ST的SPEAr600应用于MPU嵌入式VoIP解决方案

SPEAr600 是具有双ARM926EJ-S核的嵌入式MPU, 性能高达733 DMIPS,支持灵活的存储器,有功能强大的连接特性和可编程的LCD接口. ARM926EJ-S内核的工作频率高达333MHz,其中的MMU支持虚拟的存储器管理,是系统能和Linux操作系统兼容.主要用在需要大量计算的应用中如企业VoIP设备,可编逻辑控制器(PLC),医疗实验室/诊断设备,无线接入设备,家用电器等.本文介绍SPEAr600主要特性,方框图, 典型系统架构图以及EVALSPEAR600评估板主要特性,电路图和材料清单(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应用:

■ 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.

图1.SPEAr600功能方框图

图2.SPEAr600典型系统架构图

来源：21IC电子网