BCM4748 Brief ® INTENSI-FI® XLR 2 × 2 IEEE 802.11N 2.4 GHZ + 5 GHZ SOC SUMMARY OF BENEFITS FEATURES • High-performance, low-cost IEEE 802.11n-compliant System- • Single-chip IEEE 802.11n with reduced power consumption on-a-Chip (SoC) CPU/MAC/baseband/radio for enterprise wireless Access Point (AP) solutions enables compact form factors with low cost and highperformance. • Optimized Intensi-fi ® XLR platform with Accelerange™ • Optimized reduced bill of materials (RBOM) and PCB enable Technology — a unique set of hardware and software enhancements that ensure more robust wireless coverage smallest cost delta over IEEE 802.11g designs. • Reduced host CPU utilization • Integrated 533 MHz MIPS32® 74K® core • Enhanced system performance • 32 KB I-cache, 32 KB D-cache • 64-entry translation lookaside buffer (TLB) • Two-stream spatial multiplexing with data rates up to 300 Mbps • Enhanced 10/100/1000 Ethernet MAC controller • Multiple memory (DDR/Flash) configurations supported to • Integrated dual-band radio transceiver enable low-end to high-end performance options • On-chip SRAM for latency-sensitive applications APPLICATIONS • State-of-the-art security (IEEE 802.1X/WPA™/WPA2™) • USB 2.0 EHCI host ports • Single- and dual-band IEEE 802.11n enterprise wireless APs • Up to 2 Gb DDR SDRAM and up to 32 MB Flash memory • Simultaneous dual-band AP with additional MAC/PHY/ radio (e.g., BCM4342) Functional Block Diagram 2x2 11n BCM4748 2.4/5 GHz (BCM4748) FEM/PA Draft 802.11n MAC/BB/Radio 2x2 11n 533 MHz (BCM4748) Flash Interface Flash Memory MIPS32® 74K® Core 2.4/5 GHz 1-Lane PCIeTM RC FEM/PA BCM4342E I-Cache (32 KB) D-Cache (32 KB) EJTAG DDR1/DDR2 (BCM4748) SRAM 128 KB GPIO GPIOs UART UART Interface I2S and S/PDIF Audio Interface DDR SDRAM I/F 10/100/1000 MAC MII/RvMII/RGMII Interface High-Speed USB 2.0 Host USB 2.0 Host Ports Two BCM4748 OVERVIEW The Broadcom BCM4748 processor is the highest performance SoC in the Intensi-fi XLR processor family. This device is an IEEE 802.11ncompliant CPU/MAC/baseband/radio AP solution designed for enterprise applications. Integrated on-chip is a powerful 533 MHz MIPS32 74K core with four-way set associative 32 KB instruction cache, a 32 KB two-way set associative data cache, and a 64-entry translation lookaside buffer. Enhanced CPU memory subsystem architecture provides increased system performance. Using multiple in/multiple out (MIMO) signaling with IEEE 802.11n protocol, information is sent and received over two or more antennas simultaneously using the same frequency band, thus providing greater range and increasing throughput while maintaining compatibility with legacy IEEE 802.11a/b/g devices. This improved functionality is accomplished through a combination of enhanced MAC and PHY implementations, including spatial multiplexing modes in the transmitter and receiver as well as advanced digital signal processing techniques to improve receive sensitivity. With its fully integrated dual-band radio transceiver, the chip architecture supports two streams with two antennas for TCP throughput of over 200 Mbps per radio. Switched antenna diversity operation is also supported for three antenna configurations. State-of-the-art security is provided by industry-standardized system support for WPA, WPA2 (IEEE 802.11i), and hardware-accelerated AES encryption/decryption coupled with TKIP and IEEE 802.1X support. Embedded hardware acceleration enables increased system performance and significantly reduces host CPU utilization in both client and AP configurations. The BCM4748 supports Broadcom FASTPATH® Unified Access Point (UAP) software to enable complete enterprise AP solutions for standalone or switch-managed products. The BCM4748 integrates two USB 2.0 EHCI host ports. The device also includes an 8/16-bit parallel external bus interface (EBI) for Flash memory as well as other generic parallel devices. The 16 dedicated GPIOs are another feature of the device . Device Features Feature BCM4748 Package ball count 570 pins CPU 480 MHz SDRAM 32-bit DDR2 up to DDR2-533 Flash Serial or 8-bit parallel Flash Ethernet (External PHY + MII/RGMII) Yes PCIe™ Yes USB 2.0 port Two hosts 2 IS Multiplexed onto six parallel Flash pins GPIO 16 Band 2.4 GHz/5 GHz Support for up to three antennas Yes External LNA support Yes, multiplexed onto eight GPIOs Reference design BCM95474EAP Broadcom®, the pulse logo, Connecting everything®, the Connecting everything logo, Intensi-fi® XLR, Accelerange™ Technology, and SecureEasySetup® 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 5300 California Avenue Irvine, California 92617 © 2009 by BROADCOM CORPORATION. All rights reserved. 4748-PB00-R 05/06/09 Phone: 949-926-5000 Fax: 949-926-5203 E-mail: [email protected] Web: www.broadcom.com