Are ARM9 and ARM11 Compatible

The first generation of Apple's iPhone is already ARM11. The latest iPhone 4 adopts arm cortex A8 architecture. What are the main applications of ARM9? GPS navigation, do you have to be a navigator? With the continuous improvement of people's requirements for electronic products, how long can ARM9 be used as a navigator? Moreover, as a technical developer, we should constantly add new knowledge, and ARM11 remains 100% downward compatible. It is not a problem to learn ARM11 and do ARM9. Do we have to wait until the day when ARM9 is completely eliminated to add new knowledge? However, the laboratory nature of ARM9 platform seriously affects their access to real embedded enterprises. As the mainstream arm standard of laboratory platform, arm 9 has been used for more than 6 years. At present, the arm standard used in the company is more than ARM11, that is to say, ARM9 is popular in laboratories and low-end embedded devices. The experience of ARM9 in the resume is easy to be questioned by the employer. So we use the ARM11 standard. At present, many companies stay away from the candidate 2410 2440's working experience in arm. At present, embedded training companies are using 2410 or 2440 as a learning platform, so the quality of finding a job using 2410 2440 is very poor. The ARM11 platform is a more complex platform. Most training companies do not have such strength to tell students about such platform technology, so they say that 2140 and 2440 are better for novices. There are 2440 and 2410 mainstream chips in ARM9, but why do you choose to learn more complex 2440 instead of 2410? After learning ARM11 and ARM9, the development of ARM9 is even easier. In terms of salary, mastering more cutting-edge technology will bring greater economic income

The kernel cannot determine whether the hardware is universal. ARM9 and ARM11 are two different CPU kernel architectures. The main difference is that the instruction set is different. As for hardware transplantation, it does not depend on the two cores, but on the specific CPU model you choose. Arm company authorizes the core to major semiconductor manufacturers to design CPUs, and the CPUs designed by each manufacturer do not want to be the same. See if their CPUs have similar controller interfaces. Usually, the hardware is changed. It is estimated that the problem is not very big. The main reason is that the software is incompatible. The software changes will be relatively large, mainly in the hardware driver of the system.

Both ARM9 and ARM11 are processor cores. What the specific peripherals look like depends on what different chip manufacturers do. Some peripherals are basically the same, such as USB, and some are very different, such as network.

ARM core refers to the most important part of CPU, including arithmetic unit, controller and memory. It is the core of CPU. The traditional naming of ARM processor is arm number: ARM7, ARM9 and ARM11. After ARM11, arm company uses a new naming method: cortex. Compared with the traditional method, it should be arm12.

Usually people talk about CPU, including the kernel and some peripherals. These peripherals complete certain functions. The CPU peripherals used in different environments vary greatly.

For example, Pentium, Celeron and AMD for your computer

ARM core has the first market share in embedded devices such as mobile phones.

ARM11, of which 11 is the number of ARM kernel, similar to Pentium II and Pentium III.

The ARM kernel ranges from low-end ARM7 to ARM9, ARM11, to the current high-end cotex series, and so on.

Each series is divided into many models, such as arm1176, cotrex-a8 and cotex-a9

ARM920T is a model of ARM9 Series CPU. T means that this CPU supports thumb instructions.

ARM9 can run to more than 400 megabytes and ARM11 can run to more than 600 megabytes.

The new arm cotex can run more than 1G

Are ARM9 and ARM11 Compatible 1

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