AMCC 405EX企业接入点参考设计

AMCC公司的PowerPC通信处理器PPC405EX集成了先进的处理器功能和外设与存储器接口,以及先进的安全引擎,支持各种加米协议,包括IPSec, SSL, 和DTLS,非适合需要极好性能,小占位面积和低功耗的下一代WLAN应用.本文介绍了PPC405EX的主要特性,方框图以及无线-N 企业接入点参考设计主要特性, 硬件指标, 参考设计方框图和详细的电路图.

The PPC405EX combines the proven perfomance of the market leading PPC405 processor with a high performance suite of periferal and memory interfaces, including PCI Express, USB2.0 On-the-Go, DDR 2/1 and Gigabit Ethernet. The PPC405EX also incorporates an advanced security engine, featuring header/trailer processing capability and support for the broadest range of security protocols, including IPSec, SSL, and DTLS. The PPC405EX is ideally suited for the next generation WLAN applications that require exceptional performance, small foot print and low power.



图1.PPC405EX嵌入控制器功能方框图
PPC405EX 主要特性:
Superior Price/Performance for Cost Sensitive Wireless Access Applications
Delivers 333 MHz to 600 MHz performance (506 to 912 DMIPs)
Dual 1-lane PCI ports
Supports up to 2 GBytes of DDR 2/1 DRAM
High performance Security Engine supports IPSec, SSL, DTLS and SRTP (optional)
Two 10/100/1000 Ethernet MACs
On-the-Go USB 2.0 port
8/16/32-bit External Peripheral Bus Controller
External Bus Master Interface (EBMI)
Two UARTs (UART0 with full hardware modem flow control)
32 GPIOs
Low power dissipation, small form factor for high-density, power-conscious applications

PPC405EX 无线-N 企业接入点参考设计
With the growth in high bandwidth applications such as high-definition video and growing use of Voice-over-IP, improved network performance is essential. AMCC’s reference design solution meets the growing business demand for access, speed and security.

Draft 802.11n-compliant wireless chipsets are used in this solution to deliver the ultimate wireless triple play experience for video, voice and data transmission. The reference design supports up to two radio cards, with each radio card having a triple-radio single-chip solution for MIMO 11n. These radio cards dramatically increase the overall throughput of the wireless LAN by supporting link rates as high as 300 Mbps - an improvement of nearly six times the throughput of standard 802.11g.

Each radio card is interoperable with standard 802.11b and 802.11g devices and fully supports industry-standard compliant security and Quality of Service (QoS). The chipset baseband processor includes a hardware encryption engine to support WEP, TKIP and AES. It automatically calculates the data integrity and RF signal strength of the wireless channel and continually tunes for optimal RF channel and transmit-power, while enforcing the prioritization of delay-sensitive voice and other critical applications. Moreover, the integrated QoS features provide consistent voice and video quality on both wired and wireless networks, enabling the deployment of business quality VoIP and video applications.

The radio cards include dual-diversity antennas on both 2.4 GHz and 5 GHz bands. By leveraging multi-path reflections of a radio signal and overlaying multiple signals of multiple radios in a single 20MHz radio channel, the MIMO (Multiple In Multiple Out) multiplies the effective data rates and reliable coverage area without using additional frequency spectrum, and without causing interference with other Wi-Fi devices or networks. The signal reflections which were a concern in earlier deployments are used to increase the range and reduce the dead spots in the wireless coverage area using MIMO technology.

While one .11n card radio can be used in supporting latency sensitive voice and video applications in large enterprise Wi-Fi deployments, the second radio card can be used exclusively for Wi-Fi coverage and client interoperability in less latency sensitive data networks. The Makalu hardware supports wireless-N, wireless-a, wireless-b, or wireless-g clients, while Power over Ethernet (PoE) support makes it easy to install the Access Point anywhere, even without ready access to a power plug - the installer only needs to run one cable to the Access Point to deliver both data and power.

无线-N 企业接入点参考设计主要特性:



无线-N 企业接入点参考设计硬件指标: