Mobile devices - tablet

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If consider today's smart phones and tablets, the concept of work is almost no difference, but a significant difference in the size of the screen to show the content. The trend is the growing use of screen smartphone, regarding readability, so this is how closer to tablet. Moreover, the primary purpose of their wireless communication at a distance, even though many have Wi‑Fi features about connecting to your home network, and searches the Internet to remote locations is still too expensive peculiarity. True, a smartphone with a client-server features of program support, if implemented, can manage devices in the Wi‑Fi environment, smaller and more accessible regarding the operation of the tablet, but the opinion of the author of these lines is still more comfortable to watch multimedia content on a tablet, and the resources of tablet are more powerful. It would be nice to have access to both devices, preferably the same company, but still give priority pill. Versatile for use on all user-household. And both there in abundance of all sorts of manufacturers. The following table shows the characteristics of only some of them.

Figure 2.1 Comparison of tablet computers from different manufacturers.

First, it is interesting to notice is that the screen is slightly smaller in size than the screen of CRT computer monitor IBM PC-XT from in 1983. year, and that the capacity of micro SD card significantly exceeds its hard drive. And other components of tablet surpass specified PC. Indeed, depending on the built-in capabilities to serve as a phone. A simple device for handling with multiple options. Thus, the development of microelectronics is more than obvious. Particularly with regard to multimedia content. According to the specifications in Table tablet mobile screen larger than a mobile phone that can have all the features as well as a mobile phone. Almost most tablets use ARM (Advanced RISC Machines) microprocessor family, which combines the CPU and GPU organization into a unified whole, of which perhaps the most interesting microprocessor 'Cortex - Dual Core A15' using at two models shown in the table, and it is characterized by great flexibility in the making. The most powerful version of 'Cortex-A15 MPCore' has the following main features:

• Architecture - Cortex RISC multiple core microprocessor 32-bit architecture and ARMv7 instruction set, 15 stage pipeline, clock speed of 1 GHz to 2.5 GHz.
• Multiple cores - Do two groups of core and associated control systems, from one to four cores in the group, each with a 32-bit CPU has support for hardware virtualization, 32 kB instructional and 32 kB data L1 cache, FPU and NEON graphics and audio driver system (MPE - Media Processing Engine) designed for multimedia. Their work is supervised by a common 'CoreSight SoC's system for monitoring and debugging.
• Transaction interface - ACP (Accelerator Coherence Port) interface of group that supports all standards regarding read and write transactions without additional requirements for compliance work. Connections between L1 cache, SCU and L2 cache.
• Control units, monitoring and oversight of work - 'SCU' (Snoop Control Unit) and 'CoreSight' (Program Flow Trace) circuits of group responsible for managing interconnections judgment and control communications between caches, data transfer and other features useful to the processor. These include DMA controller and control of interruptions.
• L2 cache - Up to 4 MB of shared caching per group, low latency and high throughput. L1 and L2 cache ECC (Error Correction Control) SRAM type with control of parity, which means that the processor is at home in the server environment. L2 cache uses 64-bit addressing.
• Bus interface - 128-bit bus (for two 64-bit groups) as an effective interface with all other circuits embedded in a mobile device. Can communicate with the L3 cache, network hardware, PCI-e circuits, FLASH, SATA and USB devices and even some specific peripherals. Impresses the possibility of addressing up to 1 TB of DDR 3/4 working memory because the microprocessor uses 40-bit addressing (Large Physical Address Extensions - LPAE) using embedded memory control system composed of this interface.

How many of these will be incorporated into the casing of microprocessors and apply depends on ordering party. The above version of the microprocessor and its previous versions are the basis for microprocessors Nvidia Tegra, Texas Instruments (TI) OMAP and others, and to him and he saw the Apple A6. From the table in Figure 2.1 shows that the appearance of tablets in all sizes approximate performance, but their computing power are different. The following picture shows one per resolution weakest and least expensive model in the table, although he can fully meet user about their dedicate.

Figure 2.2 Samsung Galaxy Note 10.1 tablet.

What is interesting for the model shown is that both of the two models at the end of the table using the same microprocessor technology but different concepts and power, with their operating system from the same family, but different revisions. By definition, the most powerful model used until now (autumn 2013.) The latest version of the operating system 'Android' and the table shows that almost all presented models have a different operating system. In addition, the amount of money that the user is ready to invest in a mobile device depends on the number of 'available' enlargement. Shown tablet almost resembles the laptop or notebook, but no keyboard or mouse. Does he need? Basically no, because a tablet has a touch screen that is easy to manage, and the keyboard is needed is displayed as an image with the 'touch'. If tablet is rotated, and keyboard adapt to the new position of the user. This is not a rule, because the 'Microsoft Surface' available cover of screen that represents a very thin keyboard, a futuristic version of the mouse, and a special pen (Pen Input) provides some additional useful activities.

How the market will accept certain types of these devices will show time. The following figure shows the relationship of operating systems and devices on the world market at late of 2010. year.

Figure 2.3 Statistics of mobile OS and devices.

'Other' has very much, because there are among the operating systems of all generations of operating systems, which means that the main 'battle' waged between 'iOS' and 'Android' operating system. The peculiarity of these rivals is that both of the two rapid growth up an increasing part of the presented 'pie', but it is essentially a huge difference.

• Apple iOS - For other manufacturers 'closed' operating system that powers devices with enviable performance components callsigns worked exclusively on his ideas and requirements, which will work on the stability, security and the number of available applications that can be downloaded from their seats in a huge surcharge of course, you might just because as soon a large number of software products. But the flaw had 'closed' system, everything is a part of a company and collects a 'fee' to bidders of software products. Not so long ago it was worth a rule that 'Apple' computers were sacrosanct about graphics processing and preparation for printing, while PC compatible computers used for the rest. There's one little thing, there's no micro SD or USB port, except as questionable third-party add-ons, which roughly means 'pay, download and watch' and it is a basic feature of their multimedia devices.
  
  
• Android - Although Google initiator about making this operating system and also its main pillar, is available to all producers are willing to deal with the manufacturing of mobile devices, which means that the operating system can run on different hardware platforms and that the performance of the unit offered very different in quality and prices, which is a wider range of customers very well. In other words, an increasing number of different devices that use this operating system. Program offerings purchased in a similar manner as in the foregoing, but the fee for developers is acceptable and Google offers a free development environment for this platform, which provides for different operating systems (Windows, Mac, Linux).

Although the percentage of presence in the market for both products is growing, Android is growing faster, which is not surprising because it has accepted a multitude of manufacturers, and has already proven programming and strong company - Google, really can offer quality solutions, especially for the sake of it because it is always ready to listen good suggestion and affordable for cooperation. It is hard not to note that the current leadership has the iPad, because of faith in the quality of the product, and probably because they were the first to introduce this type of mobile device and failed to protect against industrial espionage. While the other way around, they are well earned. In America, they have great popularity while in Europe and Asia, not really. Described resembles the story of a company PHILIPS that has developed 'tape' and gave free license rights to others, but while other way around ...

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