BCM1255 ® DUAL-CORE 64-BIT MIPS® PROCESSOR SUMMARY OF BENEFITS FEATURES • Two 64-bit MIPS® CPUs, scalable from 800 MHz–1.2 GHz • Quad issue in-order pipeline with dual-execute and dual-memory pipes • Enhanced skew pipeline enables a zero load-to-use penalty • 32-KB instruction cache and 32-KB data cache (ECC protected) • Fast on-chip multiprocessor bus • Connects the CPUs, L2 cache, memory controller, and I/O bridges • Runs at half the CPU core frequency and is 256 bits wide • On-chip L2 cache • 512 KB shared by two CPUs and I/O agents • Eight-way associative, ECC protected • Any way can be programmed as fast on-chip RAM • DDR memory controller • Memory bandwidth as high as 100 Gbps • Configurable as 2 x 64-bit or 4 x 32-bit wide channels • Runs up to 400-MHz clock rate, 800-MHz data rate • Support for DDR1 and DDR2 • Integrated network and system I/O • Four Gigabit Ethernet MACs configurable as packet FIFO interfaces • 64-bit PCI-X® interface at 133 MHz • Generic I/O for direct connect to boot ROM, flash memory • Two SMBus serial configuration interfaces • PCMCIA control interface and up to 16 interrupts • Four UART interfaces On-chip debug capability • EJTAG • Bus trace unit (internal logic analyzer) Support for leading operating systems, including VxWorks®, Linux®, and QNX® • Industry-leading performance • 2.5 Dhrystone MIPS/MHz per CPU • 10 million packets per second of L3 forwarding • 128 Gbps on-chip bus bandwidth, with 100 Gbps memory bandwidth and 31 Gbps 1/0 bandwidth • • • Low-power dissipation of 13W @ 1 GHz • • Software-compatible with the BCM1250 and BCM112X High functional integration, reducing overall system cost Programming ease and flexibility based on MIPS64® instruction set architecture (ISA) Broad tools and system software support APPLICATIONS • Because of its world-class performance, power efficiency, and integration, the BCM1255 processor is ideal for a broad variety of applications, including: • Enterprise-class routers and switches • Multifunction security platforms (VPN/SSL/IDS) • Compact NAS platforms • SAN routers/gateways/switches • Video servers and systems Evaluation board platform available with samples (includes tools, firmware, and software drivers) BCM1255 Applications VPN/Firewall Application Storage System or Video Server DRAM DRAM SATA Disk Drives GMII Control Path GMII BCM1255 GMII PCI-X ServerWorks SATA Bridge BCM1255 Data Path FIFO 4xGMII BCM5841 2 Gbps Full-Duplex IPSec JTAG OVERVIEW Debug/ Bus Trace SB_1 Core SB_1 Core 512K L2 Cache DDR Memory Controller 100 Gbps 256 Bits Serial Interfaces ZBBus Data Mover 1/2 core clock; 128 Gbps @ 1 GHz Dual SMBus DMA DMA DMA DMA 10/100/ 1000 MAC 10/100/ 1000 MAC 10/100/ 1000 MAC 10/100/ 1000 MAC GPIO/ Interrupt/ PCMCIA I/O Bridge Generic Bus & Flash I/O 64 Bit PCI-X 8 Gbps 4xGMII (and/or Packet FIFO) 1 Gbps BCM1255 Block Diagram The BCM1255 device is a MIPS64 processor core-based system-on-a-chip (SOC) that offers industry-leading performance, high functional integration, and low power levels required by next-generation computing, storage, and networking applications. The BCM1255 is a chip multiprocessor (CMP) system consisting of two Broadcom SB-1 high-performance MIPS64 CPUs, a shared 512-KB L2 cache, a DDR memory controller, and an integrated I/O. All major blocks of the processor are connected together via the ZBbus™, a high-speed, split-transaction multiprocessor bus. functions assist both hardware and software designers in debugging and tuning the system. The system can be run in either big-endian or little-endian mode. Implementation of MIPS64 ISA The SB-1 CPU core is a high-performance implementation of the standard MIPS64 ISA that incorporates the MIPS-3D and MIPS-MDMX applicationspecific extensions (ASEs). The core supports a four-issue enhanced skew pipeline and can dispatch up to two memory and two ALU (integer, floating point, MDMX, or MIPS-3D) instructions per cycle. The bus implements the standard MESI protocol to ensure coherency between the two CPUs, L2 cache, I/O agents, and memory. Four Gigabit Ethernet (GbE) MACs (10/100/1000) enable easy interfacing to LANs or control backplanes. To enable higher data rates (or in cases where Ethernet protocol processing is not required), the GbE MACs can be configured as 8-bit and/or 16-bit packet FIFOs. The BCM1255 also integrates a 64-bit 133-MHz PCI-X local bus for direct connection to I/O devices. Four serial ports are available for use as UARTs for console ports. Next-Generation Broadband Processors # of CPUs L2 Cache DDR2 Support # of MACs PCI-X # of SPI-4/HT Ports BCM1255 BCM1280 BCM1455 BCM1480 2 2 4 4 512 KB 1 MB 1 MB 1 MB Yes Yes Yes Yes 4 GMII 4 GMII 4 GMII 4 GMII 1 x 64-bit 1 x 64-bit 1 x 64-bit 1 x 64-bit 0 3 0 3 To enable low-chip count systems, the BCM1255 also includes a configurable generic bus that allows glueless connection of a boot ROM or flash memory and simple I/O peripherals. On-chip debug, trace, and performance monitoring 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. ® BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 © 2006 by BROADCOM CORPORATION. All rights reserved. 1255-PB04-R 05/12/06 Phone: 949-450-8700 Fax: 949-450-8710 E-mail: [email protected] Web: www.broadcom.com