Freescale 公司的IMX51CEC是消费类电子和工业领域的应用处理器,采用ARM Cortex A8"内核,工作频率高达800MHz,多达200MHz DDR2,支持移动DDR DRAM时钟速率,主要应用在上网,MID,PMP,PND和高端PDA以及游戏机.本文介绍i.MX51主要特性,功能方框图,以及i.MX51开发板(EVK)的硬件性能,包括开发板方框图, i.MX51和DDR II , SPI NOR FLASH和SGTL5000连接图, USB连接图, VGA 和DVI连接图, LCD连接框图以及SD/MMC 连接器连接图与FEC连接图, 电源方框图.

i.MX51 Applications Processors for Consumer and Industrial Products

The i.MX51 multimedia applications processors represent Freescale Semiconductor’s latest addition to a growing family of multimedia-focused products offering high performance processing optimized for lowest power consumption.

The i.MX51 processors feature Freescale’s advanced and power-efficient implementation of the ARM Cortex A8" core, which operates at speeds as high as 800 MHz. Up to 200 MHz DDR2 and mobile DDR DRAM clock rates are supported. These devices are suitable for applications such as the following:

" Netbooks (web tablets)

" Nettops (internet desktop devices)

" Mobile internet devices (MID)

" Portable media players (PMP)

" Portable navigation devices (PND)

" High-end PDAs

" Gaming consoles

" Automotive navigation and entertainment (see automotive data sheet, IMX51AEC) Features include the following:

" Smart Speed Technology—The heart of the i.MX51 processors is a level of power management throughout the device that enables the rich suite of multimedia features and peripherals to achieve minimum system power consumption in both active and various low-power modes. Smart Speed Technology enables the designer to deliver a feature-rich product that requires levels of power that are far less than typical industry expectations.

" Applications Processor—i.MX51 processors boost the capabilities of high-tier portable

applications by providing for the ever-increasing MIPS needs of operating systems and games.

Freescale’s Dynamic Voltage and Frequency Scaling (DVFS) allows the device run at much lower voltage and frequency with sufficient MIPS for tasks such as audio decode resulting in significant power reduction.

" Multimedia Powerhouse—The multimedia performance of the i.MX51 processors is boosted by a multi-level cache system and further enhanced by a Multi-Standard Hardware Video Codec, autonomous Image Processing Unit, SD and HD720p Triple Video (TV) Encoder with triple video DAC, Neon (including Advanced SIMD, 32-bit Single-Precision floating point support and Vector Floating Point co-processor), and a programmable smart DMA (SDMA) controller.

" Powerful Graphics Acceleration—Graphics is the key to mobile game navigation, web browsing, and other applications. The i.MX51 processors provide two independent, integrated Graphics Processing Units: OpenGL ES 2.0 3D graphics accelerator (27 Mtri/s, 166 Mpix/s) and OpenVG 1.1 2D graphics accelerator (166 Mpix/s).

" Interface Flexibility—The i.MX51 processor interface supports connection to all popular types of external memories: DDR2, Mobile DDR, NOR Flash, PSRAM, Cellular RAM, NAND Flash (MLC and SLC) and OneNAND. Designers seeking to provide products that deliver a rich multimedia experience find a full suite of on-chip peripherals: LCD controller and CMOS sensor interface, High-Speed USB On-The-Go with PHY, and three High-Speed USB hosts, multiple expansion card ports (High-Speed MMC/SDIO Host and others), 10/100 Ethernet controller, and a variety of other popular interfaces (PATA, UART, I2C, I2S serial audio, and SIM card, among others).

" Increased Security—Because the need for advanced security for mobile devices continues to increase, the i.MX51 processors deliver hardware-enabled security features that enable secure e-commerce, digital rights management (DRM), information encryption, secure boot, and secure software downloads.

图1.i.MX51功能方框图

i.MX51 EVK硬件

i.MX51 EVK Hardware

The i.MX51 EVK architecture is different form 3DS. It is only one board including CPU and other peripheral blocks. Also it can connect many peripheral cards for expansion functions.

图2.i.MX51 EVK 开发板架构

图3.i.MX51 EVK 开发板顶视图

图4.i.MX51 EVK 开发板底视图

图5.i.MX51 EVK 开发板扩展板外形图

图6.i.MX51 EVK 开发板LCD模块卡外形图

图7.i.MX51 EVK 开发板方框图

图8. i.MX51和DDR II 连接图

图9. i.MX51和SPI NOR FLASH 连接图

图10. i.MX51和SGTL5000 连接图

The SGTL5000 is a low power stereo codec with integrated headphone amplifier. It is designed to provide a complete audio solution for portable products needing line-in, mic-in (mic bias only available in 32QFN version), line-out, headphone-out, and digital I/O.

图11. i.MX51 EVK USB连接图

图12. VGA 和DVI连接图

图13. LCD连接框图

图14. UI扩展连接器接口定义图

图15. SD/MMC 连接器连接图

图16. FEC连接图

图17. 电源方框图