Arm Jtag
INTRODUCTION: TI OMAP 3430 microcontroller is a highly integrated controller directed at the Smartphones segment. It supports most functions needed of a Smartphone controller in practically just one chip package. All you need are some support chips surrounding it, to make a Smartphone product. Beside the main phone functions and email + IM functions that are considered necessary today; handling video is the biggest challenge for such processors. Video, particularly HD video takes a lot of processor power. In a mobile application keeping the power budget low is another necessity. Looks like the TI OMAP 3430 does that well. It is the first member of the OMAP 3 family aimed at the Smartphone segment.
Palm Pre uses the processor as does some models of Sony Ericsson. Apple is rumored to be considering this processor for a future upgrade. It is interesting to take a look at how Texas Instruments is managing this difficult trade off; the trade off between high loads of processing within a low power budget!
THE OMAP 3430: The key to the solution is the choice of using the newest ARM Cortex-A8 processor core as the workhorse in this solution. This is supported by two major blocks that help with all the graphics and multimedia workload. One is a 2D/3D graphics accelerator and the second one is a imaging video accelerator. Other blocks implemented in the TI silicon solution include LCD interface, Camera interface, a USB OTG port, memory control and DMA control, various interconnects and peripheral support and a video out port.
Some of the functions supported are GPS functionality, mobile TV interface, wireless link, mobile data and voice interface, a modem interface and a touch screen controller. One supporting chip TWL 5030 not only manages power but supplies audio/video codec support. It also manages USB and keypad interfaces. Other interfaces provided are Flash memory interface (NAND or NOR), a mobile DDR interface, Trace and JTAG interfaces. Some GPIO lines, a camera serial/parallel and a serial camera interface are also available. Lastly, a group of interfaces provide a flash memory card interface, a TV interface with S-Video and a display controller Parallel-serial.
Managing all that functionality and the high resolution video needs a truly innovative processor core. It is worth investigating how the ARM Cortex-A8 implements the functionality.
THE CORTEX-A8 CORE: The Cortex family is based on the latest ARMv7 architecture from ARM. There are three flavors of the processors from this family; applications processors, real time processors and microcontrollers.
The applications processors support a full fledged virtual memory complexity and use a MMU. The real time processors are expected to be used for deep embedded use and only a memory protection unit is provided. The micro-controllers version does not have either a MMU or a MPU and only straight addressing space is supported.
The cortex-A8 is capable of processing VGA, H.264 video at 350 MHz and does it at a low power budget of 300 mW! The main features that make the processor fast are a superscalar architecture, a deep multi-stage instruction pipeline and a video processing engine based on what they call NEON technology. They have also implemented the Thumb-2 technology that produces very dense code. Code that take up low memory space yet is powerful enough to implement meaningful functionality. Thumb-2 is supported by runtime Jazelle RCT that produces just in time byte-code.
The superscalar arrangement issues two instructions for parallel execution by the two execution units available. This is a in-order pipeline. Out of order pipeline would have called for addition of complex logic on chip. So that was traded off against the need for keeping power consumption low. So you have the potential to double the performance most of the time.
A 13 stage instruction pipeline you have the instructions working 13 times faster in a strict sequential program. On an average one could expect at a least order more of processing speed. Combine all that with a separate SIMD video processor with its own pipeline and you start to see why the Coretex-A8 is such a powerful device. Add the embellishments TI has and you have a very powerful engine for implementing Smartphones.
Debasis Das consults on Embedded Systems, Software development & Testing, coaches students of Electronics & Computer Science, and manages content development. He has worked with technology companies for close to four decades, 25 years of which has been with IT consulting companies. He has managed software and Geospatial industry outsourcing from India for International clientele. He has worked with customers from US, Europe, Japan and China. He is widely traveled.
Contact at ddas15847@yahoo.com
ddas15847@gmail.com
Web site at http://www.consult-debasis.com
uniJTAG – The Universal JTAG Programmer
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