CX24951 dissipates less than 550mW of power processing algorithms. setting a new standard for the industry. The CX24951, through its high level of integration, enables manufacturers to develop a complete cable modem with a minimal number of additional components as shown in the CX24951-based cable modem block diagram. LED Indicators Cable Tuner GPIO ADC MII DAC Control CX24951 4 MB SDRAM SDRAM Interface 10/100 Ethernet PHY RJ-45 Conexant HPNA 2.0 PHY RJ-11 Conexant HomePlug PHY Powerline Type B Socket USB Host Interface Conexant Voice DSP 1.3v Power Supply 3.3v 5.0v 2 MB Flash 802.11a/b MAC/PHY CX24951-based Cable Modem Block Diagram RJ-11 RJ-11 Antenna CX24951 Features Increased Performance Conexant’s seventh-generation physical-layer downstream receiver includes a 10-bit A/D that accepts a direct IF signal Flexible Platform (at 44 or 36 MHz) and a QPSK/16/32/64/128/256 QAM Cable modem manufacturers have to devote a significant demodulator with Annex A, B and C forward error correction. amount of resources to bring new certifiable solutions to The CX24951 also contains an 11-bit D/A converter, which can market. The unique architecture of the CX24951 provides a accommodate 65 MHz of upstream bandwidth for EuroDOCSIS number of advantages for cable modem manufacturers and and DVB applications, and a QPSK/8/16/32/64/128 QAM burst cable operators alike. The software programmability of the dual upstream modulator. Conexant’s proven PHY technology exceeds network processing engine allows manufacturers to customize all DOCSIS/EuroDOCSIS 2.0/1.1/1.0 requirements for low BER the CX24951 for application specific requirements, both at in noise-filled environments. the cable MAC and software applications layer. The CX24951 is the fastest solution in the industry with The software programmability of the CX24951 allows one base integrated dual software programmable network processing platform to support numerous products, including PacketCable, engines on board. Its unique packet management, unified CableHome and set-top box products as shown in the CX24951- memory architecture, and advanced system buses, maximize based cable modem block diagram. In addition, the architectural performance by allowing segmentation of real-time-critical similarities between the CX24951 and its predecessor, the DOCSIS/EuroDOCSIS 2.0/1.1/1.0 functions from non CX24943, allows for maximum reuse of certified code. real-time-critical application processes. The CX24951 processor performance and unique architecture enables DOCSIS/EuroDOCSIS 2.0/1.1/1.0 and other software applications, including VPN firewall for added security and routing for cable home or VoIP for PacketCable. The CX24951 provides the ability to adapt to a multitude of standards by downloading different software into the embedded dual network processing engine, including DOCSIS/EuroDOCSIS 2.0/1.1/1.0, DVB and proprietary standards. Finally, cable operators can download complex feature enhancements above and beyond The CX24951 also incorporates a PHS (Payload Header simple code upgrades to field-deployed solutions, minimizing truck Suppression requirement introduced in DOCSIS 1.1) engine rolls and equipment obsolescence. in hardware. Implementation of PHS in hardware further boosts the performance of the CX24951 by relieving the internal CPU from performing repeated filtering operations. Complete Hardware and Software Solution To reduce the resources and development time required to bring CX24951-based cable modem solutions to market, Conexant provides complete certifiable DOCSlS/EuroDOCSIS 2.0/1.1/1.0 cable modem reference designs which incorporate all of the hardware and software needed for DOCSIS certification. DMA Interrupt Controllers Applications Network Processor Peripheral I/O Memory Cable modem reference designs include Conexant software that is compliant to DOCSIS/EuroDOCSIS 2.0/1.1/1.0 and include the USB drivers that meet Microsoft’s Windows Hardware Quality Lab (WHQL) requirements. Additional software enhancements that are above and beyond standards-based requirements are also included A D C Cable PHY Downstream D A C Cable PHY Upstream S-CDMA A-TDMA USB Cable MAC Network Processor Host Interface MII CX24951 Single-Chip Cable Modem IC Block Diagram in this complete software offering. Broadband Modems Cable Modems CX24951 Features Cable PHY Downstream Host Interface • • • • • • Master mode - 16-bit data - 8-chip selects • Supports Flash, IP telephony, PCMCIA - IEEE 802.11a or IEEE 802.11b - 16/32-bit Slave mode (external host and test) 10-bit A/D Direct IF sampling at 44 and 36 MHz QPSK/16/32/64/128/256 QAM demodulator Programmable equalization Annex A, B and C FEC Cable PHY Upstream • • • • • USB 1.1 11-bit D/A A-TDMA S-CDMA with Turbo Trellis coding QPSK/8/16/32/64/128 QAM burst modulator Programmable pre-equalization • Integrated 12 Mb transceiver • Communications peripheral device Memory DMA Interrupt Controller • • • • 20 asynchronous channels Memory to memory moves: aligned/unaligned Source/destination mode for simple data transfer Circular/linked buffer support for inbound/outbound data Peripheral I/O • 32 GPIO • JTAG boundary scan • UART TDM clock and frame sync generator Transmit clock generator Supplied 25MHz Ethernet reference clock Internal USB clock Package and Power • • • • • DOCSIS 2.0/1.1/1.0 • EuroDOCSIS 2.0/1.1/1.0 • PCI Product Applications ARM940T microcontroller Up to 225 MHz operation 4KB instruction and 4KB data cache Embedded ICE and debug extensions HCS 16- and 32-bit CRC single-cycle engines (DOCSIS/EuroDOCSIS 2.0/1.1/1.0, DVB, Proprietary) • Cable Modems with Ethernet • Cable Modems with USB • Cable Modems with IP Telephony • PCI Cable Modem Card Internal (CMCI) • Cable Modem with Home Networking • PCMCIA Cable Modem • Digital Set-Top Box with Cable Modem • CPE Controlled Cable Modem (CCCM) MII • IEEE 802.3 MAC layer • Networking technologies - 10/100 Ethernet - Conexant HPNA 2.0 - Conexant HomePlug 1.0 © 2002, Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant logo are registered trademarks of Conexant Systems, Inc. All other trademarks are owned by their respective owners. Although Conexant strives for accuracy in all its publications, this material may contain errors or omissions and is THIS MATERIAL IS PROVIDED AS IS AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. www.conexant.com General Information: U.S. and Canada: (800) 854-8099 International: (949) 483-6996 Headquarters – Newport Beach 4311 Jamboree Rd, P.O. Box C Newport Beach, CA 92660-3095 Conexant shall not be liable for any special, indirect, incidental or consequential damages as a result of its use. 228 PBGA (17mm x 17mm) All I/O at 3.3V Power supply: 3.3V and 1.3V <550 mW (typical) Reference Designs Application Network Processor 02-0671 • • • • • Watchdog timer • Four additional timers • Interrupt controller • Software Programmable - DOCSIS 2.0/1.1/1.0 compliant - EuroDOCSIS 2.0/1.1/1.0 compliant - DVB compliant - Fixed wireless compliant - Proprietary standards • Two PHS engines • Internal 64KB data memory • Internal 128KB Instruction memory • Three 56-bit DES/CRC engines • PID, SID, DA/SA, MAC, IP and LLC filtering subject to change without notice. Phase-Locked Loops (4) Miscellaneous Functions Cable MAC Network Processor • • • • • • Internal 8K x 32 SRAM • External SDRAM Interface - 16-bit interface - Supports both 4MB and 8MB technologies Order# 102113A