What is the role of a coprocessor on a mobile phone? What does an apple coprocessor do?

Coprocessor, a chip that is used to relieve a system microprocessor of a specific processing task. A coprocessor, a processor that is developed and applied to assist a central processor in performing processing tasks that it cannot perform or perform efficiently and inefficiently. There are many tasks that the central processor cannot perform, such as signal transmission between devices, management of access devices, etc., and graphics processing, audio processing, and the like are the execution efficiency and the effect is low. In order to perform these processes, various auxiliary processors were born. It should be noted that since the integer arithmetic unit and the floating-point arithmetic unit have been integrated together in the current computer, the floating-point processor is no longer an auxiliary processor. The coprocessor built into the CPU is also not a secondary processor unless it is independent.

The internal structure of the coprocessor 80x87 is shown in the figure. It can be divided into two main parts: Control Unit (CU) and Numerical Execution Unit (NEU).

The control unit (CU) connects the coprocessor to the CPU's system bus, and both the coprocessor and the CPU monitor the instruction stream being executed. If the current instruction to be executed is a coprocessor instruction (ie, an ESCape instruction), the coprocessor will execute it automatically, otherwise the instruction will be passed to the CPU for execution.

The Numeric Execution Unit (NEU) copies all of the coprocessor instructions. It has a stack of eight 80-bit registers that are used to store the operands and operations of mathematical instructions in an extended-precision floating-point data format. result. During execution of a coprocessor instruction, either the data in the stack register is specified, or a push/push mechanism is used to store or read data from the top of the stack.

In the NEU component, there are also some registers that record the coprocessor's working status, such as status registers, control registers, flag registers, and exception pointer registers.

Internal structure of coprocessor 80x87

Coprocessor, a chip that is used to relieve a system microprocessor of a specific processing task. The coprocessor on mobile phones starts with the 5S M7 coprocessor. The main function of this chip is to monitor the dynamic data from accelerometers, gyroscopes, compasses, etc. to reduce the load on the CPU and extend the battery life. .

The center processing unit (abbreviated as CPU) is a core part of a mobile phone. The microprocessor in a mobile phone is similar to a central processing unit (CPU) in a computer. It is the control center system of the entire mobile phone and is also the control core of the logic part. The microprocessor achieves the overall monitoring of the mobile phone by running the software in the memory and calling the database in the memory. All the data to be processed must be completed by the CPU. The management of all parts of the mobile phone is inseparable from the unified and coordinated command of the headquarters of the microprocessor. With the continuous improvement of the production technology and technology level of integrated circuits, the functions of microprocessors in mobile phones are becoming more and more powerful, such as the integration of advanced digital signal processors (DSPs) in microprocessors. The performance of the processor determines the performance of the entire handset.

The M8 coprocessor continuously measures data from the accelerometer, compass, gyroscope, and new barometer, sharing more workload for the A8 chip, which improves performance. Not only that, these sensors now have more features, such as measuring the number of walking steps, distances, and altitude changes.

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