ST的SPEAr600應(yīng)用于MPU嵌入式VoIP解決方案

SPEAr600 是具有雙ARM926EJ-S核的嵌入式MPU, 性能高達(dá)733 DMIPS,支持靈活的存儲(chǔ)器,有功能強(qiáng)大的連接特性和可編程的LCD接口. ARM926EJ-S內(nèi)核的工作頻率高達(dá)333MHz,其中的MMU支持虛擬的存儲(chǔ)器管理,是系統(tǒng)能和Linux操作系統(tǒng)兼容.主要用在需要大量計(jì)算的應(yīng)用中如企業(yè)VoIP設(shè)備,可編邏輯控制器(PLC),醫(yī)療實(shí)驗(yàn)室/診斷設(shè)備,無線接入設(shè)備,家用電器等.本文介紹SPEAr600主要特性,方框圖, 典型系統(tǒng)架構(gòu)圖以及EVALSPEAR600評(píng)估板主要特性,電路圖和材料清單(BOM).

The SPEAr600 is a member of the SPEAr family of embedded MPUs for networked devices, it is based on dual ARM926EJ-S processors (up to 333 MHz), widely used in applications where high computation performance is required.

Both processors have an MMU supporting virtual memory management and making the system compliant with the Linux operating system. They also offer 16 KBytes of data cache, 16 KBytes of instruction cache, JTAG and ETM (embedded trace macro-cell) for debug operations.

To expand its range of target applications, SPEAr600 can be extended by adding additional peripherals through the external local bus (EXPI interface).

SPEAr600主要特性:

■ Dual ARM926EJ-S core up to 333 MHz:

– Each with 16 Kbytes instruction cache + 16 Kbytes data cache

■ High performance 8-channel DMA

■ Dynamic power saving features

■ Up to 733 DMIPS

■ Memory:

– External DRAM interface: 8/16-bit DDR1-333 / DDR2 – 666

– 32 Kbytes BootROM / 8 Kbytes internal SRAM

– Flexible static memory controller (FSMC) supporting parallel NAND Flash memory

Interface

– Serial NOR Flash Memory interface

■ Connectivity:

– 2 x USB 2.0 Host

– USB 2.0 Device

– Giga Ethernet (GMII port)

– I2C and fast IrDA interfaces

– 3 x SSP Synchronous serial peripheral (SPI, Microwire or TI protocol) ports

– 2 x UART interfaces

■ Peripherals supported:

– TFT/STN LCD controller (resolution up to 1024 x 768 and colors up to 24 bpp)

– Touchscreen support

■ Miscellaneous functions

– Integrated real-time clock, watchdog, and system controller

– 8-channel 10-bit ADC, 1 Msps

– JPEG codec accelerator

– 10 GPIO bidirectional signals with interrupt capability

– 10 independent 16-bit timers with programmable prescaler

■ 32-bit width External local bus (EXPI interface).

■ 3 x I2S interfaces for audio features:

– One stereo input and two stereo outputs (audio 3.1 configuration capable)

■ Software:

– System compliant with all operating systems (including Linux)

SPEAr600應(yīng)用:

■ The SPEAr® embedded MPU family targets networked devices used for communication, display and control. This includes diverse consumer, business, industrial and life science applications such as:

– IP phones, thin client computers, printers, programmable logic controllers, PC docking stations,

– Medical lab/diagnostics equipment, wireless access devices, home appliances, residential control and security systems, digital picture frames, and bar-code scanners/readers.

圖1.SPEAr600功能方框圖

圖2.SPEAr600典型系統(tǒng)架構(gòu)圖

來源：21IC電子網(wǎng)