博通(Broadcom)公司的BCM4716/7/8是Intensi-fi™ XLR 802.11n双频带(2.4/5GHz)片上系统(SOPC)路由器,它集成了533MHz的CPU架构和高性能的存储器架构,适用于高端吉比特以太网路由器,它的USB主端口支持媒体存储路由器.即时的双频带路由器能使用户采用5GHz部分用于视频流和VoIP呼叫,而2.4GHz部分用于典型的数据应用.本文介绍了BCM4718的主要特性和主要优势, BCM4716/7/8方框图和系统应用方框图.
Intensi-fi™ XLR 802.11n Simultaneous Dual-Band (2.4/5 GHz) Router System-on-Chip
The Broadcom BCM4716/BCM4717/BCM4718 processor is the highest performance System-on-a-Chip (SoC) in the Intensi-fiTM processor family. It is a Draft IEEE 802.11n-compliant CPU/MAC/baseband/radio router solution designed to work with various external switch arrangements, including 10/100/1000, 10/100, or a single-port PHY. Integrated on-chip is a powerful 533 MHz MIPS32® 74KTM 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 (TLB). Enhanced CPU memory subsystem architecture provides increased system performance.
Using multiple in/multiple out (MIMO) signaling with Draft 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 (BCM4716 supports legacy IEEE 802.11b/g devices only). This improved functionality is accomplished through a combination of enhanced MAC and PHY implementations, including spatial multiplexing modes in the transmitter and receiver and 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. Switched antenna diversity operation is also supported for three antennas. 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 access point (AP) configurations. The BCM4716/BCM4717/BCM4718 supports WPS and also Broadcoms widely accepted and deployed SecureEasySetup™ application for ease-of-use wireless secured networks.
The BCM4717 integrates one USB 2.0 EHCI host port, and the BCM4718 integrates two USB 2.0 EHCI host ports. The BCM4718 includes an 8/16-bit parallel external bus interface (EBI) for flash memory as well as other generic parallel devices. There are 16 dedicated GPIOs.
主要特性:
High-performance System-on-a-Chip (SoC) processor
Draft IEEE 802.11n-compliant CPU/MAC/baseband/radio wireless router solution
Designed to work with various external switch arrangements (10/100/1000, 10/100, and single-port PHY)
Integrated 533-MHz MIPS32® 74K™ core
32-KB I-cache, 32-KB D-cache
64-entry translation lookaside buffer (TLB)
Enhanced 10/100/1000 Ethernet MAC controller with TCP segmentation and checksum offload
Integrated dual-band radio transceiver
Embedded hardware acceleration
State-of-the-art security (IEEE 802.1X/WPA/WPA2)
USB 2.0 EHCI host ports
Up to 2-Gbit DDR SDRAM and up to 64-MB flash memory
主要优势:
Single chip with reduced power consumption enables compact form factors with low cost.
Optimized reduced bill of materials (RBOM) and PCB to enable smallest cost delta over IEEE 802.11g designs.
Reduced host CPU utilization.
Enhanced system performance.
Two-stream spatial multiplexing with data rates up to 300 Mbps.
Multiple memory (DDR/flash) configurations supported to enable low-end to high-end performance options.
应用:
Single- and dual-band Draft IEEE 802.11n wireless home routers/access points (AP)
Gigabit and 10/100 Ethernet routers and access points/WET
Simultaneous dual-band routers with additional MAC/PHY/ Radio (BCM4322, for example)
图1.BCM4716/7/8方框图和应用方框图
本文关键字：暂无联系方式电子技术，电工技术 - 电子技术
