Mobile phone

Iii. mobile phone hardware analysis

Mobile phone has become a star in the recent smart machine product, and its ultra-high hardware configuration is involved.

The body size is 125x63x11. 9mm, and the weight of the whole machine is 149 grams. The camera uses the 4 inch touch screen launched by sharp, with a resolution of 8 54x480 pixels. It is equipped with a GHz Qualcomm snapdrogan System 3 Series msm8260 dual-core processor, with 1 gb ram memory and 4 GB Rom capacity, equipped with a 8 million pixel rear camera, the mah battery is used.

The Qualcomm msm8260, which claims to be the world's highest frequency, has now become a public target. Unlike PCs, the mobile processor platform has a higher degree of integration than the desktop processor, and the frequency does not represent all, the performance of mobile phone processors will be affected by more factors.

Let's look at this processor.

In fact, starting from NVIDIA's tegra 2, mobile processors began to enter the dual-core era. Qualcomm msm8x60, Texas Instruments omap4430, and Samsung exynos 4210 were listed along with their mobile phones, motorola Atrix, LG Optimus 2x, Optimus 3D, HTC sensation, and Samsung Galaxy S ⅱ were released one after another.

These processors are designed with different focuses.

The first is the core processor architecture. tegra 2, omap4430, and exynos 4210 all adopt the cortex A9 kernel, while msm8x60 uses the scorpion kernel designed by Qualcomm.

In the single-core era, most mobile processor manufacturers have adopted the cortex A8 core solution based on the arm V7 instruction set architecture. Only Qualcomm has designed its own scorpion Core Based on the arm V7 instruction set architecture, compared with cortex A8, Qualcomm's core design incorporates some out-of-order execution capabilities, which provide better performance when executing certain commands, this is why Qualcomm processor is ahead of other platforms in the A8 processor age.

However, in cortex A9, the out-of-order execution capability has been fully deployed, but the scorpion core has not been changed, and the out-of-order execution capability has lagged behind the new generation of A9 kernel.

In terms of pure execution capability, the cortex A8, Scorpion, and cortex A9 kernels are 2000 dmips, 2100 dmips, and 2500 dmips at the same 1 GHz clock speed.

However, the scorpion kernel is not completely defeated. The second-level cache is directly connected to the core without passing through the bus to reduce latency. measures such as raising the design frequency to GHz will make up for the architecture design lag.

Another is the multi-processor architecture. The multi-core processors are widely used on the PC platform. Their logical architecture is synchronous multi-processor and there is no competition between different products, but not on mobile platforms.

Qualcomm msm8x60 adopts an asynchronous multi-processor architecture, which is different from other processors. These two architectures have their own advantages. The synchronous multi-processor architecture can have a shorter instruction processing cycle, while the asynchronous multi-processor architecture is more energy-saving.

In terms of the neon multimedia extended instruction set, omap4430 and exynos 4210 adopt the arm standard solution. Each cortex A9 core has a neon multimedia processor to enhance multimedia performance, the neon processor of the msm8x60 doubles the Bit Width, resulting in stronger multimedia acceleration. The neon support is not enabled for tegra 2.

For GPU, because Qualcomm has not published the detailed architecture of adreno220, it will not compare it.

After reading this, you should understand why many netizens named msm8260 "glue processor" recently.

In fact, because of the architecture design, the msm8260 performance is slightly inferior to other dual-core processors, but after the design frequency is increased to GHz, it will make up for the inherent shortcomings.

In addition, the full play of the processor capabilities also requires the corresponding optimization of the Android system and application software. The miui used by mobile phone will make more adaptation to this processor, more extraction of wasted processor resources.

key design is also different from other Android phones. There are only home, menu, and return buttons at the bottom of the screen, dropping the search key and adding a new definition of the key to the right of the phone.

This Mi key supports custom functions. In addition to setting the return key, power key, and media key, you can also set the MI key as needed.

In the Camera mode, press the MI key to focus on and take photos. In non-Camera mode, there are three categories: one is to return to the desktop, and the other two are quick switches and applications.ProgramFor example, if you select the switch function and set it to a flashlight, you can press the rice key to turn on the flashlight for use. In the application, you can open the application with one click. This design can meet the needs of different users, assign the most common functions to the MI key.

In the future, more functions will be provided for the MI chat. For example, you can press the MI key in the MI chat to start recording directly.

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