What are the basic rules for choosing ARM processor chips?

According to the actual needs of the project, consider the cost and power consumption, as well as the interface of the module. You can refer to the development board of Guangzhou Stowe.

Now the most used should still be Samsung's S3C2440, there is a lot of information, many routines, and resources should be enough.

Usage, power consumption, whether to use an operating system, which interfaces need to be integrated, etc.

Quality, Brand, Use, Price, etc.

According to your own understanding, talk about how to choose the type and series of ARM microprocessors in practical applications?

Dear --- In view of the many advantages of ARM microprocessors, with the gradual development of embedded applications at home and abroad, ARM microprocessors are bound to receive extensive attention and applications. However, because ARM microprocessors have as many as a dozen core structures, 10 chip manufacturers, and ever-changing internal function configuration combinations, it is very difficult for developers to choose solutions, so it is very important to do some comparative research on ARM chips.

The purpose of this blog is to sort out some concepts about ARM and ARM chips, such as what S3C2440 is, and what is its relationship with ARM.

ARM mainly designs the ARM series AISC processor cores, which do not produce chips, but only provide IP cores. Let's start with an example to explain the architecture, cores, processors, and chips: the S3C2440, which is an SoC chip.

Note that it is not a CPU, 2440 is a bit similar to the 51 microcontroller we are familiar with, both belong to the embedded. The development of embedded has gone through three stages, namely SCM, MCU, SCM or MCU, and 2440 belongs to SOC. Below is the internal structure of 2440.

The arm920t in the middle is the 2440 processor, and the processor and core are a concept here in my opinion, but one is a hard concept and the other is a soft concept. The 920T here is both a processor and a core. And what Samsung does is something other than this CPU.

That is to say, Arm gave Samsung ARM920T, and Samsung designed the S3C2440 chip based on this processor.

Now let's talk about the ARM architecture, the architecture is actually a design idea, based on which the ARM company has designed different processors, please see this table below.

So we can see that the architecture of S3C2440 is armv4.

For example, the S3C2440 is based on the ARM920T core.

To sum up: a single rack-acre base corresponds to multiple cores, and a single core corresponds to multiple chips, and Arm provides cores to chip manufacturers, such as Samsung.

5.What are the series of ArmCortex processors and what are their characteristics?

Hello, I am a teacher who is good at Chinese studies, literature and history, military, social, emotional, family, communication, digital and other aspects of problem analysis. I'm glad to serve you in the state! After the classic processor ARM11, ARM's products were renamed Cortex and divided into three categories: A, R and M, aiming to serve a variety of different markets; To put it simply, Cortex is the name of a series of processors from Arm.

For example, Intel's processors include Core, Pentium, and Celeron. ARM was named with numbers in the initial processor models, the last one was the ARM11 series, and after the application of the ARMV7 architecture, the Cortex series was launched, and the old ones were named the Classic series; [Features]: High performance]:

Fast processing power combined with high clock frequency; Real-time]: The processing power meets the hard real-time limit in all field song rounds; Secure]: A reliable and trustworthy system with high fault tolerance; Affordable]:

Features for optimal performance, power consumption, and area; The ARM Cortex-M processor family is a family of upward-compatible, energy-efficient, easy-to-use processors designed to help developers meet the needs of tomorrow's embedded applications. These needs include more functionality at a lower cost, increasing connectivity, improving reuse, and increasing energy efficiency; The Cortex-M series is optimized for cost- and power-sensitive MCUs and mixed-signal devices for end-use applications such as smart measurement, human-machine interface devices, automotive and industrial control systems, large home appliances, consumer products, and medical devices;

Answer] Compared with other processor cores, the main features of the :d ARM core are: power consumption, strong function, low cost, etc

16-bit THUMB coexists with 32-bit ARM and THUMB-2 dual command silver destruction set, and has a very large number of partners, which has a wide range of applications. Due to the RISC architecture, ARM has technical features such as single co-mode cycle operation, loading storage instructions to access memory, and instruction pipeline technology. Therefore, D is selected for this question.

Answer]: A big-end mode means that the high bit of the data is stored in the low address of the memory, and the low bit of the data is stored in the high address of the memory; The small-endian mode Bishanyou means that the master of the data is stored in the high address of the memory, and the low bit of the data is saved in the low address of the memory; The ARM processor supports THUMB (16-bit) and ARM (32-bit) dual instruction sets, which can be well compatible with 8-bit and 16-bit devices; The MPU is the memory protection unit of the ARM processor, and the MMU is the memory management unit of the ARM processor. Therefore, A is selected for this question.

Answer]: AMMU is the abbreviation of memory management unit, the Chinese name is memory management single Xianfeng Huaiyuan, which is used to manage virtual memory, physical memory brother and friend control line, but also responsible for virtual address mapping to physical address, and provide hardware mechanism memory access authorization. Therefore, options B and C are incorrect.

The nested vector interrupt controller abbreviation is NVIC, and the D option is rotten wrong. Therefore, A is selected for this question.